Increased Crack Resistance to Enhance Toughness in 20Si2MnCrNi Steel via Isothermal Bainite Formation

IF 2.5 3区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

steel research international Pub Date : 2025-02-10 DOI:10.1002/srin.202400974

Xinyu Cai, Yuan Hou, Xiufeng Fan, Zhongwang Wu, Zhanyong Gao

引用次数: 0

Abstract

This work investigates the influence of microstructure of isothermal bainite and as-tempered martensite in 20Si2MnCrNi steel on the toughness and crack propagation behavior. The results show that the impact absorption energy of the steel with isothermal bainite microstructure (211 J) is nearly double that of as-tempered martensite (116.3 J), while the crack propagation rate is reduced by ≈15%. The superior toughness of isothermal bainite is largely attributed to the presence of high-angle grain boundaries, which account for 82.3% of the total, compared to 62.6% in tempered martensite. These boundaries effectively deflect and branch cracks, thereby enhancing crack resistance and material durability.

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通过等温贝氏体形成提高20Si2MnCrNi钢的抗裂性以增强韧性

研究了20Si2MnCrNi钢等温贝氏体和回火马氏体组织对韧性和裂纹扩展行为的影响。结果表明：等温贝氏体组织（211 J）钢的冲击吸收能几乎是回火马氏体（116.3 J）钢的两倍，而裂纹扩展速率降低了约15%；等温贝氏体的高角度晶界占82.3%，而回火马氏体的高角度晶界占62.6%。这些边界有效地偏转和分支裂缝，从而提高抗裂性和材料耐久性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

steel research international 工程技术-冶金工程

CiteScore

3.30

自引率

18.20%

发文量

319

审稿时长

1.9 months

期刊介绍： steel research international is a journal providing a forum for the publication of high-quality manuscripts in areas ranging from process metallurgy and metal forming to materials engineering as well as process control and testing. The emphasis is on steel and on materials involved in steelmaking and the processing of steel, such as refractories and slags. steel research international welcomes manuscripts describing basic scientific research as well as industrial research. The journal received a further increased, record-high Impact Factor of 1.522 (2018 Journal Impact Factor, Journal Citation Reports (Clarivate Analytics, 2019)). The journal was formerly well known as "Archiv für das Eisenhüttenwesen" and "steel research"; with effect from January 1, 2006, the former "Scandinavian Journal of Metallurgy" merged with Steel Research International. Hot Topics: -Steels for Automotive Applications -High-strength Steels -Sustainable steelmaking -Interstitially Alloyed Steels -Electromagnetic Processing of Metals -High Speed Forming