Influence of original microstructure on the transformation behavior and mechanical properties of ultra-high-strength TRIP-aided steel

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• 作者：Hong-xiang Yin (1) (2)
  Ai-min Zhao (1) (2)
  Zheng-zhi Zhao (1) (2)
  Xiao Li (1) (2)
  Shuang-jiao Li (1) (2)
  Han-jiang Hu (1) (2)
  Wei-guang Xia (3)
  
  1. Metallurgical Engineering Research Institute ; University of Science and Technology Beijing ; Beijing ; 100083 ; China
  2. Beijing Laboratory of Metallic Materials and Processing for Modern Transportation ; Beijing ; 100083 ; China
  3. Key Laboratory for Mechanics in Fluid Solid Coupling Systems ; Institute of Mechanics ; Chinese Academy of Sciences ; Beijing ; 100190 ; China
  
• 关键词：high strength steels ; transformation ; induced plasticity ; phase transformations ; mechanical properties ; original microstructure ; work hardening
• 刊名：International Journal of Minerals, Metallurgy, and Materials
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：22
• 期：3
• 页码：262-271
• 全文大小：3,497 KB
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• 刊物类别：Chemistry and Materials Science
• 刊物主题：Materials Science
  Metallic Materials
  Mineral Resources
  
• 出版者：Journal Publishing Center of University of Science and Technology Beijing, in co-publication with Sp
• ISSN：1869-103X

文摘

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.