Abstract
Due to the existence of strengthening alloying elements in nickel-base superalloys, welding is quite difficult and the mechanical properties of the welding seam usually decrease significantly compared to the corresponding base materials. In this paper, a study on laser welding of nickel-base superalloys was carried out, and the as-welded samples were treated with mechanical (Rolling) and heat treatment, and the structures and mechanical properties after treatment were investigated. It was found that before any treatment, the fusion line was obviously observed between the welding seam and base materials, and few heat affected zone was found. After rolling treatment, the tensile properties of as-welded samples were close to the base materials. Aging and solid solution treatment can improve the mechanical properties of welding seams significantly. It was indicated that aging treatment could result in the formation of plenty of TiCN precipitates in welding seams, which could be helpful for strengthening the welding seams.
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