Simultaneous Improvement of Toughness and Fatigue Life in a Typical Ultrahigh Strength Steel by a New Deep Cryogenic Treatment Process

Peng GUO; Lei DENG; Xinyun WANG; Junsong JIN

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Simultaneous Improvement of Toughness and Fatigue Life in a Typical Ultrahigh Strength Steel by a New Deep Cryogenic Treatment Process

机译：一种新的深层低温处理过程同时改善典型的超高强度钢中的韧性和疲劳寿命

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As a supplemental process of heat treatment, deep cryogenic treatment (DCT) is believed to have favorable effects on the mechanical properties of steels. In this study, three different sequences of DCT and tempering, including QCTT (Q: quenching, C: DCT, T: tempering), QTC, and QTCT, were investigated to discover an effective method to improve the impact toughness and fatigue life of a typical ultrahigh strength steel simultaneously. Compared with the traditional heat treatment process, the impact toughness, fracture elongation, and fatigue life were improved by 10%, 17.8%, and 13.7%, respectively, after the QTC treatment process. The microstructures were characterized by scanning electron microscope (SEM), electron backscatter diffraction (EBSD), transmission electron microscopy (TEM), and electron probe micro-analysis (EPMA). The results indicate that after QTC process, the formation of cracks was restricted due to the decrease of carbides and disappear of twinned martensite, both of which would serve as the sources of cracks. Besides, the propagation of cracks is hindered because the decrease of blocky retained austenite and increase of filmy retained austenite. As a result, the impact toughness, fracture elongation and fatigue life are improved simultaneously. This work provides a new and effective method to simultaneously improve the toughness and fatigue life of ultrahigh strength steels.

机译：作为热处理的补充过程，据信深冷冻处理（DCT）对钢的机械性能有利。在这项研究中，研究了三种不同的DCT和回火序列，包括QCTT（Q：淬火，C：DCT，T：回火），QTC和QTCT，以发现一种有效的方法来改善A的冲击韧性和疲劳寿命典型的超高强度钢同时。与传统的热处理过程相比，在QTC处理过程后，分别提高了10％，17.8％和13.7％的冲击韧性，骨折伸长率和疲劳寿命。通过扫描电子显微镜（SEM），电子反向散射衍射（EBSD），透射电子显微镜（TEM）和电子探针微分析（EPMA）来表征微结构。结果表明，在QTC过程之后，由于碳化物的降低和孪生马氏体消失，裂缝的形成受到限制，两者都可以作为裂缝的来源。此外，裂缝的繁殖受阻，因为嵌段保留奥氏体的降低和薄膜保留奥氏体的增加。结果，同时改善冲击韧性，断裂伸长和疲劳寿命。这项工作提供了一种新的有效方法，可同时提高超高强度钢的韧性和疲劳寿命。

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来源
《ISIJ international》 |2021年第1期|463-472|共10页
作者
Peng GUO; Lei DENG; Xinyun WANG; Junsong JIN;
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作者单位

State Key Laboratory of Materials Processing and Die & Mould Technology Huazhong University of Science and Technology 1037 Luoyu Road Wuhan Hubei 430074 China;

State Key Laboratory of Materials Processing and Die & Mould Technology Huazhong University of Science and Technology 1037 Luoyu Road Wuhan Hubei 430074 China;

State Key Laboratory of Materials Processing and Die & Mould Technology Huazhong University of Science and Technology 1037 Luoyu Road Wuhan Hubei 430074 China;

State Key Laboratory of Materials Processing and Die & Mould Technology Huazhong University of Science and Technology 1037 Luoyu Road Wuhan Hubei 430074 China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种 eng
中图分类
关键词
deep cryogenic treatment; toughness; fatigue life; retained austenite; carbides;

机译：深冷冻处理;韧性;疲劳生活;保留奥氏体;碳化物;

Simultaneous Improvement of Toughness and Fatigue Life in a Typical Ultrahigh Strength Steel by a New Deep Cryogenic Treatment Process

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