A novel multi-step intercritical heat treatment induces multi-phase microstructure with ultra-low yield ratio and high ductility in advanced high-strength steel

作者：Xie, Z. J.; Han, G.; Zhou, W. H.; Wang, X. L.; Shang, C. J.^*; Misra, R. D. K.

来源：Scripta Materialia, 2018, 155: 164-168.

DOI：10.1016/j.scriptamat.2018.06.042

• lnterctitical heat treatment
• Deformation induced martensite transformation
• Retained austenite
• Low yield ratio

A significant volume fraction of 26% retained austenite was obtained via a two-step intercritical treatment in a low carbon low alloy steel with ultra-high tensile strength of similar to 1200 MPa, ultra-low yield ratio of 0.32, excellent uniform elongation of similar to 16.4% and total elongation of similar to 23%. The ultra-low yield ratio and excellent uniform elongation implied high work hardening and excellent formability. The high work hardening and ultra-high tensile strength are attributed to deformation-induced twin-martensite.

• 出版日期2018-10
• 单位北京科技大学