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Role of Nb in low interstitial 13Cr super martensitic stainless steel

机译：Nb在低间隙13Cr超马氏体不锈钢中的作用

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摘要

The effect of adding 0.1 wt% Nb to low interstitial (N 0.01 wt%, C 0.01 wt%) 13Cr super martensitic stainless steel (SMSS) on solid phase transformation and microstructures achieved by normalizing and tempering was investigated using dilatometer, electron backscattered diffraction (EBSD), transmission electron microscope (TEM), X-ray diffraction (XRD), and its consequence on mechanical properties was examined to clarify the role of Nb in low interstitial martensitic stainless steel. Nb was found to retard kinetics of reversed austenite formation during tempering and to suppress the occurrence of Cr rich precipitates. The measurement of mechanical properties shows that while the strength properties were significantly increased by nano-scale precipitates enriched in Nb in the steel with 0.10 wt% Nb, the ductility and toughness properties were restored by optimum volume fraction of retained austenite. Excellent strength and adequate toughness properties were obtained by tempering the steel with 0.10 wt% Nb and low interstitial (N 0.01 wt%, C 0.01 wr%) steel at 600 ℃.
机译：研究了使用膨胀计，电子背散射衍射法研究了向低间隙（N 0.01 wt％，C 0.01 wt％）13Cr超级马氏体不锈钢（SMSS）中添加0.1 wt％Nb对固相转变和通过正火和回火实现的显微组织的影响（ EBSD），透射电子显微镜（TEM），X射线衍射（XRD）及其对机械性能的影响，以阐明Nb在低间隙马氏体不锈钢中的作用。发现Nb会阻碍回火过程中奥氏体形成的动力学，并抑制富Cr沉淀的出现。力学性能的测量表明，尽管通过添加0.10％（重量）Nb的钢中富含Nb的纳米级析出物可以显着提高强度性能，但通过保留奥氏体的最佳体积分数可以恢复延展性和韧性。通过用0.10 wt％的Nb和低间隙（N 0.01 wt％，C 0.01 wr％）钢在600℃进行回火，可以获得优异的强度和足够的韧性。

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