激光选区熔化技术在钴基高温合金制备中的应用进展

钴基高温合金是一种具有较高强度以及良好的耐热腐蚀性能的材料,在生物医疗、航空航天等领域有着广泛的应用。近年来以激光选区熔化技术(selective laser melting, SLM)为代表的增材制造技术快速发展。介绍了SLM技术在钴基高温合金制备中的应用,综述了在SLM过程中不同工艺参数对样品致密度、粗糙度等力学性能的影响,探讨了成形样品是否需要后处理以及后处理所带来的影响等。

Progress on application of selective laser melting in preparation of cobalt-based superalloy

The Cobalt-based superalloy enjoys a high strength and a good heat and corrosion resistance, with a wide range of applications in biomedicine, aerospace and other fields. In recent years, the rapid development of the additive manufacturing technology represented by the selective laser melting technology (SLM) has provided new possibilities for the processing and the application of high-temperature alloys such as the cobalt-based superalloys. Compared with the traditional processing methods, the additive manufacturing technology has many advantages, such as the customization, the fairly easy processing of complex structural parts and the short manufacturing cycle. This paper reviews the applications of the selective laser melting (SLM) technology in the preparation of the cobalt-based superalloys, as well as the tests for the density and mechanical properties, and the influence of the process parameters on the density, the hardness and other mechanical properties such as the roughness, the tensile strength. In order to meet the actual use demand, the postprocessing might be needed and the influence of the postprocessing should be considered.