Heat Input Effect of Selective Laser Melting on Microstructure and Performance of the Layer Deposited by Inconel718
QIN Xiang1, YANG Jun1,2, ZOU Dening1,2, XIE Yanxiang3
1 School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China; 2 Shaanxi Key Laboratory of Gold and Resources, Xi’an University of Architecture and Technology, Xi’an 710055, China; 3 Shaanxi Key Laboratory of Surface Engineering and Remanufacturing, Xi’an University, Xi’an 710065, China
Abstract: The Inconel718 coating was formed on 55Mn2 steel by selective laser melting (SLM). The effects of laser line energy density on the surface microstructure, relative density, microhardness of coating and shear strength between the coating and the substrate were systematically studied. The results showed that with the increase of laser line energy density, the number of spherical particles on the surface of the coating decreased due to nodulizing phenomenon. The internal precipitated δ phase refined gradually and the columnar crystal evenly distributed. The internal structure density and microhardness of the coating increased gradually with the increase of the laser line energy density. The density and the microhardness reached 99.6% and 428.6HV0.2 when the line energy density was 357.14 J/m. The fracture morphology of the coating and the matrix displayed a ductile fracture mode, and the shear strength in the experimental parameter range was 1.9 to 2.15 times of the matrix. The results provide an experimental and theoretical basis on repairing and strengthening the roll surface by selective laser melting.
秦翔, 杨军, 邹德宁, 谢燕翔. 选区激光熔化线能量对Inconel718涂层组织结构及性能的影响[J]. 材料导报, 2020, 34(4): 4093-4097.
QIN Xiang, YANG Jun, ZOU Dening, XIE Yanxiang. Heat Input Effect of Selective Laser Melting on Microstructure and Performance of the Layer Deposited by Inconel718. Materials Reports, 2020, 34(4): 4093-4097.
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2020, Vol. 34 
