期刊
MATERIALS RESEARCH LETTERS
卷 11, 期 1, 页码 69-75出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/21663831.2022.2116295
关键词
TRIP; mechanical properties; strain hardening rate; ductility; strength
A principle is proposed and verified that an optimized moderate strain hardening rate is desired for producing the best mechanical properties for metallic materials. It is demonstrated that moderate strain hardening rate is desired for better ductility and high yield strength in a medium carbon TRIP steel. By adjusting the temperature for bainitic transformation, the TRIP kinetics were tailored to produce moderated but long-lasting strain hardening for high ductility and high yield strength.
IMPACT STATEMENT A principle is proposed and verified that an optimized moderate strain hardening rate is desired to produce the best mechanical properties for metallic materials. High strain hardening rate is usually pursued for high ductility. Here we report that moderate strain hardening rate is desired for producing better ductility and high yield strength, which is demonstrated in a medium carbon TRIP steel. By adjusting the temperature for bainitic transformation, the morphology, carbon content and residue stress of retained austenite were tuned to tailor the TRIP kinetics during tensile tests, which produced moderated but long-lasting strain hardening for high ductility while at the same time resulted in high yield strength. This strategy should work well for most materials, which usually have a limited ultimate strength.
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