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Littérature scientifique sur le sujet « Dilatometri »

Auteur : Grafiati

Publié le 10 mars 2023

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Articles de revues sur le sujet "Dilatometri"

Pawłowski, B., P. Bała et R. Dziurka. « Improper Interpretation of Dilatometric Data for Cooling Transformation in Steels ». Archives of Metallurgy and Materials 59, n^o 3 (28 octobre 2014) : 1159–61. http://dx.doi.org/10.2478/amm-2014-0202.

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Abstract Dilatometry is the most commonly method of producing CCT diagrams and analyzing phase transformations during cooling (as well as transformations during heating) and it permits the real-time monitoring of the extent of reaction in terms of dimensional changes due to phase transformation. All modern dilatometers are fitted with computerised systems which collect dimensional change signals versus temperature to plot a dilatometric curve and also to calculate and plot the derivative of the relative dimensional change with respect to temperature. Unfortunately, elaborated by dilatometers manufacturers software, in many cases could lead to wrong interpretation of phase transformations during cooling.

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Zachreini, Indra, Mulyati Sri Rahayu, Harvina Sawitri et Fachraniah Fachraniah. « UJI BANDING EFEKTIVITAS H2O2 3%, DAN LARUTAN CAMPURAN H2O2 3% DAN MADU 1:1 SEBAGAI SERUMINOLITIK SECARA DILATOMETRI ». AVERROUS : Jurnal Kedokteran dan Kesehatan Malikussaleh 2, n^o 2 (16 février 2018) : 82. http://dx.doi.org/10.29103/averrous.v2i2.427.

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Serumen adalah campuran material sebasea dan sekresi apokrin dari kelenjar seruminosa yang bersatu dengan epitel deskuamasi dan rambut.Menurut data World Health Organizationtahun 2007, insidensi serumen obsturan di Indonesia sebesar 13% dan menempati urutan kedua terbanyak di Asia Tenggara.Serumen obsturan tipe kering dan keras, memerlukan seruminolitik sebelum dilakukan tindakan ekstraksi.Terdapat 2 jenis serumenolitik yaitu solutio aqueos dan solutio organic. Penelitian ini bersifat eksperimental dengan mengukur kerapatan massaserumen menggunakan metode dilatometri pada serumen yang dilarutkan dengan H2O2 3%, dan larutan campuran H2O2 3% dan madu perbandingan 1:1. Dilakukan analisa kerapatan massa serumen berdasarkan perbandingan massa serumen per volume serumen dalam masing-masing larutan. Hasil penelitian diperoleh, larutan campuran H2O2 3% dan madu dengan perbandingan 1:1mempunyai kerapatan massa serumen lebih rendah dibanding larutan H2O2 3% sebagai serumenolitik , namun secara statistik tidak terdapat perbedaan bermakna kerapatan massa serumen antara larutan H2O2 3% dengan larutan campuran H2O2 3% dan madu perbandingan 1:1.

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Břuska, M., J. Beňo, M. Cagala et V. Jasinková. « Dilatometric Characterization of Foundry Sands ». Archives of Foundry Engineering 12, n^o 2 (1 avril 2012) : 9–14. http://dx.doi.org/10.2478/v10266-012-0027-8.

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Dilatometric Characterization of Foundry Sands The goal of this contribution is summary of physical - chemistry properties of usually used foundry silica and no - silica sands in Czech foundries. With the help of dilatometry analysis theoretical assumptions of influence of grain shape and size on dilatation value of sands were confirmed. Determined was the possibility of dilatometry analysis employment for preparing special (hybrid) sands with lower and/or more linear character of dilatation.

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Lebedeva, N. V., Yu M. Markova, A. I. Ziza et D. M. Anisimov. « STUDY OF THE MICROSTRUCTURE OF MARTENSITE-BAINITE STEELS AND NICKEL ALLOYS WHEN MODELING HEAT TREATMENT MODES USING A DILATOMETRIC METHOD ». Industrial laboratory. Diagnostics of materials 85, n^o 6 (10 juillet 2019) : 30–36. http://dx.doi.org/10.26896/1028-6861-2019-85-6-30-36.

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We present the results obtained using the equipment available at the Center for collective use “Composition, structure, properties of structural and functional alloys” NRC “Kurchatov Institute” — CRISM “Prometey”: DIL 805A/D (TA Instruments) and DIL 402C (Netzsch) dilatometers. Dilatometric analysis which provides determination of the temperature coefficient of linear expansion and the temperature of phase transitions, as well as evaluation of the transformation kinetics, can also allow simulation of heat treatment modes to identify the size of the former austenitic grain using vacuum etching and conduct the research aimed at improving the technology of thermal and thermomechanical processing (TMO) of steels and alloys. The experiments were carried out both in vacuum and in dynamic helium atmosphere. The main methodological difficulties that we have faced with are described. For steels of martensite and martensite-bainite class (38KhMA, 38KhN3MFA, 20Kh3NMFA) conditions of vacuum etching in the chamber of the dilatometer are specified. The efficiency of the method for martensite-bainite steels in determination of the grain size compared to traditional methods of etching is deminstrated. The effect of thermodeformation parameters on the size of austenitic grain is estimated. When modeling the heat treatment modes by the dilatometric method, the microstructure of KhN55MVTs nickel alloy was also analyzed. Changes in the size and morphology of the grain structure at different stages of heat treatment are revealed. The obtained results were used to adjust the current modes of heat treatment and obtain a uniform fine-grained structure. The combined application of dilatometric and metallographic analyzes after vacuum etching of the material decreases the production costs attributed to obtaining the desired microstructure upon thermal and thermomechanical processing of the products and blanks.

