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首页> 外文期刊>Materials Science and Engineering >Influence of the decomposition behavior of retained austenite during tempering on the mechanical properties of 2.25Cr-1Mo-0.25 V steel
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Influence of the decomposition behavior of retained austenite during tempering on the mechanical properties of 2.25Cr-1Mo-0.25 V steel

机译：回火过程中残余奥氏体的分解行为对2.25Cr-1Mo-0.25 V钢力学性能的影响

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摘要

The as-quenched microstructure of 2.25Cr-1Mo-0.25 V steel heavy forgings is granular bainite, which is composed of bainitic ferrite and blocky islands of martensite and retained austenite (RA). In this study, the characteristics of RA decomposition and its effects on the mechanical properties of the steel are investigated. The results show that RA decomposes into a cluster of coarse M23C6 carbides and ferrite during standard tempering at 700 degrees C. These coarse carbides decorate the boundary of the cluster, thus deteriorating the impact toughness of the steel. Accordingly, the size and distribution of these carbides are tentatively modified by introducing pre-tempering at different temperatures ranging from 180 degrees to 650 degrees C before the standard tempering at 700 degrees C. This is because during pre-tempering, RA first decomposes into various transitional microstructures such as martensite, bainite or pearlite, which further transform into M23C6 carbide clusters during the subsequent 700 degrees C tempering. The experimental results show that 455 degrees C is the optimal pre-tempering temperature to improve the impact toughness of the steel after the 700 degrees C tempering. Microstructural observations reveal that during the 455 degrees C pretempering step, the RA completely decomposes into bainite consisting of fine bainitic packets and a high density of M3C carbides, which provide additional nucleation sites for M23C6 carbides inside the carbide clusters during the subsequent 700 degrees C tempering, and thus avoid the formation of coarse M23C6 distributed along carbide cluster boundaries.
机译：2.25Cr-1Mo-0.25 V钢重型锻件的淬火组织为粒状贝氏体，由贝氏体铁素体，马氏体块状岛和残余奥氏体（RA）组成。在这项研究中，研究了RA分解的特性及其对钢力学性能的影响。结果表明，在700摄氏度的标准回火过程中，RA分解为M23C6粗大碳化物和铁素体簇。这些粗碳化物装饰了簇的边界，从而降低了钢的冲击韧性。因此，在700℃的标准回火之前，通过在180℃至650℃的不同温度下引入预回火来暂时改变这些碳化物的尺寸和分布。这是因为在预回火期间，RA首先分解成各种过渡组织，例如马氏体，贝氏体或珠光体，在随后的700℃回火过程中会进一步转变为M23C6碳化物簇。实验结果表明，455℃是提高700℃回火后钢的冲击韧性的最佳预回火温度。显微组织观察表明，在455摄氏度的预回火步骤中，RA完全分解为贝氏体，该贝氏体由细小的贝氏体小包和高密度的M3C碳化物组成，这为随后的700摄氏度回火过程中的碳化物簇内的M23C6碳化物提供了额外的成核点。 ，从而避免形成沿碳化物簇边界分布的粗M23C6。

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  • 来源
    《Materials Science and Engineering》 |2019年第10期|540-552|共13页
  • 作者

    Jiang Zhonghua; Wang Pei; Li Dianzhong; Li Yiyi;

  • 作者单位

    Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China|Univ Sci & Technol China, Sch Mat Sci & Engn, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China;

    Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China|Univ Sci & Technol China, Sch Mat Sci & Engn, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China;

    Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China|Univ Sci & Technol China, Sch Mat Sci & Engn, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China;

    Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China|Univ Sci & Technol China, Sch Mat Sci & Engn, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China;

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  • 关键词

    Granular bainite steel; Retained austenite; Pre-tempering; Carbide cluster; Mechanical properties;

    机译：贝氏体颗粒钢;残余奥氏体;回火;硬质合金;力学性能;

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