The powder‐bed additive manufacturing (AM) technology electron beam melting (EBM) is suitable for the production of metallic components with complex geometries. Therefore, it is an appropriate method of generating lightweight structures to save material and energy, which is of high importance for the transport industry. The microstructure of additive manufactured materials is usually characterized by columnar grains shape, oriented along the building direction. Therefore, the mechanical properties are strongly affected by anisotropy. Herein, the synthesis and the microstructure of CrMnNi transformation‐induced plasticity (TRIP) steel by EBM is examined. This steel is well suited for AM due to the formation of fine‐grained microstructure instead of columnar one through multiple‐phase transformations. Square‐celled honeycomb structures are produced and improved to generate damage‐tolerant struts. The removal of slightly sintered powder from the cavities of square‐celled structures is quantified. Out‐of‐plane compression tests at quasistatic loading rates show that the strength of honeycomb structures rises with increasing energy input during EBM due to lower material porosity. Therefore, an enhanced mechanical energy absorption capacity is achieved which is favorable for the production of cellular structures.

中文翻译：

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电子束熔化产生的方孔TRIP钢蜂窝结构的微观结构和力学特性

粉末床增材制造（AM）技术电子束熔化（EBM）适用于生产具有复杂几何形状的金属部件。因此，这是一种产生轻质结构以节省材料和能源的合适方法，这对于运输行业而言非常重要。增材制造材料的微观结构通常以沿建筑方向取向的圆柱状颗粒为特征。因此，机械性能受到各向异性的强烈影响。在此，研究了EBM的CrMnNi相变诱导塑性（TRIP）钢的合成和显微组织。这种钢由于形成了细晶粒的微观结构，而不是经过多相转变的圆柱状组织，因此非常适合于增材制造。生产并改进了方孔蜂窝结构，以产生耐损伤的支柱。量化从方孔结构腔中除去的轻微烧结粉末。在准静态加载速率下的平面外压缩测试表明，由于材料孔隙率较低，蜂窝结构的强度随着EBM期间能量输入的增加而增加。因此，实现了增强的机械能吸收能力，这对于制造蜂窝状结构是有利的。