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Статті в журналах з теми "Carbide plate variables"
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Mannila, Marju, and Antti Häkkinen. "Influence of Hydrofluoric Acid Concentration and pH on Corrosion of Porous Multi-Oxide Engineering Ceramics." Advances in Science and Technology 64 (October 2010): 7–12. http://dx.doi.org/10.4028/www.scientific.net/ast.64.7.
Повний текст джерелаАнотація:
The object of the research was to compare the corrosion resistance of three types of multioxide technical ceramics in hydrofluoric acid containing aqueous media according to a full factorial experimental plan with pH and fluoride ion concentration as variables. The samples were a silicon carbide doped aluminum silicate material, and two membrane coated aluminum silicates with one containing a membrane on both sides of the ceramic plate. The substrates contained more additives on alumina, while the membrane coats were of higher grade aluminum oxide. The samples were shaken in containers for up to two weeks, and their remaining hardness and weight losses were measured. Daily samples drawn from the liquid phase were analyzed for dissolved components. With respect to all measured properties, fluoride concentration affected the materials more detrimentally than alterations in pH.
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Chen, Liu Ding, Xiao Yan Tong, Xiang Zheng, and Lei Jiang Yao. "Progressive Damage Approach to Simulating Low Velocity Impact Response of Plain Weave C/SiC Composites." Advanced Materials Research 118-120 (June 2010): 241–45. http://dx.doi.org/10.4028/www.scientific.net/amr.118-120.241.
Повний текст джерелаАнотація:
Based on progressive damage theory, a 3D laminated model with an orthotropic property in plane was established to simulate the response of plain weave carbon fiber reinforced silicon carbide(C/SiC) ceramic matrix composites(CMC) under low velocity impact(LVI). Intra-layer damage and inter-layer damage were taken into account, respectively. Three scalar damage variables, associated with the degradation of warp modulus, weft modulus and shear modulus, respectively, were proposed to characterize intra-layer damage evolutions. The intra-layer constitutive model was implemented into MSC.Dytran, via its user subroutine EXFAIL1. The potential delamination region was considered as a discrete cohesive zone. Three vector spring elements were placed into every two adjacent nodes to simulate the inter-layer joints. A scalar damage variables, associated with the degradation of the three vector spring elements, were brought forward to characterize the inter-layer damage evolutions. The inter-layer constitutive model was implemented into MSC.Dytran, via its user subroutine EXELAS. Damage area, indentation depth of C/SiC composite plates and time history of impact force were obtained to compare with experimental results. The numerical results show overall good agreement with experimental results.
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Canute, X., and M. C. Majumder. "Investigation of tribological and mechanical properties of aluminium boron carbide composites using response surface methodology and desirability analysis." Industrial Lubrication and Tribology 70, no. 2 (March 12, 2018): 301–15. http://dx.doi.org/10.1108/ilt-01-2017-0010.
Повний текст джерелаАнотація:
Purpose Aluminium metal matrix composites are used in automotive and aerospace industries because of their high performance and weight reduction benefits. The current investigation aims to focus on the development of the stir cast aluminium-boron carbide composites with enhanced mechanical and tribological properties. Design/methodology/approach The aluminium-boron carbide composites are produced by stir casting process. Aluminium alloy A356 is chosen as the matrix material and three sets of composites are produced with different weight fractions of boron carbide particles. Higher particle size (63 µm) of boron carbide is chosen as the reinforcement material. Aluminium-boron carbide composites are tested for mechanical and tribological properties. The effect of process parameters like load, speed and percentage of reinforcement on the wear rate are studied using the pin-on-disc method. The interaction of the process parameters with the wear rate is analysed by DesignExpert software using RSM methodology and desirability analysis. The coded levels for parameters for independent variables used in the experimental design are arranged according to the central composite design. The worn surface of the pin is examined using a scanning electron microscope. The phases and reaction products of the composites are identified by X-ray diffraction (XRD) analysis. Findings Aluminium-boron carbide composites reveal better mechanical properties compared to monolithic aluminium alloys. Mechanical properties improved with the addition of strontium-based master alloy Al10Sr. The ultimate tensile strength, hardness and compressive strength increase with an increase in the reinforcement content. The wettability of the boron carbide particles in the matrix improved with the addition of potassium flurotitanate to the melt. Uniform dispersion of particles into the alloy during melting is facilitated by the addition of magnesium. Wear resistance is optimal at 8 per cent of boron carbide with a load 20 N and sliding speed of 348 RPM. The wear rate is optimized by the numerical optimization method using desirability analysis. The amount of wear is less in Al-B4C composites when compared to unreinforced aluminium alloy. The wear rate increases with an increase in load and decreases with the sliding speed. The wear resistance increases with an increase in the weight fraction of the boron carbide particles. Practical implications The produced Al-B4C composites can retain properties at high temperature. It is used in nuclear and automotive products owing its high specific strength and stiffness. The main applications are neutron absorbers, armour plates, high-performance bicycles, brake pads, sand blasting nozzles and pump seals. Originality/value Al/B4C composites have good potential in the development of wear-resistant products.
