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首页> 外文期刊>Materials Science and Engineering >The influence of niobium on the plastic deformation behaviors of 310s austenitic stainless steel weld metals at different temperatures
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The influence of niobium on the plastic deformation behaviors of 310s austenitic stainless steel weld metals at different temperatures

机译：铌对不同温度下310s奥氏体不锈钢焊缝金属塑性变形行为的影响

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摘要

The deformation behaviors of 310s stainless steel weld metals (WMs) with different Nb contents are investigated under uniaxial tension at temperatures ranging from ambient temperature to 1000 degrees C. The results show that Nb effectively improves the strength of the WMs in the whole test temperatures range. The addition of Nb causes a change in the fractures of the WMs from intergranular brittle fractures to intragranular ductile fractures at elevated temperature. Hence, elemental Nb enhances the elevated temperature plasticity of the WMs. However, as the eutectic Nb(C, N) promotes the nucleation and propagation of the cracks, Nb decreases the elongation of the WMs at temperature below 700 degrees C. With the increase in the deformation temperature, the strength of the WMs decreases monotonously. However, the elongation of the WMs shows a nonmonotonic relationship with the temperatures. The deformation twins can occur at room temperature and improve the strength and elongation of the WMs. Meanwhile, the cracks nucleate around the eutectic Nb(C, N) at 1000 degrees C, leading to the minimum elongation of the Nb-bearing WMs in the whole test temperature range. The differential scanning calorimetry result suggests that the melting of the eutectic Nb(C, N) may be the dominant reason for the nucleation of the cracks and result in the reduction in the elongation of the Nb-bearing WM at 1000 degrees C.
机译：研究了Ns含量不同的310s不锈钢焊缝金属（WMs）在环境温度至1000摄氏度的温度下在单轴拉伸下的变形行为。结果表明，Nb在整个测试温度范围内有效地提高了WMs的强度。在高温下，Nb的添加导致WM的断裂从晶间脆性断裂变为晶内延性断裂。因此，元素Nb增强了WM的高温可塑性。但是，由于共晶Nb（C，N）促进了裂纹的形核和扩展，Nb降低了温度低于700摄氏度时WM的伸长率。随着变形温度的升高，WM的强度单调降低。但是，WM的伸长率与温度呈非单调关系。变形孪晶可在室温下发生，并改善WM的强度和伸长率。同时，裂纹在1000摄氏度时在共晶Nb（C，N）周围成核，从而导致在整个测试温度范围内含Nb的WM的最小伸长率。差示扫描量热法的结果表明，共晶Nb（C，N）的熔化可能是裂纹成核的主要原因，并且导致含Nb的WM在1000摄氏度时的伸长率降低。

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  • 来源
    《Materials Science and Engineering》 |2019年第16期|648-655|共8页
  • 作者

    Zhan Xu; Li Dianzhong; Li Yiyi; Lu Shanping;

  • 作者单位

    Chinese Acad Sci, Key Lab Nucl Mat & Safety Assessment, Inst Met Res, 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;

    Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 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;

    Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    310s austenitic weld metals; Deformation twins; Nb(C N); Temperature dependence; Plasticity;

    机译：310s奥氏体焊接金属;变形孪晶;Nb（C N）;温度依赖性;塑性;

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