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Chen, Peng, Yun Bo Xu, Xiao Long Yang, Hong Liang Yi et Guo Dong Wang. « Isothermal Bainite Transformation in Aluminium Bearing TRIP Steel ». Materials Science Forum 749 (mars 2013) : 237–42. http://dx.doi.org/10.4028/www.scientific.net/msf.749.237.

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In this work, the bainite transformation during isothermality of aluminium bearing TRIP steel was studied by dilatometric experiment on a pushrod Formastor-F highspeed dilatometer with radio frequency induction heating. The aluminium bearing TRIP steel consisted of the microstructure of austenite, ferrite and bainite in the form of laths which produced by intercritical annealing and isothermal transformation followed by rapid cooling. The effect of intercritical annealing temperature and isothermal transformation temperature were studied by dilatometric experiment and JEOL JXA-8530F Electron Probe Microscopic Analyzer (EPMA).

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Neumeier, J. J., et Genevieve A. Nelson. « Sapphire dilatometer cell for measuring the thermal expansion of solids ». Review of Scientific Instruments 93, n^o 6 (1 juin 2022) : 063903. http://dx.doi.org/10.1063/5.0091377.

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Capacitive-based dilatometry is used to determine the thermal expansion of solid specimens over a broad temperature range and for the study of structural and thermodynamic phase transitions. It can detect length changes of 0.1 Å or better. Dilatometer cells have been constructed of metals, such as copper or silver, and non-metals, such as silicon and fused silica. Sapphire is a good candidate for the construction of a dilatometer cell. It has excellent thermal conductivity, a well-behaved thermal expansion of moderate magnitude, especially below ∼60 K, and is readily available. The design, fabrication, and testing of a sapphire dilatometer cell are described herein.

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Matjeke, Velaphi Jeffrey, Josias Willem van der Merwe et Nontuthuzelo Lindokuhle Vithi. « Determination of Critical Transformation Temperatures for the Optimisation of Spring Steel Heat Treatment Processes ». Metals 11, n^o 7 (24 juin 2021) : 1014. http://dx.doi.org/10.3390/met11071014.

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Bogie spring performance can be improved by using the exact heat treatment process parameters. The purpose of the study is to determine the critical transformation temperatures and investigate the effect of the cooling rates on microstructural and mechanical properties. The precise determination of the required cooling rates for the particular grade of steel is important in order to optimise the heat treatment process of heavy-duty compression helical spring manufacturing. A traditional heat treatment system for the manufacture of hot coiled springs requires heating the steel to homogenize austenite; then, it is decomposed to martensite by rapid cooling. By analyzing the transition properties by heating and differing cooling rates, this analysis examines the thermal behaviour of high strength spring steel. Using the dilatometer and differential scanning calorimeter, scanning electron microscope, optical microscope, and hardness checking, critical transition temperatures and cooling rates of three springs steels were measured. Although the thermal transformation of materials has been researched for decades using dilatometers, not all materials have been characterized. The research offers insights into the critical transformation temperatures for the defined grades of spring steel and the role of cooling rates in the material’s properties. Mechanical properties are influenced by the transition data obtained from the dilatometric analysis.

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Drozd, Zdeněk, Zuzanka Trojanová et Pavel Lukáč. « Experimental Study on the Relation between Elastic and Thermal Deformation of the AZ31 Magnesium Alloy and Composite ». Key Engineering Materials 465 (janvier 2011) : 423–26. http://dx.doi.org/10.4028/www.scientific.net/kem.465.423.

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The dilatation characteristics of the continuosly cast AZ31 alloy and composite with AZ31 matrix reinforced by SiC nanoparticles were investigated in the temperature range of 20-410 °C. The axis of specimens was either parallel or perpendicular to the casting texture. The linear thermal expansion of the alloy as well as the composite was measured in an argon protective atmosphere using a Netzsch 410 dilatometer. The relative elongation and coefficient of thermal expansion are the main experimental results obtained using dilatometry. The temperature dependence of the elastic modulus can be calculated using analysis of the dilatometry results.

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Maca, K., V. Pouchly et A. R. Boccaccini. « Sintering densification curve : A practical approach for its construction from dilatometric shrinkage data ». Science of Sintering 40, n^o 2 (2008) : 117–22. http://dx.doi.org/10.2298/sos0802117m.

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This article summarizes the usage of high-temperature dilatometry in ceramic processing and powder technology with special attention on the description of the sintering process. A practical method for transformation of dilatometric shrinkage data into densification curves (the dependence of the sample density on sintering temperature or time) is described in detail. A new automatic procedure to recalculate sintering shrinkage data allowing the plot of the densification curve has been developed, which is presented here.

