Ferrous Alloy Department, Advanced Metallic Materials Division, Korea Institute of Materials Science, 797 Changwondaero, Changwon 642-831, South Korea.
Microsc Microanal. 2013 Aug;19 Suppl 5:77-82. doi: 10.1017/S1431927613012385.
Scale-bridging analysis on deformation behavior of high-nitrogen austenitic Fe-18Cr-10Mn-(0.39 and 0.69)N steels was performed by neutron diffraction, electron backscattered diffraction (EBSD), and transmission electron microscopy (TEM). Two important modes of deformation were identified depending on the nitrogen content: deformation twinning in the 0.69 N alloy and strain-induced martensitic transformation in the 0.39 N alloy. The phase fraction and deformation faulting probabilities were evaluated based on analyses of peak shift and asymmetry of neutron diffraction profiles. Semi in situ EBSD measurement was performed to investigate the orientation dependence of deformation microstructure and it showed that the variants of ε martensite as well as twin showed strong orientation dependence with respect to tensile axis. TEM observation showed that deformation twin with a {111} mathematical left angle bracket 112 mathematical right angle bracket crystallographic component was predominant in the 0.69 N alloy whereas two types of strain-induced martensites (ε and α' martensites) were observed in the 0.39 N alloy. It can be concluded that scale-bridging analysis using neutron diffraction, EBSD, and TEM can yield a comprehensive understanding of the deformation mechanism of nitrogen-alloyed austenitic steels.
通过中子衍射、电子背散射衍射（EBSD）和透射电子显微镜（TEM）对高氮奥氏体 Fe-18Cr-10Mn-（0.39 和 0.69）N 钢的变形行为进行了跨标度分析。根据氮含量的不同，确定了两种重要的变形模式：0.69N 合金中的变形孪晶和 0.39N 合金中的应变诱导马氏体相变。基于峰位移和中子衍射谱不对称性的分析，评估了相分数和变形位错概率。进行了半原位 EBSD 测量，以研究变形微观结构的取向依赖性，结果表明ε马氏体变体以及孪晶的变体强烈依赖于拉伸轴的取向。TEM 观察表明，在 0.69N 合金中主要存在具有{111}<112>晶体学分量的变形孪晶，而在 0.39N 合金中观察到两种类型的应变诱导马氏体（ε和α'马氏体）。可以得出结论，使用中子衍射、EBSD 和 TEM 的跨标度分析可以全面了解含氮奥氏体钢的变形机制。
