具有贝氏体铁素体和/或马氏体基体结构的超高强度 TRIP 辅助钢中剪切冲压表层损伤的评估

IF 2.6 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Metals Pub Date : 2024-09-11 DOI:10.3390/met14091034

Koh-ichi Sugimoto, Shoya Shioiri, Junya Kobayashi, Tomohiko Hojo

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引用次数: 0

摘要

在第三代低碳先进超高强度 TRIP 辅助贝氏体铁素体 (TBF)、贝氏体铁素体-马氏体 (TBM) 和马氏体 (TM) 钢中，评估了剪切冲压表层的损伤，如应变硬化、应变诱导马氏体转变和微空洞引发行为。此外，表层损伤还与以下因素有关：（1）剪切冲压过程中产生的平均法向应力；（2）基体结构、残余奥氏体特性和第二相特性等微观结构特性。所有钢材的剪切冲压表面层损伤都是在平均法向应力介于零和负值之间的情况下产生的。TBM 和 TM 钢的表层损伤相对较小。较小的表面层损伤带来了极佳的冷拉伸法兰性能，在扩孔时具有较高的抗裂纹扩展/抗空洞连接性能。

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Evaluation of Shear-Punched Surface Layer Damage in Ultrahigh-Strength TRIP-Aided Steels with Bainitic Ferrite and/or Martensite Matrix Structure

The damage to the shear-punched surface layers such as strain-hardening, strain-induced martensite transformation, and micro-void initiation behaviors was evaluated in the third-generation low-carbon advanced ultrahigh-strength TRIP-aided bainitic ferrite (TBF), bainitic ferrite–martensite (TBM), and martensite (TM) steels. In addition, the surface layer damage was related to (1) the mean normal stress generated during shear-punching and (2) microstructural properties such as the matrix structure, retained austenite characteristics, and second-phase properties. The shear-punched surface layer damage was produced under the mean normal stress between zero and negative in all the steels. The TBM and TM steels achieved relatively small surface layer damage. The small surface layer damage resulted in excellent cold stretch-flangeability, with a high crack-propagation/void-connection resistance on hole expansion.

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来源期刊

Metals MATERIALS SCIENCE, MULTIDISCIPLINARY-METALLURGY & METALLURGICAL ENGINEERING

CiteScore

4.90

自引率

13.80%

发文量

1832

审稿时长

1.5 months

期刊介绍： Metals (ISSN 2075-4701) is an open access journal of related scientific research and technology development. It publishes reviews, regular research papers (articles) and short communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Metals provides a forum for publishing papers which advance the in-depth understanding of the relationship between the structure, the properties or the functions of all kinds of metals.