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Kövér, Michal, et Peter Sláma. « Aluminium Alloys Measurement in Quenching Dilatometer and Application of the Data ». Advanced Materials Research 1127 (octobre 2015) : 73–77. http://dx.doi.org/10.4028/www.scientific.net/amr.1127.73.

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Thermal expansion is an important material property. From change of this quantity phase transformations can be evaluated. Therefore dilatometry is a common tool for construction of transformation diagrams in steel and prediction of material structure according to the performed heat treatment. However there are some restrictions for quenching dilatometers, such as magnetic properties of the material or weldability of the controlling and measuring thermocouple. In this article the quenching dilatometry is proposed for evaluation of precipitation during continuous cooling from solution annealing temperature. Aluminium alloy EN AW 6082 was chosen as the experimental material. Due to poor weldability of the experimental material new sample geometry was introduced.

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Thèses sur le sujet "Dilatometri"

Errico, Antonio. « Deformazioni del suolo in aree vulcaniche : applicazioni ai Campi Flegrei e a Stromboli ». Doctoral thesis, Universita degli studi di Salerno, 2013. http://hdl.handle.net/10556/885.

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2011 - 2012
Nella notte tra il 24 e 25 agosto del 79 d.C. villaggi e città vennero distrutti e migliaia di persone persero la vita per l' improvvisa eruzione del Vesuvio. Le rovine di Pompei ed Ercolano, sepolte e conservate dai prodotti di quell' eruzione, ci mostrano una istantanea della vita di duemila anni fa ma ci portano anche ad immaginare quale ansia e quale terrore abbiano provato le persone in quel momento. Ancora oggi le eruzioni vulcaniche provocano morte e distruzione in tutto il pianeta ma, rispetto agli inizi del primo millennio tanto è stato fatto per capire il meccanismo che regola questi eventi catastro ci. L' obiettivo dei geo sici è quello di prevedere eventuali eruzioni vulcaniche attraverso lo studio di segnali premonitori, se ce ne sono. A questo scopo negli anni tra il 2004 e il 2006 è stata istallata una rete di dilatometri nei Campi Flegrei, sul Vesuvio e sull' isola di Stromboli, mentre nel periodo 2008-2009 nei Campi Flegrei è stata istallata una rete di inclinometri a base lunga. L' obiettivo di questa tesi è lo studio delle deformazioni lente del suolo come e etto dell' intrusione di magma all' interno della camera magmatica dei Campi Flegrei ed una analisi statistica degli sciami di esplosioni che si veri cano sull' isola di Stromboli. Nel prosieguo del lavoro è stata data una descrizione dei dilatometri da pozzo di tipo Sacks-Evertson e degli inclinometri a base lunga. L' utilizzo di questi strumenti segue il modello del campo delle deformazioni nel range delle basse frequenze monitorando il tensore delle deformazioni nelle sue componenti non diagonali, per le inclinazioni pure (inclinometri) e le sue componenti diagonali, per le deformazioni (dilatometri). E' stato dato un largo spazio ai fenomeni che regolano le deformazioni della crosta terrestre facendo un' ampia digressione sulla teoria dell' elasticità e sulla teoria che regola le maree. E' stata fatta, inoltre, una analisi statistica degli sciami di esplosioni del vulcano Stromboli in tre periodi distinti usando i dati registrati da sismometri di tipo Lennartz e Guralp. Successivamente è stato fatto un confronto tra questi dati sismici con i dati dilatometrici registrati da un dilatometro, anch' esso di tipo Sacks-Evertson, istallato sull' isola di Stromboli. [a cura dell'autore]
XI n.s.

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Pouchlý, Václav. « Slinování pokročilých keramických materiálů s využitím vysokoteplotní dilatometrie ». Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228398.

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This diploma work is focused on exploitation of high-temperature dilatometry in sintering of advanced ceramic materials. Newly developed software is presented in this diploma work. This software is able to calculate activation energy of sintering process via concept of Master Sintering Curve. In the second part of diploma work the software was verified by evaluation of sintering of four different ceramics materials. The following activation energies of sintering were calculated: 990kJ/mol for tetragonal ZrO2 (3mol% Y2O3), 620kJ/mol for cubic ZrO2 (8mol% Y2O3) and 640kJ/mol resp. 720kJ for Al2O3 with two different particle size.

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Matsubara, Daniel Bojikian. « Caracterização de chapa grossa de aço microligado temperado por meio da técnica de dilatometria ». Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-23102015-155738/.

