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Teses / dissertações sobre o tema "18MND5 low alloy steel"

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Publicado: 1 de fevereiro de 2025

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1

Asselin, Cosson Théotime. "Étude des effets de fermeture des fissures de fatigue sous chargement à rapport de charge négatif." Electronic Thesis or Diss., Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2024. http://www.theses.fr/2024ESMA0030.

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La fatigue est avec la corrosion sous contrainte le principal moteur des dégradations observées sur les composants du parc nucléaire français. Les chargements induisant de la fatigue oligocyclique dans les composants primaires sont d’origine thermique et peuvent être à rapport de charge négatif. La justification des composants vis-à-vis de la propagation de fissure en fatigue est actuellement effectuée de manière pénalisante, sans prise en compte du sillage plastique. Des travaux de R&D sont donc requis pour améliorer les modèles de propagation en fatigue pour des chargements variables. C’

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2

Cussac, Paul. "Influence d’imperfections surfaciques sur la tenue en fatigue de composants nucléaires." Thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2020. http://www.theses.fr/2020ESMA0001.

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Dans le contexte de l’industrie nucléaire, la présence éventuelle d’imperfections surfaciques pouvant être générées par des chutes ou frottements d’outils lors de la fabrication et la maintenance des composants se doit d’être justifiée vis-à-vis du phénomène de fatigue. L’objectif premier de cette étude est d’évaluer dans quelle mesure la présence d’imperfections de surface de l’ordre de quelques dixièmes de millimètre de profondeur peut impacter la durée de vie en fatigue oligocyclique. En parallèle, cette étude cherche à décrire, de manière qualitative et quantitative, l’amorçage et la propa

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3

Romo, Arango Sebastian A. "Low-Cycle Fatigue of Low-Alloy Steel Welded Joints." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1573054310351145.

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4

Yin, Maggie Huaying Materials Science &amp Engineering Faculty of Science UNSW. "Metal dusting of iron and low alloy steel." Awarded by:University of New South Wales. School of Materials Science and Engineering, 2006. http://handle.unsw.edu.au/1959.4/25188.

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Metal dusting is a kind of catastrophic corrosion phenomenon that can be observed in several of petrochemical processes. It occurs on iron-, nickel- and cobalt-base metals in carbonaceous atmospheres at high temperature when gaseous carbon activity is higher than one. The process is particularly rapid for ferritic alloys The aim of this project was to compare the dusting kinetics of pure iron and a 2.25Cr-1Mo alloy steel under CO-H2-H2O atmosphere at 650??C. Polished (3??m) samples of iron and the steel were exposed to flowing CO-H2-H2O gas atmospheres at 650??C, when the gases were supersat

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5

Myers, M. R. "Damage accumulation in a low alloy ferritic steel." Thesis, University of Manchester, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370975.

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A study has been made of creep damge accumulation in two casts of l%.Cr-1/2%i.Mo low alloy steel. Creep tests and creep crack growth tests have been carried out at 823K to determine the nature of the damage accumulation and to attempt to relate microscopic damage mechanisms to the macroscopic fracture parameters. Four types of specimen were tested and failure of all occurred by the continuous nucleation. growth and coalescence of grain boundary cavities. A mechanism for the growth of cavities is suggested. based on grain boundary diffusion coupled with geometric constraint. The influence of co

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6

Boåsen, Magnus. "Modeling framework for ageing of low alloy steel." Licentiate thesis, KTH, Hållfasthetslära (Inst.), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-246036.

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Ageing of low alloy steel in nuclear applications commonly takes the form as a hardening and an embrittlement of the material. This is due to the evolution of the microstructure during irradiation and at purely thermal conditions, as a combination or separate. Irradiation introduces evenly distributed solute clusters, while thermal ageing has been shown to yield a more inhomogeneous distribution. These clusters affect the dislocation motion within the material and results in a hardening and in more severe cases of ageing, also a decreased work hardening slope due to plastic strain localization

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7

Chatterjee, Amit. "Hydrogen degradation of plain carbon and low alloy steels /." The Ohio State University, 1986. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487264603219536.

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8

Donohoe, C. J. "Corrosion fatigue of a high strength low alloy steel." Thesis, University of Sheffield, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.322985.

