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Indexed by:期刊论文

Date of Publication:2016-07-01

Journal:OPTICS AND LASER TECHNOLOGY

Included Journals:SCIE、EI

Volume:81

Page Number:33-39

ISSN No.:0030-3992

Key Words:Laser welding; Energy asymmetric distribution; Element distribution; Property prediction

Abstract:A properties prediction method of Nickel-based alloy (C-276)/austenitic stainless steel (304) dissimilar weld was proposed and validated based on the asymmetric distribution of laser energy. Via the dilution level DC-276 (the ratio of the melted C-276 alloy), the relations between the weld properties and the energy offset ratio EC-276 (the ratio of the irradiated energy on the C-276 alloy) were built, and the effects of EC-276 on the microstructure, mechanical properties and corrosion resistance of dissimilar welds were analyzed. The element distribution C-weld and EC-276 accorded with the lever rule due to the strong convention of the molten pool. Based on the lever rule, it could be predicted that the microstructure mostly consists of gamma phase in each weld, the delta-ferrite phase formation was inhibited and the intermetallic phase (P, mu) formation was promoted with the increase of EC-276. The ultimate tensile strength sigma(b) of the weld joint could be predicted by the monotonically increasing cubic polynomial model stemming from the strengthening of elements Mo and W. The corrosion potential U, corrosion current density 1 in the active region and EC-276 also met the cubic polynomial equations, and the corrosion resistance of the dissimilar weld was enhanced with the increasing EC-276, mainly because the element Mo could help form a steady passive film which will resist the Cl- ingress. (C) 2016 Elsevier Ltd. All rights reserved.