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Foram coletadas amostras de uma chapa grossa temperada, de aço microligado ao boro com 8 mm de espessura. O aço foi produzido em aciaria do tipo LD, laminado na forma de chapa grossa em laminador de cadeira única reversível e finalmente recebeu tratamento de têmpera em forno de tubos radiantes e máquina de têmpera com fluxo de água. Todas as etapas de produção tiveram os parâmetros de processo controlados para obtenção das melhores propriedades possíveis. As amostras foram retiradas da região situada a um quarto da largura da chapa e submetidas a diversos ciclos térmicos em aparelho de dilatometria. Com auxílio de técnicas de microscopia ótica, microscopia eletrônica de varredura e medidas de dureza, o aço pôde ser caracterizado e foi possível levantar as curvas de resfriamento contínuo (TRC). As microestruturas revelaram a presença de múltiplos microconstituintes, principalmente em resfriamentos a partir de resfriamentos 25°C/s, quando surgem elementos aciculares como ferrita acicular e bainita misturados com ferrita poligonal e perlita. Acima desta taxa de resfriamento o campo perlítico é suprimido e a partir de 45°C/s surge a martensita. A 100°C/s a microestrutura é dominada predominantemente por martensita. As amostras resfriadas nas 3 taxas mais severas também revelaram a presença de austenita retida e constituinte MA, detectados por meio de difração de raios-x e ataque com reagente de Klemm.
Samples were taken from a quenched plate with 8mm thickness and chemical composition consisting of carbon, manganese, silicon, aluminum, niobium, titanium and boron. The steel was produced in LD converter, rolled in a reversible single chair rolling mill and quenched in a radiating tube furnace and quenching machine with water flow. All production stages had the process parameters controlled to obtain the best possible properties. The samples were extracted from a position situated at one quarter of the plate´s width and submitted to various thermal cycles in dilatometry device. With the aid of optical microscopy, scanning electron microscopy and hardness measurements, the steel could be characterized and the continuous cooling transformation curves could (CCT) be plotted. The microstructures revealed the presence of multiple components, especially when cooling rates reach 25°C/s, where acicular elements, like acicular ferrite and bainite, are found along with polygonal ferrite and pearlite. Above this cooling rate the pearlite field is suppressed and starting at 45°C/s martensite was found. At 100°C/s the microstructure is mainly martensitic. The samples cooled at the 3 most severe rates also revealed the presence of retained austenite and MA constituent, which were detected by x-ray diffraction and attack using Klemm reagent.

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Pouchlý, Václav. « Slinování pokročilých keramických materiálů ». Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-234142.

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Sintering is a one of the key step in a processing of bulk ceramic materials. New sintering methods were invented in the last years. These new sintering methods, according to their authors, can be used for obtaining finer final microstructure of ceramics only by modifying the heating schedule. This work is focused on an influence of the Two Step Sintering method on the final microstructure for oxide ceramics. Obtained experimental results have shown that the effectivity of the Two Step Sintering method is rising with crystallographic symmetry of used material. Thesis is also focused on a high-temperature dilatometry and concept of the Master Sintering Curve. This concept was used for calculation of the activation energy of sintering and finding different sintering mechanisms acting in the intermediate and final stage of sintering. Activation energy of sintering was compared with activation energy of grain growth with target to find the kinetic window. Kinetic window can allow a sintering without a grain growth. Master Sintering Curve method was also used in a pressure assisted unconventional sintering technique Spark Plasma Sintering. Master Sintering Curve applied to a Spark Plasma Sintering technique reveals and quantified different sintering mechanisms acting in Spark Plasma Sintering. These findings led to preparation of transparent tetragonal ZrO2.

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Mařák, Vojtěch. « Příprava a vlastnosti dopovaných piezokeramických materiálů na bázi BaTiO3 ». Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417065.

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This diploma thesis deals with the preparation of doped piezoceramic materials based on BaTiO3 using electrophoretic deposition. Five rare earth oxides, i.e. Er2O3, Dy2O3, Eu2O3, Tb407 and CeO2, were used as dopants in amounts of 1, 3, and 5 wt. %. The prepared deposits were evaluated in terms of preparation methodology, high temperature dilatometry, X-ray diffraction analysis, relative density, mean grain size, hardness and fractographic analysis. The study of dilatometric curves described the sintering behavior and its changes at different material compositions. X-ray diffraction analysis revealed a tetragonal phase in all samples; the tetragonality of the BaTiO3 crystalline cell decreased with dopant content. By a suitable choice of dopant, it was possible to significantly increase the relative density of sintered samples, their hardness and at the same time prevent the samples from coarsening of the microstructure during heat treatment. A relative density up to 98 %, a mean grain size below 1 m and a hardness of over 10 GPa were achieved. Analysis of the fracture surfaces revealed that the fracture mode was transcrystalline for the most of studied materials; only the samples doped with cerium dioxide had fracture surfaces with both transcrystalline and intercrystalline fracture modes. Based on the obtained results, a suitable composition of the material for the intended use in a layered piezoceramic harvester was identified, which, in addition to the BaTiO3 layers, consists of functionally-protective Al2O3 and ZrO2 layers.

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Casarin, Samuel Jose. « Caracterização da temperabilidade de um aço C-Mn microligado ao boro, através de dilatometria e curvas de transformações de fases por resfriamento contínuo ». Universidade de São Paulo, 1996. http://www.teses.usp.br/teses/disponiveis/88/88131/tde-29012010-160947/.