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9

Walker, Nigel Stuart. "Type IV creep cavitation in low alloy ferritic steel weldments." Thesis, University of Bristol, 1997. http://hdl.handle.net/1983/efa6973c-9a3d-4a95-8297-61f12cbde92d.

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10

Cooper, David. "The boundary lubricated friction and wear of low alloy steel." Thesis, Aston University, 1989. http://publications.aston.ac.uk/8067/.

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Pin on disc wear machines were used to study the boundary lubricated friction and wear of AISI 52100 steel sliding partners. Boundary conditions were obtained by using speed and load combinations which resulted in friction coefficients in excess of 0.1. Lubrication was achieved using zero, 15 and 1000 ppm concentrations of an organic dimeric acid additive in a hydrocarbon base stock. Experiments were performed for sliding speeds of 0.2, 0.35 and 0.5 m/s for a range of loads up to 220 N. Wear rate, frictional force and pin temperature were continually monitored throughout tests and where possib

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11

Chen, Jhewn-Kuang. "Effects of alloying elements upon austenite decomposition in high strength low alloy steels." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-10102009-020227/.

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12

Schroth, James Gregory. "Combined mode I - mode III fracture toughness of a high-strength low-alloy steel /." The Ohio State University, 1985. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487260859496482.

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13

Stratford, G. C. "Type IV cracking in 1¼Cr - ½Mo low alloy steel welds." Thesis, Swansea University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.639124.

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Service experience has shown the main form of medium to long term damage and failure in low alloy steel weldments to be "TYPE IV" creep cracking in the intercritically transformed region of the heat affected zone (HAZ). This research programme aimed to define the fabricational, loading and microstructural factors which lead to this form of damage. Research welds, which were an accurate model of the geometry and microstructure of steam pipe weldments, were fabricated in tubular testpieces using standard welding techniques. The welds were subjected to a post-weld heat treatment (PWHT) of 700<SUP

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14

MAMANI, JULIO DAMIAN SUNI. "QUANTIFICATION OF AUSTENITE-MARTENSITE IN LOW ALLOY STEEL BY IMAGE ANALYSIS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2013. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=22902@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO<br>O objetivo deste trabalho foi desenvolver uma metodologia para quantificação, por microscopia, do microconstituinte Austenita-Martensita (AM) em um aço de alta resistência e baixa liga (ABRL) da classe API5LX80. Foram obtidas imagens de Microscopia Ótica (MO) em campo claro e Eletrônica de Varredura (MEV), nos modos de elétrons secundários (SE) e retroespalhados (BSE). As imagens foram quantificadas por Processamento e Análise Digital de Imagens (PADI) e os resultados dos dois

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15

Dawud, Sattar J. "Oxidational wear of low alloy steel in gases other than air." Thesis, Aston University, 1992. http://publications.aston.ac.uk/8096/.

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A pin on disc wear machine has been used to study the oxidational wear of low alloy steel in a series of experiments which were carried out under dry wear sliding conditions at range of loads from 11.28 to 49.05 N and three sliding speeds of 2 m/s, 3.5 m/s and 5 m/s, in atmosphere of air, Ar, CO2, 100% O2, 20% O2-80% Ar and 2% O2-98% Ar. Also, the experiments were conducted to study frictional force, surface and contact temperatures and surface parameters of the wearing pins. The wear debris was examined using x-ray diffraction technique for the identification of compounds produced by the wear

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16

Hu, Wei. "Data-driven metallurgical design for high strength low alloy (HSLA) steel." [Ames, Iowa : Iowa State University], 2008.

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17

De, Souza Bott Ivani. "The role of microstructure in the temper embrittlement of low alloy steels." Thesis, Sheffield Hallam University, 1987. http://shura.shu.ac.uk/19544/.

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A detailed investigation has been carried out to study the effects of heat treatment on the susceptibility to temper embrittlement (Ductile-Brittle transition temperature and low energy fracture characteristics) of eleven experimental steels. These experimental alloys represented a range of compositions related to engineering steels and corresponded to a nominal composition of 0.34 mass%C with alloying additions of Cr, Ni and Mo in varying combinations. These alloys were doped with P and Sb to study the effect of these additions on the susceptibility to temper embrittlement. These steels were

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18

Wilson, Peter. "Remanent creep life prediction in low-alloy ferritic steel power plant components." Thesis, University of Cambridge, 1991. https://www.repository.cam.ac.uk/handle/1810/221887.

