Critical assessment: Martensite-start temperature for the gamma to epsilon transformation
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SCOPUS
- Title
- Critical assessment: Martensite-start temperature for the gamma to epsilon transformation
- Authors
- Yang, HS; Jang, JH; Bhadeshia, HKDH; Suh, DW
- Date Issued
- 2012-03
- Publisher
- Elsevier
- Abstract
- It is increasingly important in the context of high-manganese steels of the kind that lead to twinning-induced plasticity to be able to estimate the temperature at which epsilon-martensite forms when austenite is cooled. We find that the thermodynamic method used in similar calculations for alpha' martensite cannot in many cases be implemented because of apparently imprecise thermodynamic data, a conclusion partly validated using limited first-principles calculations. Alternative, empirical methods are also evaluated. The austenite grain size dependence of the martensite-start temperature has also been rationalised in terms of existing theory for alpha' martensite. Experiments have also been conducted to show that the problem in dealing with the epsilon-martensite does not lie in the precision with which the transformation can be measured using dilatometry. (C) 2011 Elsevier Ltd. All rights reserved.
- Keywords
- Martensite; Thermodynamics; Epsilon; Start temperature; High Mn steels; FE-MN-SI; SHAPE-MEMORY ALLOYS; AUSTENITE GRAIN-SIZE; CRITICAL DRIVING-FORCE; DAMPING CAPACITY; STAINLESS-STEEL; PHASE-STABILITY; IRON-CARBON; FE-24MN-6SI ALLOYS; NEEL TEMPERATURE
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/16815
- DOI
- 10.1016/J.CALPHAD.2011.10.008
- ISSN
- 0364-5916
- Article Type
- Article
- Citation
- CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY, vol. 36, page. 16 - 22, 2012-03
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