Nickel-based alloy/austenitic stainless steel dissimilar weld properties prediction on asymmetric distribution of laser energy

• Published in: Optics and laser technology Vol. 81; pp. 33 - 39
• Main Authors: Zhou, Siyu, Ma, Guangyi, Chai, Dongsheng, Niu, Fangyong, Dong, Jinfei, Wu, Dongjiang, Zou, Helin
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.07.2016
• Subjects: Austenitic stainless steels; Corrosion resistance; Element distribution; Energy asymmetric distribution; Laser beam welding; Laser welding; Levers; Mathematical models; Nickel base alloys; Polynomials; Property prediction; Superalloys; Welded joints; Energy asymmetric distribution; Laser welding; Element distribution; Property prediction
• ISSN: 0030-3992; 1879-2545
• DOI: 10.1016/j.optlastec.2016.01.017

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 Cweld 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 γ phase in each weld, the δ-ferrite phase formation was inhibited and the intermetallic phase (P, μ) formation was promoted with the increase of EC-276. The ultimate tensile strength σb 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 I 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. •A weld properties prediction method based on energy offset ratio EC-276 is proposed.•Element distribution Cweld and EC-276 accorded with the lever rule.•Ultimate tensile strength and corrosion resistance could be predicted by EC-276.•Ultimate tensile strength, corrosion resistance and EC-276 meet cubic polynomials.•Mechanical property and corrosion resistance are mainly influenced by element Mo.