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19

Anyanwu, Ezechukwu John. "Low Alloy Steel Susceptibility to Stress Corrosion Cracking in Hydraulic Fracturing Environment." University of Dayton / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1398948610.

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20

Wrigley, Nigel Stuart. "The fracture characteristics of a boron containing high strength low alloy steel." Thesis, University of Salford, 1994. http://usir.salford.ac.uk/43037/.

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This study is concerned with the fracture characteristics of RQT 701; a possible contender for the replacement of HY 100, the existing 690MNm-2 (100,000psi) strength level Naval quality steel. RQT 701 is a low nickel, boron containing quenched and tempered steel which is less expensive than HY 100 due to a lower nickel content. The hardenability is maintained by the boron addition. The preliminary testing of RQT 701 showed a variation in the impact transition temperature through the thickness of the plate. This study examines the possible causes of this variation in impact properties and makes

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21

Mohamed, Abdul Aziz Bin. "Creep life prediction of low alloy steel using neural network analysis of NDT." Thesis, Cranfield University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266946.

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22

Perrin, Ian James. "Computer-based type IV creep CDM design of low alloy ferritic steel weldments." Thesis, University of Manchester, 1995. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.617095.

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23

Coimbatore, Dhandayuth Venkatesh. "Cerium chloride inhibition for high strength low alloy steel exposed to sulphide polluted seawater." University of Western Australia. School of Mechanical Engineering, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0134.

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[Truncated abstract] Corrosion of steel structures caused by sulphide is a common engineering problem encountered by many industries, such as the petroleum, chemical processing, mining and mineral processing industries. The control of sulphide corrosion is still a controversial topic among corrosion engineers. There is an absence of guideline for a reliable acceptable limit of sulphide level in service and each processing industry has its own empirical values. Selection of inhibitors in the sulphide environment depends on laboratory testing before its actual application in pipelines and reacti

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24

Storer, S. M. "Simulation of heat affected zone microstructures in ½Cr - ½ Mo - ¼V low alloy steel weldments." Thesis, Swansea University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.639121.

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The microstructures developed in the heat affected zone of low alloy steel weldments are critically dependent upon the alloy composition and the thermal cycles introduced by the welding process. Review of available literature indicates that although a significant amount of research has been performed examining microstructural development, the bulk of this work has either been aimed at steels for low temperature application or has been used to overcome reheat cracking in ½ Cr- ½ Mo- ¼ V steels. In general it appears that the measures taken to prevent reheat cracking which occurs early in the li

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25

Needham, William Donald. "Stress corrosion cracking and hydrogen embrittlement of thick section high strength low alloy steel." Thesis, Massachusetts Institute of Technology, 1986. http://hdl.handle.net/10945/22123.

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An experimental study was conducted to evaluate the corrosion performance of weldments of a high strength low alloy(HSLA) steel in a simulated seawater environment. This steel, designated HSLA80, was developed by the United States Navy for use in ship structural applications. Stress corrosion CRACKING(SCC) and hydrogen embrittlement(HEM) were investigated by conducting 42 Wedge-Opening load(WOL) tests as a function of stress intensity and corrosion potential and 33 Slow Strain Rate(SSR) tests as a function of strain rate and corrosion potential. The corrosion potentials were chosen to simulate

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26

Lewis, Colin Andrew. "Prediction of thermal stress and strain generated during the quenching of low-alloy steel." Thesis, Sheffield Hallam University, 1990. http://shura.shu.ac.uk/19954/.

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The free edge of a quenched plate is subject to zero stress in a direction perpendicular to this edge. Therefore the thermal stresses set up in such a component must be modified in the vicinity of the edge in order to allow the required stress configuration to be produced. This is referred to as the 'edge effect' and its magnitude is conventionally estimated by the well-known Saint Venant Principle. However a detailed understanding of the variation in stress in such a specimen is not well understood and it has been the objective of the present programme to make a detailed elastic/plastic analy

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27

Rose, Scott Anthony. "The Effect of Cooling Rate of Friction Stir Welded High Strength Low Alloy Steel." BYU ScholarsArchive, 2013. https://scholarsarchive.byu.edu/etd/4181.

