(1. 天津大學(xué) 材料科學(xué)與工程學(xué)院，天津 300072；
2. 高新船舶與深海開發(fā)裝備協(xié)同創(chuàng)新中心，上海 200240)
摘 要: 對3.0 mm厚的Inconel 601鎳基合金激光焊后焊接接頭的顯微組織進行研究。結(jié)果表明：凝固后焊縫金屬仍呈奧氏體相，其相組成由奧氏體基體γ相、γ′相(Ni3Al為主)以及碳化物相(Cr23C6)組成。同時，熔池金屬以交互結(jié)晶的方式優(yōu)先依附在半熔化狀態(tài)的母材晶粒表面生長。另外，在焊縫金屬中觀察到以胞狀和樹枝狀為主的亞結(jié)構(gòu)，亞結(jié)構(gòu)中存在凝固亞晶界、凝固晶粒邊界和遷移晶粒邊界。
關(guān)鍵字: Inconel 601合金；鎳基高溫合金；激光焊；亞結(jié)構(gòu)；顯微組織
（1. School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China;
2. Collaborative Innovation Center of Advanced Ship and Deep-Sea Exploration, Shanghai 200240, China）
Abstract:The welded joint microstructure of 3.0 mm-thickness Inconel 601 superalloy was analyzed. The results show that the phase composition of the welded joint consists of austenite matrix γ phase, γ′ phase (Ni3Al-based) and carbide phase (Cr23C6), which is similar with the metal phase composition. And the molten pool metal grows up in the form of interaction crystallization, which is prior to attach to the semi-molten state of the metal surface. The cellular and dendritic substructures are observed in the welded joint microstructures. Solidification sub-grain boundary (SSGB), solidification grain boundary (SGB) and migrated grain boundary (MGB) exist in the substructure.
Key words: Inconel 601 alloy; nickel-based superalloy; laser welding; substructure; microstructure
