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摘要
Selective laser melting (SLM) is a typical additive manufacturing technology. In this paper, the fundamental principle of the SLM technology is explained first. Subsequently, the categories of the processing parameters of SLM and their effects on the quality of printed specimens are analyzed and summarized, focusing on the categories of defects probably produced during the printing process. The cause of formation of each defect is discussed and explained. In metal specimens prepared by SLM, two types of detects, namely, microstructural and non-microstructural defects, are usually observed. The former includes pores, porosity, unfused defects, cracks, high density inclusions, and the anisotropy of the microstructure, whereas the latter includes spheroidization, residual stress, warping deformation, and geometric errors. Finally, the types and scope of application of nondestructive testing (NDT) technologies for microstructural defects are summarized, and the prospects for the development of NDT are presented. ? 2023 Cailiao Daobaoshe/ Materials Review.
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