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The friction stir welding of steel has produced a hard zone in several different alloys. Despite its detrimental effects on weld toughness, the reasons behind neither its formation nor a method of reducing its size or effects have been explored. Recent advances in process control allow for direct heat input control, which combined with the use of backing plates of different thermal conductivity allows for an expansion of the process window. These control methods also affect the HAZ cooling rate by providing greater range (a 60% increase compared to a fixed backing plate) and control (five weld

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28

Evins, Joseph Lee. "Dependence of Strength on Corrosion-Fatigue Resistance of AISI 4130 Steel." Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5265.

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Automobile components are often exposed to aggressive environments as a result of aqueous salts from the road coming into contact with unprotected steel. This situation greatly reduces both the life and the appearance of the affected parts. Ultra-high strength steel parts are suspected to exhibit poor corrosion-fatigue properties and be more susceptible to corrosion in general. In this study, the effect of strength level on the decrease in fatigue life of AISI 4130 steel when exposed to an aqueous salt solution is quantified. The observed mechanical properties including corrosion-fatigue

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29

Razzak, Mohammad. "Precipitation and abnormal grain growth in low alloy steels." Phd thesis, INSA de Lyon, 2013. http://tel.archives-ouvertes.fr/tel-01015867.

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The objective of this thesis is to further understand the austenite Abnormal Grain Growth (AGG) phenomenon in relation with precipitation state in a low alloy steel. The abnormal grain growth is addressed from both experimental and numerical modeling point of view. Prior austenite grain size distribution, precipitation volume fraction and size distribution evolution of the different heat treated states are experimentally determined for two different industrial alloys (steel-A and steel-B) in different heat treated states and experimental results are compared with model predictions. A two-step

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30

Åkerlund, Elin, Rebecka Havo, Åberg Jakob Jonsson, Patrik Österberg, and Mikael Fredriksson. "High Performance Steel for Percussive Drilling." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-323387.

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Atlas Copco Secoroc AB are searching after new bulk materials for drill heads that are used in percussive drilling in order to improve their strength and durability. The aim of this project is to assist Atlas Copco in this search and provide them with further information regarding material properties, alloying elements, suppliers, etc. A literary study was carried out in order to identify materials that had UTS and KIC more than or equal to 1700 MPa and 70 MPa*m1/2, respectively. Materials that fulfilled these criteria were T250 grade maraging steel, Cobalt free maraging steel, High cobalt mar

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31

Åkerlund, Elin, Åberg Jakob Jonsson, Patrik Österberg, Rebecka Havo, and Mikael Fredriksson. "High Performance Steel for Percussive Drilling." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-323808.

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Atlas Copco Secoroc AB are searching after new bulk materials for drill heads that are used in percussive drilling in order to improve their strength and durability. The aim of this project is to assist Atlas Copco in this search and provide them with further information regarding material properties, alloying elements, suppliers, etc. A literary study was carried out in order to identify materials that had UTS and KIC more than or equal to 1700 MPa and 70 MPa*m^1/2, respectively. Materials that fulfilled these criteria were T250 grade maraging steel, Cobalt free maraging steel, High cobalt ma

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32

Chikwanda, Hilda Kundai. "Microstructural characterisation and remanent creep life evaluation of a 12CrMoVNb steel." Thesis, Imperial College London, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.363846.

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33

Almansour, Mansour A. "Sulfide stress cracking resistance of API-X100 high strength low alloy steel in H2S environments." Thesis, University of British Columbia, 2007. http://hdl.handle.net/2429/267.

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Sulfide Stress Cracking (SSC) resistance of the newly developed API-X100 High Strength Low Alloy (HSLA) steel was investigated in the NACE TM0177 "A" solution. The NACE TM0177 "A" solution is a hydrogen sulfide (H2S) saturated solution containing 5.0 wt.% sodium chloride (NaC1) and 0.5 wt.% acetic acid (CH3COOH). The aim of this thesis was to study the effect of microstructure, non-metallic inclusions and alloying elements of the X100 on H2S corrosion and SSC susceptibility. The study was conducted by means of electrochemical polarization techniques and constant load (proof ring) testing. Micr

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34

O'Brien, Evan Daniel. "Welding with Low Alloy Steel Filler Metal of X65 Pipes Internally Clad with Alloy 625: Application in Pre-Salt Oil Extraction." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1469018389.

