In order to overcome constraints related to crack formation during additive processing (laser powder bed fusion, L-BPF) of Fe-Mn-Al-Ni, the potential of high-temperature L-PBF processing was investigated in the present study. The effect of the process parameters on crack formation, grain structure, and phase distribution in the as-built condition, as well as in the course of cyclic heat treatment was examined by microstructural analysis. Optimized processing parameters were applied to fabricate cylindrical samples featuring a crack-free and columnar grained microstructure. In the course of cyclic heat treatment, abnormal grain growth (AGG) sets in, eventually promoting the evolution of a bamboo like microstructure. Testing under tensile load revealed a well-defined stress plateau and reversible strains of up to 4%.

中文翻译：

---

Fe-Mn-Al-Ni形状记忆合金的激光粉末床熔合工艺—对平台温度升高的影响

为了克服与Fe-Mn-Al-Ni的附加加工（激光粉末床熔合，L-BPF）过程中裂纹形成有关的限制，本研究对高温L-PBF加工的潜力进行了研究。通过微观结构分析，考察了工艺参数对初生条件下以及循环热处理过程中裂纹形成，晶粒结构和相分布的影响。将优化的加工参数应用于制造具有无裂纹和圆柱状晶粒微结构的圆柱形样品。在循环热处理过程中，出现异常晶粒生长（AGG），最终促进了竹样微结构的演变。在拉伸载荷下的测试显示出明确的应力平稳期和高达4％的可逆应变。