Moderating strain hardening rate to produce high ductility and high strength in a medium carbon TRIP steel

作者：Xin Dong, Y.F. Shen, Yuntian Zhu · 发表于：Materials Research Letters · 年份：2022 · DOI：10.1080/21663831.2022.2116295 · 被引用次数：57 · 研究领域：Microstructure and Mechanical Properties of Steels、Metal Alloys Wear and Properties、Hydrogen embrittlement and corrosion behaviors in metals

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.