The influence of substitutional elements on the transformability of 3CR12 steel

 

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dc.contributor.advisor Knutsen, Robert D en_ZA
dc.contributor.author Jungbacke, Nils Gene en_ZA
dc.date.accessioned 2014-11-05T17:16:47Z
dc.date.available 2014-11-05T17:16:47Z
dc.date.issued 1996 en_ZA
dc.identifier.citation Jungbacke, N. 1996. The influence of substitutional elements on the transformability of 3CR12 steel. University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/9224
dc.description Includes bibliographical references. en_ZA
dc.description.abstract An investigation has been carried out on a dual-phase 12 % chromium steel, designated 3CR12, with the aim of developing its composition to improve its properties. By the addition of appropriate alloying elements, it was hoped to produce a fully austenitic structure in the rolling temperature range, and at the same time to enhance the kinetics of the decomposition of austenite so that a fully ferritic structure could be obtained after air cooling. The absence of delta ferrite during hot rolling would eliminate the highly anisotropic structure currently found in 3CR12, whilst accelerating the transformation to alpha ferrite might eliminate the need for an annealing treatment. Volume fraction analysis (VF A) of specimens quenched from a soaking temperature of 1000°C showed that Co, Ni and Cu stabilise austenite, whilst Si and Al have the opposite effect. These results were confirmed by finding the equilibrium transformation temperatures of the decomposition of austenite to ferrite using dilatometry, and by investigating the partition of alloying elements between delta ferrite and austenite at I 000°C using the electron microprobe. The effects of the alloying elements on the kinetics of the transformation were investigated by VF A of specimens transformed from 1000°C, and by the use of dilatometry. Dilatometry was used to find the slowest cooling rate at which the alloy was fully untransformed. It was found that Si and Al enhance the kinetics of transformation, whilst Co, Ni and Cu hinder them. The effect of each element is discussed with respect to three factors: the delta ferrite content prior to the transformation, the temperature range of transformation, and the thermodynamic effects of the element. en_ZA
dc.language.iso eng en_ZA
dc.subject.other Applied Science en_ZA
dc.title The influence of substitutional elements on the transformability of 3CR12 steel en_ZA
dc.type Master Thesis
uct.type.publication Research en_ZA
uct.type.resource Thesis en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Engineering and the Built Environment
dc.publisher.department Centre for Materials Engineering en_ZA
dc.type.qualificationlevel Masters
dc.type.qualificationname MSc en_ZA
uct.type.filetype Text
uct.type.filetype Image
dc.identifier.apacitation Jungbacke, N. G. (1996). <i>The influence of substitutional elements on the transformability of 3CR12 steel</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Centre for Materials Engineering. Retrieved from http://hdl.handle.net/11427/9224 en_ZA
dc.identifier.chicagocitation Jungbacke, Nils Gene. <i>"The influence of substitutional elements on the transformability of 3CR12 steel."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Centre for Materials Engineering, 1996. http://hdl.handle.net/11427/9224 en_ZA
dc.identifier.vancouvercitation Jungbacke NG. The influence of substitutional elements on the transformability of 3CR12 steel. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Centre for Materials Engineering, 1996 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/9224 en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Jungbacke, Nils Gene AB - An investigation has been carried out on a dual-phase 12 % chromium steel, designated 3CR12, with the aim of developing its composition to improve its properties. By the addition of appropriate alloying elements, it was hoped to produce a fully austenitic structure in the rolling temperature range, and at the same time to enhance the kinetics of the decomposition of austenite so that a fully ferritic structure could be obtained after air cooling. The absence of delta ferrite during hot rolling would eliminate the highly anisotropic structure currently found in 3CR12, whilst accelerating the transformation to alpha ferrite might eliminate the need for an annealing treatment. Volume fraction analysis (VF A) of specimens quenched from a soaking temperature of 1000°C showed that Co, Ni and Cu stabilise austenite, whilst Si and Al have the opposite effect. These results were confirmed by finding the equilibrium transformation temperatures of the decomposition of austenite to ferrite using dilatometry, and by investigating the partition of alloying elements between delta ferrite and austenite at I 000°C using the electron microprobe. The effects of the alloying elements on the kinetics of the transformation were investigated by VF A of specimens transformed from 1000°C, and by the use of dilatometry. Dilatometry was used to find the slowest cooling rate at which the alloy was fully untransformed. It was found that Si and Al enhance the kinetics of transformation, whilst Co, Ni and Cu hinder them. The effect of each element is discussed with respect to three factors: the delta ferrite content prior to the transformation, the temperature range of transformation, and the thermodynamic effects of the element. DA - 1996 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1996 T1 - The influence of substitutional elements on the transformability of 3CR12 steel TI - The influence of substitutional elements on the transformability of 3CR12 steel UR - http://hdl.handle.net/11427/9224 ER - en_ZA


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