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Impact of Al addition on deformation behavior of Fe-Cr-Ni-Mn-C austenitic stainless steel

机译：Al加法对Fe-Cr-Ni-Mn-C奥氏体不锈钢变形行为的影响

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摘要

The influence of Al on the temperature dependence of deformation mechanisms in metastable austenitic stainless steels was investigated by tensile tests in the temperature range of -196 - 300 °C. The deformed microstructures of the Al-free and Al-added steels at -140 °C consisted of planar glide features such as deformation-induced α'-martensite and deformation twins, with a larger fraction of α'-martensite in the Al-free steel. The formation of α'-martensite was mediated by deformation twins. The delayed kinetics of α'-martensite formation in the Al-added steel implies an increase in the stacking fault energy upon Al addition. This was also supported by the higher work hardening rate of the Al-free steel at deformation temperatures up to 150 °C. The work hardening rates at 300 °C were influenced by the dynamic strain aging. The more pronounced dynamic strain aging in the Al-added steel caused a higher work hardening rate compared to the Al-free steel. According to the tensile test results, the addition of Al caused a shift in the curves representing the temperature dependence of tensile elongation and tensile strength to lower temperatures. For the Al-free steel, the temperature associated with the maximum tensile elongation almost exactly coincided with the M_d~(γ→α') temperature, namely an immediate deterioration of tensile elongation occurred upon the α'-martensite formation. For the Al-added steel, on the other hand, the maximum tensile elongation was achieved at a temperature well below its respective M_d~(γ→α') temperature. This indicates an enhancement of tensile elongation in spite of the deformation-induced α'-martensite formation. Since deformation-induced micro-mechanisms in both steels were quite similar, the difference in the sensitivity of steels to the deformation-induced α'-martensite formation was interpreted in terms of an inhomogeneous distribution of alloying elements and local variations in the stacking fault energy and deformation-induced micro-mechanisms.
机译：通过拉伸试验在-196-300℃的温度范围内研究了Al对变形机制温度依赖性对亚稳奥氏体不锈钢的影响。 -140℃的无铝和Al-添加钢的变形微观结构包括平面滑动特征，例如变形诱导的α'''''''''-martensite和变形双胞胎，在不含al的α'-martensite的较大部分钢。 α'-martensite的形成是通过变形双胞胎介导的。 Al-添加钢中α'-martensite的延迟动力学意味着在Al添加时堆叠故障能量增加。这也得到了钢的变形温度高达150℃的不变钢的较高工作硬化速率。 300℃的工作淬火率受动态应变老化的影响。与自由钢相比，Al-add钢中更明显的动态应变老化引起了更高的工作加固率。根据拉伸试验结果，加入Al导致表示曲线的偏移，表示拉伸伸长率和拉伸强度的温度依赖性降低温度。对于自由钢，与最大拉伸伸长率相关的温度几乎与M_D〜（γ→α'）温度完全一致，即在α'-马氏体形成时立即发生拉伸伸长率的劣化。另一方面，对于Al-加入的钢，在低于其各自的M_D〜（γ→α'）温度下的温度下实现了最大拉伸伸长率。这表明尽管诱导了α'-马氏体形成，但仍然可以提高拉伸伸长率。由于两个钢中的变形诱导的微机制非常相似，因此在合金元素的不均匀分布和堆叠故障能量中的局部变化的角度来解释钢对变形诱导的α'''-马氏体形成的敏感性的差异和变形诱导的微机制。

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  • 来源
    《Materials Science and Engineering》 |2020年第21期|140084.1-140084.13|共13页
  • 作者

    Guanghui Chen; Reza Rahimi; Guang Xu; Horst Biermann; Javad Mola;

  • 作者单位

    Materiab Design and Structural Integrity Laboratory Faculty of Engineering and Computer Sciences Osnabriick University of Applied Sciences 49076 Osnabruck Germany The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and Technology 430081 Wuhan China;

    Formerly with Institute of Iron and Steel Technology Technische Universitat Bergakademie Freiberg 09599 Freiberg Germany;

    The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and Technology 430081 Wuhan China;

    Institute of Materials Engineering Technische Universitat Bergakademie Freiberg 09599 Freiberg Germany;

    Materiab Design and Structural Integrity Laboratory Faculty of Engineering and Computer Sciences Osnabriick University of Applied Sciences 49076 Osnabruck Germany;

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  • 正文语种 eng
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  • 关键词

    Lightweight steel; Austenitic stainless steel; Al addition; Mechanical properties; Deformation mechanisms; Solidification mode;

    机译：轻型钢;奥氏体不锈钢;Al Afft;机械性能;变形机制;凝固模式;

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