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Menghani, Jyoti, and Kunal Dwivedi. "Effect of molybdenum addition on microstructure and mechanical properties of plain carbon steel weld." Metallurgical and Materials Engineering 22, no. 4 (December 31, 2016): 269–84. http://dx.doi.org/10.30544/245.
Повний текст джерелаАнотація:
The present investigation has two main objectives; first is optimization of welding process parameters of submerged arc welding (SAW) using Taguchi philosophy and second is to improve the mechanical properties such as strength and microhardness of weld joint by alloying with varying amounts of molybdenum. For optimization of welding process, parameters Taguchi philosophy have been applied on a mild steel plate (AISI C- 1020) of 10 mm thickness with 60o groove angle with arc voltage and welding speed as variables and bead width as output variables. A mathematical relationship between bead width, arc voltage and welding speed has also been found using multiple regression analysis for the present base metal plate geometry. After optimizing welding parameters, molybdenum has been added individually to the welding area in varying percentages. The properties of alloyed and unalloyed weld metal bead are compared. The mechanical characterization of weld has been done in terms of microhardness, tensile strength, whereas microstructural characterization has been performed using optical microscopy, XRD and EDS. The presence of molybdenum resulted in bainite structure in weld bead having a refined grain structure, enhancement in tensile strength and microhardness. The XRD results showed the formation of molybdenum carbides justifying the increase in microhardness value.
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MAKAROV, V. F., and I. N. SEDININ. "CALCULATION OF THE VARIABILITY OF THE VARIABLE FACTORS OF THE MATHEMATICAL MODEL OF FLATNESS DEVIATION IN FACE MILLING OF HIGH-CARBON HARDENED STEEL." Fundamental and Applied Problems of Engineering and Technology, no. 1 (2021): 60–67. http://dx.doi.org/10.33979/2073-7408-2021-345-1-60-67.
Повний текст джерелаАнотація:
The enterprise carried out theoretical and experimental studies of face milling of hardened steel by the method of experiment planning. One of the tasks was to determine the deviation from the flatness of the processed surface of the samples and the construction of graphs and surfaces of the function of the mathematical model. For the tests, a milling machine and measuring equipment of increased accuracy, as well as a cutting tool with carbide plates, were used. As a result, a full factorial experiment was carried out, as independent variables were taken: cutting speed, feed per tooth and depth of cut. When determining the coefficients of the polynomial equation, a central compositional orthogonal design of the second order was used. Regression analysis was performed using Microsoft Excel, Wolfram Alpha and Statistica programs and a mathematical model of deviation from flatness was found, and the results of calculations were entered into the final table. On the basis of a mathematical model, in Microsoft Excel and Mathcad programs, graphs and hypersurfaces of a function are built for various interactions of variables. Significant variables were calculated for one-factorial and two-factorial influence on the response function.
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Gonzalez-Pociño, Alejandro, Florentino Alvarez-Antolin, and Juan Asensio-Lozano. "Optimization of Quenching and Tempering Parameters for the Precipitation of M7C3 and MC Secondary Carbides and the Removal of the Austenite Retained in Vanadis 10 Tool Steel." Metals 9, no. 6 (May 29, 2019): 627. http://dx.doi.org/10.3390/met9060627.
Повний текст джерелаАнотація:
Vanadis 10 steel is a powder metallurgy processed tool steel. The aim of the present study is to analyze the microstructural variation in this steel that takes place when the process variables related to the heat treatments of quenching and tempering are modified. Specifically, the destabilization of austenite, the precipitation of secondary carbides and the amount of retained austenite were analyzed. The research methodology employed was a Design of Experiments (DoE). The percentage and types of precipitated crystalline phases were determined by XRD, while the microstructure was revealed by means of SEM-energy-dispersive X-ray spectroscopy (EDX). The destabilization of austenite was favored by tempering at 600 °C for at least 4 h. These same conditions stimulated the removal of the retained austenite and the precipitation of M7C3 secondary carbides. For the precipitation of MC secondary carbides, it was necessary to maintain the steel at a temperature of 1100 °C for at least 8 h. The highest hardness values were obtained when the tempering temperature was lower (500 °C). Tempering in air or oil did not have a significant influence on the hardness of the steel after double or triple tempering at 500 or 600 °C. These results allow the manufacturers of industrial tools and components that use this type of steel in the annealed state as a material to define the most suitable quenching and tempering heat treatment to optimize the in-service behavior of these steels.