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No presente trabalho, foi realizado um estudo sobre a influência da adição do boro em um aço C-Mn, nas transformações de fases por resfriamento contínuo, através da técnica dilatométrica. Para este estudo, utilizou-se dois aços de composição química semelhante: o aço 10B22 com 30 ppm de boro e o aço sem boro é o E1522, equivalente. Foram traçadas as curvas de CCT dos dois aços, onde analisou-se o efeito de temperabilidade do boro através das curvas de resfriamento. Os materiais foram ensaiados em um dilatômetro de resfriamento rápido, utilizando corpos de prova cilíndricos, resfriados por injeção de ar e hélio. Os resultados gráficos dos processos de resfriamento foram comparados com análises metalográficas ótica estruturais e quantitativas e também por medidas de dureza. Detalhes microestruturais, tais como, contagem de fases formadas em função das taxas de resfriamento, tamanho de grão, distribuição de inclusões e precipitados, foram extraídos, através de um sistema de análise de imagens. Complementando o trabalho, foi realizado uma completa documentação fotográfica das microestruturas, com uma indicação final do tratamento térmico mais adequado aos aços C-Mn microligados ao boro.
This work presents a study about the influence of boron on phase transformation by continuous cooling in a C-Mn steel using the dilatometric technique. For this study two close chemical composition steels were applied: a 10B2 steel with 30 ppm of boron and a E1522 steel without boron. For both steels the CCT curves were obtained, where the effect of boron on hardenability was analysed throughout continuous cooling curves. Both materials were testedcin a high speed quenching dilatometer, using cilindricals samples quenched by helium blow on their surfaces. The graphics results of cooling processes were compared with microstructural and quantitative optical metallographic analysis and hardness measurements. Microstructural features as such phases fraction as a function of cooling rates, grain size, and distributions of inclusions and precipitates were obtained through an image analysis system. In addition, complete microstructural photography documentation was carried out where it was possible to indicate the best heat treatment to boron microalloyed C-Mn steels.

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Casarin, Samuel José. « Transformações de fases isotérmicas por dilatometria do aço SAE 1070 : curva TTT ». Universidade de São Paulo, 1993. http://www.teses.usp.br/teses/disponiveis/18/18136/tde-16092009-093825/.

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A proposta de desenvolvimento deste trabalho de dissertação veio de encontro com o objetivo de adaptar um laboratório para pesquisas em transformações de fases, utilizando o método dilatométrico, onde foram estudadas as reações no estado sólido que sofrem os materiais submetidos a ciclos térmicos. Para atingir este objetivo, instalou-se recentemente um dilatômetro de resfriamento rápido, modelo DT 1000 da Adamel Lhomargy. Completada a etapa de instalação do equipamento, o passo seguinte consistiu em explorar, através de ciclos térmicos variados, todos os recursos manipuláveis do dilatômetro. Aplicando a técnica dilatometrica em um aço de características termomecânicas conhecidas - SAE 1070 - possibilitou-se, a partir deste trabalho, que pesquisas mais complexas pudessem ser executadas com tal equipamento ou que o mesmo servisse como um instrumento complementar para estudos de transformações de fases. Nessa fase inicial de investigações estudou-se as curvas dilatométricas a fim de verificar os tempos de início e fim de transformação isotérmica em várias temperaturas de decomposição da austenita. Traçou-se as curvas de transformação isotérmica - curvas TTT - para o aço ensaiado (tratado termicamente), onde analisou-se a influência desse tratamento térmico prévio (recozimento) sobre a transformação \'alfa\' para \'gama\'. Finalizando a parte prática deste trabalho, comprovou-se as transformações de fases isotérmicas nas várias temperaturas ensaiadas, através de análise metalográfica e de medidas de microdureza dos produtos obtidos. A fim de solucionar eventuais problemas relacionados ao manuseio e manutenção do equipamento, com base na experiência adquirida ao longo do desenvolvimento deste trabalho, são dadas sugestões de possíveis aplicações do dilatômetro de têmpera rápida DT 1000 em pesquisas de transformações de fases.
The purpose of this work comes together with the objective to adapt a phase transformation research laboratory using dilatometric method, where it will be possible to study the solid state reactions of materials submited to thermal cycles. To fulfil this purpose, it was installed a high speed quenching dilatometer, model DT 1000 manufactured by Adamel Lhomargy. After this stage, our next step was to explorer all equipment resources through variable thermal cycles. Appling dilatometric method to a well known thermomechanical steel - SAE 1070 - it becomes possible the accomplishment of more complex experiments with this equipment. This equipment, itself, may be a powerfull auxilliary instrument to phase transformations studies. In this first investigation, it was studied the dilatometric curves to find the beginning and the end times of isothermal phase transformation for several austenite decomposition temperatures - TTT diagram - for the tested steel (thermal treated). The effect of this previous heat treatment (annealing) on the \'alfa\' for \'gama\' transformation were observed. Finally, the isothermal phase transformation at the different tested temperatures could be confirmed through metallographic and microhardness analysis. In order to solve possible problems associated to the equipment use or maintenance, some suggestions of applications of the high speed quenching dilatometer are indicated for further works.

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Solem, Benjamin. « Dilatometry Study of a High-Chromium Cast Iron ». Thesis, KTH, Hållfasthetslära (Avd.), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-232528.

