Hong-xiang Yin, Ai-min Zhao, Zheng-zhi Zhao, Xiao Li, Shuang-jiao Li, Han-jiang Hu, and Wei-guang Xia, Influence of original microstructure on the transformation behavior and mechanical properties of ultra-high-strength TRIP-aided steel, Int. J. Miner. Metall. Mater., 22(2015), No. 3, pp. 262-271. https://doi.org/10.1007/s12613-015-1070-6
Cite this article as:
Hong-xiang Yin, Ai-min Zhao, Zheng-zhi Zhao, Xiao Li, Shuang-jiao Li, Han-jiang Hu, and Wei-guang Xia, Influence of original microstructure on the transformation behavior and mechanical properties of ultra-high-strength TRIP-aided steel, Int. J. Miner. Metall. Mater., 22(2015), No. 3, pp. 262-271. https://doi.org/10.1007/s12613-015-1070-6
Hong-xiang Yin, Ai-min Zhao, Zheng-zhi Zhao, Xiao Li, Shuang-jiao Li, Han-jiang Hu, and Wei-guang Xia, Influence of original microstructure on the transformation behavior and mechanical properties of ultra-high-strength TRIP-aided steel, Int. J. Miner. Metall. Mater., 22(2015), No. 3, pp. 262-271. https://doi.org/10.1007/s12613-015-1070-6
Citation:
Hong-xiang Yin, Ai-min Zhao, Zheng-zhi Zhao, Xiao Li, Shuang-jiao Li, Han-jiang Hu, and Wei-guang Xia, Influence of original microstructure on the transformation behavior and mechanical properties of ultra-high-strength TRIP-aided steel, Int. J. Miner. Metall. Mater., 22(2015), No. 3, pp. 262-271. https://doi.org/10.1007/s12613-015-1070-6
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 traditional 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 microstructure, 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, resulting in a lower transformation rate and consequently contributing to a higher elongation compared to F-TRIP steel. Work hardening behavior is also discussed for both types of steel.
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 traditional 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 microstructure, 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, resulting in a lower transformation rate and consequently contributing to a higher elongation compared to F-TRIP steel. Work hardening behavior is also discussed for both types of steel.
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