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Khan, Muhammad Sohail, Rehan A. Shah, Sun Mei, Shabnam, Aamir Khan, and Said A. Shah. "Active and passive control of nanoparticles in squeezing flow under the influence of magnetic field of variable intensity." Advances in Mechanical Engineering 14, no. 1 (January 2022): 168781402210752. http://dx.doi.org/10.1177/16878140221075200.
Повний текст джерелаАнотація:
According to researchers, the nano-particles utilized in nano-fluids are typically comprised of metals, oxides, carbides, or carbon nanotubes. Nano-fluids have a wide range of applications including heat transfer, soil remediation, lubrication, oil recovery, and detergency. The current study focuses on the investigation of the active and passive control of nanoparticles between the squeezing plates in the presence of a magnetic field. The traditional Navier-Stokes nano-fluid equation along with the Maxwell equation, the magnetic force term, the energy equation, and the volume fraction equation are converted into the ordinary differential equations for establishing natural parameters. The Coupled systems of non-linear ODEs are then solved numerically through parametric continuation method. The Nusselt number, entropy generation, and nanoparticles volume fractions profiles are shown graphically to see the effect of several parameter under consideration. For accuracy, the results obtained by PCM has been compared with the result by BVP4C. It has been observed that the increase in the squeezing parameter decreases the fluid temperature. The active control of nano-particles decreases the mass transfer while passive control increases the mass transfer. Also, the active and passive of nanoparticles increases the temperature gradient with the increase of thermophoresis parameter. The same but opposite behavior is also observed for mass transfer. The increase in [Formula: see text], [Formula: see text], and [Formula: see text] for active and passive of nanoparticles and boundary layer thickness decreases the entropy generation.
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Trzepieciński, Tomasz, Marcin Szpunar, and Robert Ostrowski. "Split-Plot I-Optimal Design Optimisation of Combined Oil-Based and Friction Stir Rotation-Assisted Heating in SPIF of Ti-6Al-4V Titanium Alloy Sheet under Variable Oil Pressure." Metals 12, no. 1 (January 7, 2022): 113. http://dx.doi.org/10.3390/met12010113.
Повний текст джерелаАнотація:
The aim of this paper is to determine the optimal input parameters for the process in order to ensure the maximum formable wall angle is obtained in a conical frustum with a varying wall angle fabricated using Single Point Incremental Forming (SPIF). The test material was 0.8-mm-thick Ti-6Al-4V titanium alloy sheets, and the test used a tungsten carbide tool with a rounded tip with a radius of 4 mm. Complete workpieces were heated using hot oil with a temperature of about 200 °C, and in addition, the high rotation speed of the forming tool generated an amount of friction heat. The input parameters were tool rotational speed, feed rate, step size, and tool rotation direction. Various oil pressures were used to improve both the accuracy of the components formed and the friction heating process. On the basis of calculations performed by means of the response surface methodology, split-plot I-optimal design responses were obtained by means of polynomial regression models. Models were fitted using REstricted Maximum Likelihood (REML), and p-values are derived using the Kenward–Roger approximation. Observation of the fracture surface of Ti-6Al-4V drawpieces showed that the destruction is as a result of ductile fracture mode. Tool rotational speed and step size are the most significant factors that affect the axial force, followed by feed rate. It was also found that step size is the most significant factor that affects the in-plane SPIF force.
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Bukhari, Jaffar Hussain, Mohammad Rauf Ahmed, Rabia Zafar, Naghma Parveen, Sana Chaudhry, and Hafsa Gul. "Dentists’ preference for Vital and Non-vital Tooth Bleaching Material in Teaching Institutions of Multan." Pakistan Journal of Medical and Health Sciences 15, no. 8 (August 30, 2021): 2445–47. http://dx.doi.org/10.53350/pjmhs211582445.