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High-chromium cast irons are used in certain applications where the demand on abrasion resistance is high. Such applications can be found in the milling industry and in pumps for transport of abrasive particles in liquid suspension. Soft annealed high-chromium cast iron containing 2.6 % C and 24.7 % Cr was supplied by Xylem Water Solutions, Sundbyberg, and investigated by dilatometry. The heat treatments were inspired by induction hardening procedures. The purpose of the investigation was to evaluate the effect of maximum temperature reached during heat treatment on the final length of the test specimen. The aim with this was to find the treatment yielding the maximum possible length which should be profitable to create desirable compressive stresses in the surface hardened area. The experimental results were used to create a finite element model in COMSOL Multiphysics accommodating for the maximum temperature, simulating the phase changes occurring in a geometry based on the experimental test specimen. The experimental results did not reveal any clear correlation between the maximum temperature and the final length change. The hardness, however, increased with the increasing temperature in the treatment interval 900-1150 °C. The, by light optical microscopy, observed amount of secondary precipitated carbides decreased with increasing temperature. Martensite transformation was also affected; the transformation temperature decreased for increased treatment temperatures. From dilatometry it was also seen that the thermal strains were greatly affected by the direction of which the material was cut from the original cast material. Samples taken perpendicular to the mainly investigated direction showed lower coefficients of thermal expansion and the final strain was clearly positive compared to the slightly negative values found for the main direction. This phenomenon could possibly be explained by different macrostructures created during solidification of the melt causing anisotropy in the eutectic. The implementation in COMSOL by describing the phase transformation as ordinary differential equations did show partially good results in the simulation of thermal expansion. The difference in original material is noticeable in the dilatometry and the simulated martensite transformation deviates from the experimental results. The model needs to be validated against new intermediate test temperatures and the martensite transformation kinetics must be investigated further to yield better results to be able to combine the phase transformations with mechanical calculations.

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Kinkelaar, Mark Richard. « Dilatometric study of low profile unsaturated polyester resins / ». The Ohio State University, 1993. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487848078450146.

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Carvalho, Leandro Gomes de. « Estudo dilatométrico das transformações de fase em aços maraging M300 e M350 ». Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-26032012-112344/.

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Os aços maraging são aços de baixo teor de carbono com estrutura martensítica (CCC), que são endurecidos pela precipitação de fases intermetálicas. O objetivo deste trabalho é estudar as transformações de fases desses aços: precipitação, reversão da martensita para a austenita e transformação martensítica. Nesse trabalho, foram caracterizadas uma corrida de aço maraging da série 300 e três corridas da série 350, usando diversas técnicas complementares: microscopia ótica, microscopia eletrônica de varredura com análise dispersiva de energia, microdurômetro, difração de raios-X, ferritoscópio e dilatometria. Os resultados obtidos mostraram que as corridas com maiores teores de cobalto e titânio apresentaram maiores valores de microdureza nos estados solubilizado e envelhecido. Por outro lado, medidas dilatométricas mostraram que há uma influência significativa tanto da composição química, quanto da taxa de aquecimento nas reações de precipitação e reversão da martensita para a austenita. No entanto, a transformação martensítica mostrou-se dependente apenas da taxa de aquecimento.
Maraging steels are steels with a low carbon martensitic structure (BCC), which are hardened by precipitation of intermetallic phases. The aim of this work is to study the phase transformations of these steels: precipitation, martensite to austenite reversion and martensitic transformation. In this study, one cast of 300 grade and three casts of 350 grade were characterized using several complementary techniques: optical microscopy, scanning el ectron microscopy with energy dispersive analysis, microhardness, X-ray diffraction, ferritoscope and dilatometry. The results showed that the casts with higher concentrations of cobalt and titanium showed higher microhardness in the solution annealed and aged states. On the other hand, dilatometry measurements showed that there is a significant influence of both the chemical composition and the heating rate on the reactions of precipitation and reversion of martensite to austenite. However, the martensitic transformation was dependent solely on the heating rate.

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Livres sur le sujet "Dilatometri"

Snow, Arthur W. Dilatometry on thermoset resins. Arlington, VA : Office of Naval Research, 1991.

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Miller, W. Lash. Indirect analysis by means of the dilatometer. [Toronto] : University library ; pub. by the Librarian, 1995.

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Manoj, N. Design, fabrication, and operation of the LVDT based vertical dilatometer. Mumbai : Bhabha Atomic Research Centre, 2005.

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Ali, M. El Sayed. Practical application of stepwise isothermal dilatometry for characterization of sinterability of powder compacts. Roskilde : Riso National Laboratory, 1988.

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1947-, Miller Robert A., et United States. National Aeronautics and Space Administration., dir. Evaluation of oxidation damage in thermal barrier coating systems. [Washington, DC] : National Aeronautics and Space Administration, U.S. Army Research Laboratory, 1996.

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Britton, Karen Joanne. Automation of a capacitance dilatometer using distributed control. 1990.

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Determination of terminal solid solubility of hydrogen in Zr-alloy pressure tube material using dilatometry technique. Mumbai : Bhabha Atomic Research Centre, 2004.

