Research on application of laser selective melting technology in preparation of non-destructive testing simulated test block and its characterization analysis
ZHANG Liang1,2, TANG Lingtian*1,2, WANG Yujian3, LIU Ming4, WANG Haizhou*1,2
1. Central Iron and Steel Research Institute Co., Ltd., Beijing 100081, China; 2. China NIL Research Center for Proficiency Testing, Beijing 100081, China; 3. TSC Laser Technology Development(Beijing)Co., Ltd., Beijing 102200, China; 4. NCS Testing Technology Co., Ltd., Beijing 100081, China
Abstract：The simulated test blocks for non-destructive testing have important applications in the field of actual flaw detection, but the preparation of test blocks and their defects is difficult. Due to the unique molding process of additive manufacturing, it is possible for free design of defects and machine shaping of test blocks. A simulated test block made of 316L stainless steel for non-destructive testing was prepared by selective laser melting (SLM) additive manufacturing technology. Simulated holes and crack defects with six numerical gradients (aperture sizes ranging from ø0.1 mm to ø0.6 mm) were designed inside the specimens. The results showed that after form the metal powder into test block by the SLM method, the chemical composition had no obvious change. When the defect design aperture was in range of ø0.4 mm-ø0.6 mm, the defect preparation had good repeatability, and the shape was relatively complete. Due to the effect of laser penetration and the phenomenon of melting and sticking of powder in the heat-affected zone during the molding process, the shape accuracy of the defects decreased. The ultrasonic waveform changing information and pattern of the simulated hole and crack defects were consistent with the actual state of the defects. It is feasible to apply SLM technology to the preparation of simulated test blocks for non-destructive testing.
张亮, 唐凌天, 王玉健, 刘明, 王海舟. 激光选区熔化技术应用于无损检测模拟试块制备的研究及试块表征分析[J]. 冶金分析, 2022, 42(11): 15-23.
ZHANG Liang, TANG Lingtian, WANG Yujian, LIU Ming, WANG Haizhou. Research on application of laser selective melting technology in preparation of non-destructive testing simulated test block and its characterization analysis. , 2022, 42(11): 15-23.
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