Повний текст джерелаАнотація:
Objective: The objective of this study was three fold; to investigate the preference of dentists regarding the technique for vital and non-vital tooth bleaching, to find out the materials used for vital and non-vital tooth bleaching and to evaluate the influence of post-graduate training, working place and clinical experience on techniques and material used. Methodology: A cross sectional study was carried out using a questionnaire with dentists working in three teaching institutes of Multan, Nishtar Institute of Dentistry (NID), Bakhtawar Amin Medical & Dental College (BAMDC) and Multan Medical & Dental College (MMDC). A total of 170 questionnaires were distributed and 154 recovered, at a response rate of 90.5%. Information about post-graduate training, working place and clinical experience was obtained. The information regarding technique and material used for vital and non-vital tooth bleaching was also collected. Data were analyzed using SPSS version 22 and frequencies and percentages were calculated along with association between the treatment options and other variables. Results: Majority of the dentists 81.8% and 75.3% preferred in-office technique for vital and non-vital tooth bleaching respectively. For vital tooth bleaching, 31.8% selected HP 6% and 28.4% opted CP10-22%. For non-vital tooth bleaching, 34.8% selected SP mixed with water/HP and 26.6% opted HP37%. Conclusion: Clinical experience and working place significantly influenced the bleaching technique for vital teeth not for the non-vital. No significant influence of post-graduation, clinical experience and working place was found on material used for vital or non-vital bleaching. Key Words: Vital tooth bleaching, Non-vital tooth bleaching, Hydrogen peroxide, Carbamide peroxide, Sodium perborate
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Villagrán Colón, Víctor Ernesto, Mirna Oldemia Calderón Márquez, Ricardo Alfredo Carrillo-Cotto, Flavio Fernando Demarco, and Luiz Alexandre Chisini. "Dentist’s preferences on vital and nonvital tooth bleaching." Brazilian Journal of Oral Sciences 20 (February 8, 2021): e211711. http://dx.doi.org/10.20396/bjos.v20i00.8661711.
Повний текст джерелаАнотація:
Aim: The present study aimed to investigate if the Guatemalan dentist’s options on tooth bleaching could be influenced by their time in clinical practice, the level of specialization or their working place. Methods: A representative sample of dentists working in clinical practice in Guatemala was selected. Data were collected using a self-administered questionnaire with information related to gender, professional characteristics (time since graduation in years and working place) and preferences regarding vital (at-home or in-office; type and concentration of bleaching agent) and the nonvital tooth bleaching (bleaching agent used). The analysis was performed and the association between preference for bleaching technique and independent variables were investigated using Fisher’s exact test. Results: 200 dentists were interviewed. More than half of dentists were male (57.0%) with time since graduation between 11 and 20 years (n= 64; 32.3%). Dentists mostly (60.5%) preferred in-office technique for vital bleaching, with 10-20% Carbamide peroxide (CP) as the preferred agent (50%). For nonvital teeth, the preferred agent (46.8%) was 37% Hydrogen Peroxide (HP). About the associations, younger dentists (< 20 years of graduation) selected mostly in-office technique, while those with more than 20 years indicated more the at-home technique. Also, the dentists working in private practice chose more frequently in-office technique. Thus, the in-office technique was more popular among Guatemalan dentists, with 10-20% CP and 37% HP selected as favorite bleaching agents for vital and nonvital techniques, respectively. Conclusion: The time of clinical practice and working place influenced some choices.
Дисертації з теми "Carbide plate variables"
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Таран, Євгеній Сергійович. "Оправка розточна збірна". Bachelor's thesis, КПІ ім. Ігоря Сікорського, 2019. https://ela.kpi.ua/handle/123456789/31456.
Повний текст джерелаАнотація:
Метою дипломного проекту є проектування оправки розточної збірної,
яка застосовується для обробки внутрішніх та зовнішніх циліндричних
поверхонь, свердління отвору, точіння внутрішніх канавок та підрізання
торця. Даний інструмент оснащений змінними твердосплавними пластинами,
які надійно закріплені в корпусі інструменту. Також було проаналізовано
конструкції інструментів для оброблення різних типів поверхонь, створене
робоче креслення та 3D модель інструменту, розроблено технологію
виготовлення і розраховано режими різання, вибрано та розраховано
технологічне пристосування для фрезерування посадочних поверхонь під
пластину з твердого сплаву, представлена керуюча програма для верстату з
ЧПК та візуалізація процесу обробки.The purpose of the diploma project is the design of the mandrel of the blade assembly, which is used for the treatment of internal and external cylindrical surfaces, drilling a hole, rolling the grooves and triming the ends. This tool is equipped with replaceable carbide plates, which are securely mounted in the tool casing. The structure of the tools for processing various types of surfaces was also analyzed, a working drawing and a 3D model of the tool were created, a production technology was developed and cutting patterns were calculated, a technological device for milling the landing surfaces under a solid alloy plate was selected and calculated, the control program for the CNC machine and visualization of the processing process are presented.
