The compositions and crystal orientations of complex nuclei in an industrial Ti and Nb stabilized ferritic stainless steel (FSS) with a high equiaxed zone ratio were investigated to evaluate the nucleation efficiency of (Ti,Nb)(CN) on the surface of oxides. Although the thermodynamic analysis showed that the equilibrium oxide is Ti 2 O 3 , two other types of oxides mainly composed of MgAl 2 O 4 were found in the complex nucleus. In addition, the oxide with the lowest melting temperature was found to have the smallest size. The crystal orientation relationships among MgAl 2 O 4 , Ti 2 O 3 and (Ti,Nb)(CN) were revealed by the application of micro-area EBSD measurement after argon ion polishing (AIP) treatment. The crystal planes and crystal orientations of the MgAl 2 O 4 are found to be completely parallel to (Ti,Nb)(CN). In the complex nucleus dominated by Ti 2 O 3 , it was found that {001}Ti 2 O 3 is parallel to {111}(Ti,Nb)(CN) and {100}Ti 2 O 3 is parallel to {110}(Ti,Nb)(CN). According to these orientation relationships, Ti 2 O 3 was calculated to have a much lower disregistry with (Ti,Nb)(CN) than MgAl 2 O 4 . In addition, it was also revealed by orientation relationships that (Ti,Nb)(CN) has great potential for the nucleation of δ-Fe.

中文翻译：

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通过 EBSD 测量揭示的氧化物成分对 Ti 和 Nb 稳定铁素体不锈钢复合核中取向关系和失配的影响

研究了具有高等轴区比的工业 Ti 和 Nb 稳定铁素体不锈钢 (FSS) 中复杂核的组成和晶体取向，以评估 (Ti,Nb)(CN) 在氧化物表面的形核效率。虽然热力学分析表明平衡氧化物是Ti 2 O 3 ，但在复合核中发现了另外两种主要由MgAl 2 O 4 组成的氧化物。此外，发现具有最低熔化温度的氧化物具有最小的尺寸。通过氩离子抛光（AIP）处理后的微区EBSD测量，揭示了MgAl 2 O 4 、Ti 2 O 3 和(Ti,Nb)(CN)之间的晶体取向关系。发现MgAl 2 O 4 的晶面和晶体取向完全平行于(Ti,Nb)(CN)。在以Ti 2 O 3 为主的复核中，发现{001}Ti 2 O 3 平行于{111}(Ti,Nb)(CN)，{100}Ti 2 O 3 平行于{110} (Ti,Nb)(CN)。根据这些取向关系，计算出 Ti 2 O 3 与 (Ti,Nb)(CN) 的配准性比 MgAl 2 O 4 低得多。此外，取向关系还表明，(Ti,Nb)(CN)具有很大的δ-Fe成核潜力。