Influence of original microstructure on the transformation behavior and mechanical properties of ultra-high-strength TRIP-aided steel |
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| Affiliation: | 1. Metal urgical Engineering Research Institute, University of Science and Technology Beijing, Beijing 100083, China;2. Key Laboratory for Mechanics in Fluid Solid Coupling Systems, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China |
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| Abstract: | The transformation behavior and tensile properties of an ultra-high-strength transformation-induced plasticity (TRIP) steel (0.2C–2.0Si–1.8Mn) were investigated by different heat treatments for automobile applications. The results show that F-TRIP steel, a tradi-tional TRIP steel containing as-cold-rolled ferrite and pearlite as the original microstructure, consists of equiaxed grains of intercritical ferrite surrounded by discrete particles of M/RA and B. In contrast, M-TRIP steel, a modified TRIP-aided steel with martensite as the original mi-crostructure, containing full martensite as the original microstructure is comprised of lath-shaped grains of ferrite separated by lath-shaped martensite/retained austenite and bainite. Most of the austenite in F-TRIP steel is granular, while the austenite in M-TRIP steel is lath-shaped. The volume fraction of the retained austenite as well as its carbon content is lower in F-TRIP steel than in M-TRIP steel, and austenite grains in M-TRIP steel are much finer than those in F-TRIP steel. Therefore, M-TRIP steel was concluded to have a higher austenite stability, re-sulting in a lower transformation rate and consequently contributing to a higher elongation compared to F-TRIP steel. Work hardening be-havior is also discussed for both types of steel. |
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| Keywords: | high strength steels transformation-induced plasticity phase transformations mechanical properties original microstructure work hardening |
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