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Borehole dilatometer installation, operation, and maintenance at sites along the San Andreas Fault, California. [Denver, Colo.?] : Dept. of the Interior, U.S. Geological Survey, 1989.

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Chapitres de livres sur le sujet "Dilatometri"

Macherauch, Eckard. « Dilatometrie ». Dans Praktikum in Werkstoffkunde, 148–50. Wiesbaden : Vieweg+Teubner Verlag, 1992. http://dx.doi.org/10.1007/978-3-663-01089-0_32.

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Macherauch, Eckard, et Hans-Werner Zoch. « Dilatometrie ». Dans Praktikum in Werkstoffkunde, 195–97. Wiesbaden : Vieweg+Teubner, 2011. http://dx.doi.org/10.1007/978-3-8348-9884-5_30.

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Macherauch, Eckard. « Dilatometrie ». Dans Praktikum in Werkstoffkunde, 148–50. Wiesbaden : Vieweg+Teubner Verlag, 1987. http://dx.doi.org/10.1007/978-3-322-86116-0_32.

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Macherauch, Eckard. « Dilatometrie ». Dans Praktikum in Werkstoffkunde, 148–50. Wiesbaden : Vieweg+Teubner Verlag, 1989. http://dx.doi.org/10.1007/978-3-663-13980-5_32.

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Macherauch, Eckard. « Dilatometrie ». Dans Praktikum in Werkstoffkunde, 148–50. Wiesbaden : Vieweg+Teubner Verlag, 1990. http://dx.doi.org/10.1007/978-3-663-14841-8_32.

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Kraftmakher, Yaakov. « Modulation Dilatometry ». Dans Modulation Calorimetry, 129–45. Berlin, Heidelberg : Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-08814-2_8.

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Macherauch, Eckard, et Hans-Werner Zoch. « V30 Dilatometrie ». Dans Praktikum in Werkstoffkunde, 243–46. Wiesbaden : Springer Fachmedien Wiesbaden, 2019. http://dx.doi.org/10.1007/978-3-658-25374-5_30.

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Macherauch, Eckard, et Hans-Werner Zoch. « V30 Dilatometrie ». Dans Praktikum in Werkstoffkunde, 243–46. Wiesbaden : Springer Fachmedien Wiesbaden, 2014. http://dx.doi.org/10.1007/978-3-658-05038-2_30.

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Gooch, Jan W. « Dilatometer ». Dans Encyclopedic Dictionary of Polymers, 224. New York, NY : Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_3691.

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Ameratunga, Jay, Nagaratnam Sivakugan et Braja M. Das. « Dilatometer Test ». Dans Developments in Geotechnical Engineering, 183–91. New Delhi : Springer India, 2015. http://dx.doi.org/10.1007/978-81-322-2629-1_7.

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Actes de conférences sur le sujet "Dilatometri"

Panas, Andrzej J., Cezary Senderowski et Bartosz Fikus. « Dilatometric Study of High Temperature Exposure Effects in Multiphase Fe-Al Intermetallic/Oxide Ceramic Coating Deposited by Gas Detonation Spraying ». Dans ITSC2019, sous la direction de F. Azarmi, K. Balani, H. Koivuluoto, Y. Lau, H. Li, K. Shinoda, F. Toma, J. Veilleux et C. Widener. ASM International, 2019. http://dx.doi.org/10.31399/asm.cp.itsc2019p0131.

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Abstract A wide range of properties can be achieved in intermetallic coatings applied by gas detonation spraying (GDS). The properties of Fe-40at%Al GDS layers, however, may change when exposed to temperatures exceeding a threshold level. To characterize such changes, Fe-40at%Al GDS coatings were subjected to systematic dilatometric studies in which temperatures were cycled from room temperature to 1180 °C. The investigation revealed both irreversible and reversible phase transitions as described in the paper. Dilatometry measurements obtained from sintered samples made from the same powder are presented for comparison.

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Banka, Andrew, Andrew Senita, Robert Goldstein, Tareq Eddir et Robert Cryderman. « Short Time Dilatometry Quench System Analyses ». Dans HT2019. ASM International, 2019. http://dx.doi.org/10.31399/asm.cp.ht2019p0136.

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Abstract Dilatometry test systems are commonly used for characterizing the transformation behavior in steels using induction heating for the heating source and gas flow for the cooling source. In these systems, the steel test article is assumed to have a uniform temperature throughout the sample. The accuracy of this assumption depends on the design of the induction heating and gas cooling systems, as well as the time scales for heating and cooling. Previous papers by the authors have shown the variations in temperature that occur during heating and cooling for a TA Instruments DIL805 dilatometer (dilatometer). Investigations were carried out for development of an improved heating/cooling system for this dilatometer using electromagnetic and thermal analyses for the induction coil and CFD analyses for the high-pressure gas cooling system. Electromagnetic analyses showed that a novel cooling system could be incorporated, though higher power would be required to maintain the same heating rate. While the improved cooling system showed promise on an idealized basis, full CFD modeling shows that the system would not provide improved cooling due to complex flow dynamics.

