Abstract 9–12 Cr ferritic/martensitic steel is successfully fabricated using selective electron beam melting (SEBM). The microstructure of as-built components is compared to the ones fabricated by a conventional method, and it is revealed that the SEBM-built components have tempered martensite structure with fine equiaxed prior austenite grains (60.1 ± 8.3 μm) containing thin layers covered by W-rich phases and large fraction (20% over) of sub-blocks corresponding to K-S orientation relationships due to characteristics of SEBM as a rapid solidification process. The SEBM provides a new production method to fabricate heat-resistant components of 9–12 Cr ferritic/martensitic steels with unique microstructure.

中文翻译：

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使用选择性电子束熔化制造 9-12 Cr 铁素体/马氏体钢

摘要 9-12 Cr 铁素体/马氏体钢是使用选择性电子束熔化 (SEBM) 成功制造的。将完工部件的微观结构与通过常规方法制造的部件进行比较，结果表明 SEBM 制造的部件具有回火马氏体结构，细小等轴原始奥氏体晶粒 (60.1 ± 8.3 μm) 包含 W 覆盖的薄层由于 SEBM 作为快速凝固过程的特性，富相和大部分（超过 20%）的子块对应于 KS 取向关系。SEBM 提供了一种新的生产方法来制造具有独特微观结构的 9-12 Cr 铁素体/马氏体钢的耐热部件。