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35

Tang, Zhenghua. "Optimising the transformation and yield to ultimate strength ration of Nb-Ti micro-alloyed low carbon line pipe steels through alloy and microstructural control." Pretoria : [s.n.], 2006. http://upetd.up.ac.za/thesis/available/etd-07212007-110711.

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36

Millar, Peter G. "Corrosion fatigue crack propagation behaviour of a high strength low alloy steel in a synthetic sea water environment." Thesis, Cranfield University, 1986. http://dspace.lib.cranfield.ac.uk/handle/1826/4443.

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The corrosion fatigue crack propagation behaviour of a high strength low alloy steel, N-A-XTRA 70, in a synthetic sea water solution was tested using S. E. N. specimens subjected to a loading frequency of 0.1 Hz and a load ratio of 0.6. In order to simulate the conditions encountered by a thumbnail type crack several specimens from each of the microstructural types tested, namely parent plate, heat affected zone and heat treated material, had their crack sides covered by transparent plastic covers. Severe overprotection and slight underprotection conditions were produced using cathodic protect

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37

Haji, Hasan Abdalla. "An analysis of microstructure and crystallographic texture in friction stir welded high strength low alloy steel." Thesis, University of Sheffield, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.589542.

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38

Abdullah, J. B. "The assessment of high temperature damage in 2.25 Cr - IMo low alloy steel using ultrasonic techniques." Thesis, Swansea University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.635833.

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In petrochemical plants and power generating utilities, creep behaviour will affect the service life of components operating at elevated temperatures and stresses. Non-destructive techniques which detect creep damage are therefore important for assessing the remaining service life of the affected components. Whilst various non-destructive techniques have been reported, further studies are necessary to refine and assess the potential of these techniques for quantitative measures to be used for residual life-time prediction. In this thesis, the use of ultrasonic techniques to quantify creep cavi

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39

Herbst, Matthias G. J. "Effect of chloride on environmentally assisted cracking of low alloy steels in oxygenated high temperature water." Thesis, Liverpool John Moores University, 2014. http://researchonline.ljmu.ac.uk/4569/.

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The aim of this thesis was to derive a better understanding with regard to the effects of chloride on the general corrosion behaviour of low-alloy steels (LAS) in oxygenated high-temperature water (HTW) and to investigate the underlying mechanisms for crack initiation and propaga-tion due to chloride assisted environmentally assisted cracking (EAC). Therefore, systematic investigations on the effect of chloride on the EAC behaviour of LAS were performed to un-derstand and elucidate the underlying mechanisms. The overall thesis is divided into three parts focussing on the effect of chloride on:

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40

Kilgallon, P. J. "The effect of sulphate reducing bacteria on the hydrogen absorption of cathodically protected high strength low alloy steel." Thesis, Cranfield University, 1994. http://dspace.lib.cranfield.ac.uk/handle/1826/7253.

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The hydrogen embrittlement of two HSLA steels was studied in conditions typical of the marine environment. Double cantilever beam specimens, heat treated to produce the microstructure in the heat affected zone of a weld, were tested in seawater containing sulphate reducing bacteria (SRB) over a range of cathodic protection (CP) potentials and the threshold stress intensities ([Threshold Stress Intensity]) were recorded. The hydrogen concentration absorbed by the steel ([Surface Hydrogen Concentration]) was measured and shown to be higher at more negative CP potentials and significantly increas

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41

Maropoulos, S. "The effect of heat treatment on structure-property relationships in a low alloy Ni-Cr-Mo-V steel." Thesis, University of Manchester, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370954.

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42

Jubica, Jubica. "Characterization of Secondary Carbides in Low-Alloyed Martensitic Model Alloy Tool Steels." Thesis, KTH, Materialvetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-284449.

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The development of tool steels for making and shaping other materials requires a better understanding of the material's properties during manufacture. These high-quality steels include many alloying elements, which give increased hardness during tempering. For producing hardened microstructures, austenite generation is essential. The martensite formed by rapid quenching of austenite followed by tempering helps develop high strength steels. Studying carbide precipitation is a challenge as they are very small in size, present only in small volume fractions and high number densities. The carbide

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43

Gould, Elijah Katunich. "Development of Constitution Diagram for Dissimilar Metal Welds in Nickel Alloys and Carbon and Low-Alloy Steels." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1285007217.