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Cryderman, Robert, et Finn Bamrud. « Effect of Thermomechanical Rolling of the Induction Hardenability of a Micro-Alloyed 1045 Steel ». Dans HT2021. ASM International, 2021. http://dx.doi.org/10.31399/asm.cp.ht2021p0125.

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Abstract A micro-alloyed 1045 steel was commercially rolled into 54 mm diameter bars by conventional hot rolling at 1000 °C and by lower temperature thermomechanical rolling at 800 °C. The lower rolling temperature refined the ferrite-pearlite microstructure and influenced the microstructural response to rapid heating at 200 °C·s-1, a rate that is commonly encountered during single shot induction heating for case hardening. Specimens of both materials were rapidly heated to increasing temperatures in a dilatometer to determine the Ac1 and Ac3 transformation temperatures. Microscopy was used to characterize the dissolution of ferrite and cementite. Continuous cooling transformation (CCT) diagrams were developed for rapid austenitizing temperatures 25 °C above the Ac3 determined by dilatometry. Dilatometry and microstructure evaluation along with hardness tests showed that thermomechanical rolling reduced the austenite grain size and lowered the heating temperature needed to dissolve the ferrite. With complete austenitization at 25 °C above the Ac3 there was little effect on the CCT behavior.

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Pavlíková, Milena, Adam Pivák et Zbyšek Pavlík. « High temperature dilatometric measurement of MOC ». Dans THERMOPHYSICS 2020 : 25th International Meeting. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0033842.

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DROZDOVÁ, Ľubomíra, Bedřich SMETANA, Mario MACHŮ, Svetlana SOROKINA, Simona ZLÁ, Monika KAWULOKOVÁ, Vlastimil NOVÁK et Lenka ŘEHÁČKOVÁ. « dilatometry Analysis of FeCCrNi based systems ». Dans METAL 2020. TANGER Ltd., 2020. http://dx.doi.org/10.37904/metal.2020.3445.

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Pavlíková, Milena, Adam Pivák, Karin Edel et Zbyšek Pavlík. « High temperature dilatometric measurement of Basalt ». Dans Thermophysics 2021 : 26th International Meeting of Thermophysics 2021. AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0094502.

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Luo, S., et C. Xu. « Numeric Modeling of the Flat Dilatometer Test ». Dans GeoShanghai International Conference 2006. Reston, VA : American Society of Civil Engineers, 2006. http://dx.doi.org/10.1061/40861(193)35.

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Marchetti, Silvano, Paola Monaco, Gianfranco Totani et Diego Marchetti. « In Situ Tests by Seismic Dilatometer (SDMT) ». Dans Symposium Honoring Dr. John H. Schmertmann for His Contributions to Civil Engineering at Research to Practice in Geotechnical Engineering Congress 2008. Reston, VA : American Society of Civil Engineers, 2008. http://dx.doi.org/10.1061/40962(325)7.

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Mayne, Paul W. « Lateral Drilled Shaft Response from Dilatometer Tests ». Dans GeoSupport Conference 2004. Reston, VA : American Society of Civil Engineers, 2004. http://dx.doi.org/10.1061/40713(2004)35.

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Amoroso, S. « Use Of Seismic Dilatometer For Design Infrastructures ». Dans 18th Southeast Asian Geotechnical Conference (18SEAGC) & Inaugural AGSSEA Conference (1AGSSEA). Singapore : Research Publishing Services, 2013. http://dx.doi.org/10.3850/978-981-07-4948-4_362.

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Rapports d'organisations sur le sujet "Dilatometri"

J. E. Daw, J. L. Rempe, D. L. Knudson, K. G. Condie et J. C. Crepeau. Viability of Pushrod Dilatometry Techniques for High Temperature In-Pile Measurements. Office of Scientific and Technical Information (OSTI), mars 2008. http://dx.doi.org/10.2172/926333.

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Toney, Gretchen, et Chris Jensen. Technical Guidance on Use of the Linseis Vertical Dilatometer L75. Office of Scientific and Technical Information (OSTI), avril 2022. http://dx.doi.org/10.2172/1876310.

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Ladanyi, B. Determination of Creep Properties of Frozen Soils By Means of the Borehole Dilatometer. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1991. http://dx.doi.org/10.4095/132479.

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Ladanyi, B., et P. Huneault. Use of the Borehole Dilatometer Stress - Relaxation Test For Determining the Creep Properties of Ice. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1991. http://dx.doi.org/10.4095/132480.

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Wilding, Malwina. Status of the Optical Dilatometer Method of Evaluating the Peak Irradiation Temperatures of SiC Passive Monitors. Office of Scientific and Technical Information (OSTI), septembre 2021. http://dx.doi.org/10.2172/1894499.

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Dr. Manish Metha et Dr. Tom Oakwood. Development of a Standard Methodology for the Quantitative Measurement of Steel Phase Transformation Kinetics and Dilation Strains Using Dilatometric Methods, QMST (TRP 0015). Office of Scientific and Technical Information (OSTI), avril 2004. http://dx.doi.org/10.2172/840936.

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