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双相不锈钢00Cr25Ni7Mo3表层析出的奥氏体相具有可重复的多种形貌和晶体学特征,与块体材料内部的沉淀现象有显著差异。为探索非均匀约束条件下的相变晶体学规律,应用电子背散射衍射(EBSD)技术对表层沉淀相中主要的针状奥氏体的晶体学特征进行统计表征。统计结果表明,沉淀相倾向于沿表面生长。以在预抛光表面作为不变线方向的约束条件,计算了所有可能出现的不变线。对比实验观察发现,多数表层沉淀相的长轴方向趋向表面内的某一不变线。各不变线之间的晶体学非等价性是表层针状沉淀相取向多样性的成因。
The austenite phase precipitated on the surface of duplex stainless steel 00Cr25Ni7Mo3 has a variety of morphologies and crystallographic features that are repeatable, which are significantly different from those of bulk materials. In order to explore the laws of phase transition crystallography under heterogeneous confinement, the crystallographic characteristics of the major acicular austenite in the precipitated phase were characterized by electron backscatter diffraction (EBSD). The statistical results show that the precipitated phase tends to grow along the surface. With the pre-polished surface as the invariant line constraints, all possible invariant lines were calculated. Comparing the experimental observations, it is found that the major axis direction of most surface sedimentary facies tends to a certain invariant line in the surface. The non-equivalence of crystallography between the invariant lines is the cause of the diversity of orientation of surface acicular precipitates.