Journal
JOM
Volume 74, Issue 6, Pages 2377-2385Publisher
SPRINGER
DOI: 10.1007/s11837-022-05279-z
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Funding
- Indira Gandhi Centre for Atomic Research, Kalpakkam, Department of Atomic Energy, Government of India
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The dynamic transformation of austenite to ferrite in a 9%Cr alloy steel is investigated in this study. The study reveals the essential characteristics of the transformation, its driving force, and the influencing factors. It is found that stress-driven displacive transformation occurs, and the transformation can be controlled by strain rate.
The dynamic transformation of austenite to ferrite occurs in various steels and has technological implications for grain refinement. Despite significant research, ambiguities persist about the nature of this transformation, its driving force, and the influencing parameters. In the current work, these outstanding issues are addressed through a study of hot deformation textures associated with the dynamic transformation in a 9%Cr alloy steel. It is found that hot deformation textures of the parent and daughter phases contain crucial information about the nature of the transformation, and it is shown that the dynamic transformation is driven by stress rather than strain. Further, it bears signs of displacive rather than diffusional transformation and can be controlled through strain rate.
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