Abstract Selective Laser Melting (SLM) is an additive manufacturing technology commonly applied for direct fabrication of complex-shaped parts from metal powders. In the current paper encapsulated hot isostatic pressing (HIP) is applied to improve the structure and mechanical properties of the NiAl intermetallic alloy part produced by SLM. It was found that HIP treatment of SLM samples consolidated the material, eliminated the cracks, and significantly reduced the porosity. Mechanical properties of the HIPed SLM samples at different temperatures were also tested and compared with the properties of cast and powder sintered samples. Compression tests of the SLM samples after HIP showed that the yield strength decreased from 750 MPa to 260 MPa if the temperature increases from 700 °C to 1100 °C correspondingly. Besides significant structure improvement, the yield strength of SLM samples after HIP still about 25% and 15% lower than for the cast and powder sintered samples correspondingly in the tested temperature range.

中文翻译：

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热等静压对激光选区熔化金属间化合物NiAl-Cr-Mo合金组织和性能的影响

摘要 选择性激光熔化（SLM）是一种增材制造技术，常用于直接用金属粉末制造复杂形状的零件。在目前的论文中，采用封装热等静压 (HIP) 来改善 SLM 生产的 NiAl 金属间合金零件的结构和机械性能。结果表明，SLM 样品的 HIP 处理使材料固结，消除了裂纹，并显着降低了孔隙率。还测试了 HIPed SLM 样品在不同温度下的机械性能，并与铸造和粉末烧结样品的性能进行了比较。HIP 后 SLM 样品的压缩试验表明，如果温度相应地从 700°C 增加到 1100°C，屈服强度从 750 MPa 降低到 260 MPa。