Тези доповідей конференцій з теми "Carbide plate variables"
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Panday, Radhika, Shenjia Zhang, Jon Ogborn, and Badri K. Narayanan. "Variables Affecting Fracture Toughness of Welds in T-K-Y Connections." In ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-24205.
Повний текст джерелаАнотація:
Fracture toughness of tubular welded joints is one of the critical factors affecting the structural integrity and reliability of offshore structures, such as platforms and subsea pipelines. The factors affecting the design fracture toughness of these structures are related to, both, the welding process as well as the chemical composition of the weld metal. The welding process in this application typically comprises of depositing weld metal in the tubular joints of varying thicknesses through series of weld passes. The number of weld passes required for welding these joints subjects the weld metal to repetitive cycles of heating and cooling. The effect of the thermal cycling introduces significant heterogeneity in the microstructure. This is further exacerbated by the presence of micro-alloying elements such as Niobium (Nb) and Vanadium (V) that form complex carbides, nitrides and carbo-nitrides during post weld heat treatment (PWHT). The focus of this work is to evaluate the effect of micro-alloying elements on the ductile to brittle transition temperature and the mode of fracture at temperatures relevant to offshore applications. A threshold Nb and V level has been determined for achieving acceptable weld metal toughness. The improvement in the fracture toughness using this approach has been quantified by Charpy V-Notch (CVN) and Crack Tip Opening Displacement (CTOD) measurements. The Ductile to Brittle Transition Temperature (DBTT) has been shown to be shifted to lower temperatures by 25 °C after post weld heat treatment in the welds where the total amount of Nb and V are controlled to less than 40 ppm. A wet precipitate extraction technique was used to extract precipitates from the welds to establish the presence of fine Nb rich precipitates in the welds with the higher DBTT. The weld deposited with controlled levels of Nb and V was further tested in different joint configurations and base plate thickness. The fracture toughness was evaluated by CTOD testing of the weld in two different thicknesses (50 mm and 70 mm). Increased specimen thickness resulted in lower CTOD values.
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Subramanian, S. V., Xiaoping Ma, Chengliang Miao, Xiaobing Zhang, and Laurie Collins. "Microstructure Engineering of Thicker Gage Niobium Microalloyed Line Pipe Steel With Enhanced Toughness by High Temperature Processing Using TiN-NbC Composite Precipitate." In 2016 11th International Pipeline Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/ipc2016-64052.
Повний текст джерелаАнотація:
Prediction of crack arrestability of higher grade line pipe steel microalloyed with niobium in full scale burst tests based on laboratory simulation tests including Charpy impact, DWTT and CTOD is rendered difficult, as the full scale burst test is found to be far more sensitive to microstructure variables than current laboratory tests. This paper deals with nano-scale TiN-NbC composite precipitate engineering as an alternative approach to strain-induced precipitation of NbC to produce thicker gage plate or coil with enhanced toughness and resistance to ductile fracture propagation of line pipe steel. Microstructure engineering is based on identification of key microstructural parameters to which target properties can be related, and engineer the target microstructure through design of base chemistry and optimization of processing schedules. Nano-scale precipitate engineering based on control of spacing and size of TiN-NbC composite precipitate offers a new approach to achieve excellent strength and toughness (300J at −60C) of line pipe steels through control of target microstructure consisting of: (i) refinement of austenite grain size (under 30 microns) of transfer bar before pancaking, (ii) high volume fraction of acicular ferrite with adequate plasticity to increase resistance to ductile fracture propagation, (iii) high density and uniform dispersion of high angle grain boundaries that arrest micro-cracks to suppress brittle fracture initiation, (iv) less intensity of unfavorable {100}<011> texture component that facilitate the propagation of brittle fracture, (v) suppression of ultra-fine precipitates in the matrix, thereby enlarging plastic zone ahead of the crack tip to blunt the tip of the crack, and (vi) suppression of coarse brittle constituents (carbides or MA products) that initiate brittle fracture. Experimental results are presented on thermo-mechanically rolled X-90 and K-60 that validate the concept of microstructure engineering using TiN-NbC composite precipitate engineering to enhance strength and fracture toughness.