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论文类型：期刊论文

发表时间：2017-01-01

发表刊物：JOURNAL OF MANUFACTURING PROCESSES

收录刊物：SCIE、EI

卷号：25

页面范围：220-226

ISSN号：1526-6125

关键字：Pulsed laser; Dissimilar welding; Element distribution; Mechanical property

摘要：To evaluate the effects of pulsed laser welding on the microstructure characteristics and mechanical properties of nickel-based superalloy (C-276) and austenitic stainless steel (304) lap-welded joint, the analyses of morphology, microstructure, phase structure, element distribution, tensile-shear strength and microhardness were carried out. The results indicated the unmixed zone was found at the interface between the weld metal (WM) and 304. A small number of inter-dendritic precipitates were also found, and the precipitates were most probably p or mu phases. Compared with the phase structure in C-276, the dominated phase structure in the WM was also austenite phase, however, the lattice constant was reduced due to the decrease of Ni, Mo and W content. The macro-element distribution was inhomogeneous in the WM due to the rapid cooling rate in pulsed laser welding, and the element transition region adjacent to C-276 was wider than that adjacent to 304. The fracture mode of lap-welded joint in tensile-shear test was tensile fracture, and the tensile strength was decreased by 17% compared with that of C-276. The microhardness value in the WM was not lower than that in the base metals. (C) 2016 The Society of Manufacturing Engineers. Published by Elsevier Ltd. All rights reserved.