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44

Wei, Lingyun 1972. "Investigating correlations of microstructures, mechanical properties and FSW process variables in friction stir welded high strength low alloy 65 steel /." Diss., CLICK HERE for online access, 2009. http://contentdm.lib.byu.edu/ETD/image/etd3195.pdf.

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45

Wei, Lingyun. "Investigate Correlations of Microstructures, Mechanical Properties and FSW Process Variables in Friction Stir Welded High Strength Low Alloy 65 Steel." BYU ScholarsArchive, 2009. https://scholarsarchive.byu.edu/etd/2032.

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The present study focuses on developing a relationship between process variables, mechanical properties and post weld microstructure in Friction Stir Welded HSLA 65 steel. Fully consolidated welds can be produced in HSLA 65 steel by PCBN Convex-Scrolled-Shoulder-Step-Spiral (CS4) tool over a wide range of parameters. Microstructures in the nugget center (NC) are dominated by lath bainite and a few polygonal/allotriomorphic grain boundary ferrites. FSW dependent variables are related to FSW independent variables by non-linear relationship. Heat input is identified to be the best parameter index

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Buntain, Ryan John. "Effect of Microstructure on Hydrogen Assisted Cracking in Dissimilar Welds of Low Alloy Steel Pipes Joined with Nickel Based Filler Metals." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1577785066479763.

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Andersson, Jim. "Manufacturing of Welded Rings : Evaluation of Post-Weld Operations." Thesis, Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-74578.

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Pipe and ring blanks can be produced in several different ways. Today's focus on environmental effects motivates companies to develop processes that are as efficient as possible in their production. Ringsvets AB is a company that produces pipe and ring blanks from a flat stock by rolling and welding the piece to make it stay in its desired form. The direct benefit of the method is the minimizing of material loss, and it has thereby both environmental and economical advantages. The downside of the method is that the processes involved changes the mechanical behavior of the ring, locally around

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ムハマド, リファイ, and Muhammad Rifai. "Mechanical and corrosion properties of ultrafine-grained low C, N Fe-20%Cr steel produced by equal channel angular pressing." Thesis, https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB12902984/?lang=0, 2015. https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB12902984/?lang=0.

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Equal-channel angular pressing (ECAP) is one of the severe plastic deformation (SPD) to produce ultra-fine grain (UFG) material, and its principle and microstructural developments. The majority of papers on SPD materials have been devoted to the face centered cubic (FCC) structure materials such as Al, Cu and Ni. The UFG of high alloy ECAP processing has been difficult up to now, but we were successful in this study. Fe-20%Cr steel with extremely low C and N has different slip behavior from the FCC. The mechanical properties and corrosion resistance were investigated in term microstructural ev

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Zhang, Yunbo. "Effect of microstructure on oxidative wear of a dual-phase low-alloy steel under different gaseous atmospheres, sliding speeds, and oxidation temperatures." Electronic Thesis or Diss., Compiègne, 2022. http://www.theses.fr/2022COMP2699.

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Le comportement tribologique des aciers à double phase a été étudié aux effets de différentes fractions volumiques de martensite (MVF), d'environnements gazeux et de vitesses de glissement, à l'aide d'un tribomètre à bille sur disque, dans des conditions de charge constante et de glissement par friction sèche. Par ailleurs, le comportement tribologique des couches d'oxyde formées à différentes températures et MVF a été étudié par nanoindentation et par des expériences de grattage. Les expériences de glissement à sec ont démontré qu'une MVF plus faible, des vitesses de glissement plus élevées e

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Thompson, Alan. "High Strain Rate Characterization of Advanced High Strength Steels." Thesis, University of Waterloo, 2006. http://hdl.handle.net/10012/2831.

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The current research has considered the characterization of the high strain rate constitutive response of three steels: a drawing quality steel (DDQ), a high strength low alloy steel (HSLA350), and a dual phase steel (DP600). The stress-strain response of these steels were measured at seven strain rates between 0. 003 s<sup>-1</sup> and 1500 s<sup>-1</sup> (0. 003, 0. 1, 30, 100, 500, 1000, and 1500 s<sup>-1</sup>) and temperatures of 21, 150, and 300 °C. In addition, the steels were tested in both the undeformed sheet condition and the as-formed tube condition, so that tube forming e

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