【摘要】：采用超窄間隙坡口和光纖激光填絲多層焊工藝,焊接了50mm厚的SA508Gr.3Cl.2核電用鋼,測(cè)試并分析了接頭的微觀組織和性能。結(jié)果表明,焊接接頭無(wú)宏觀缺陷;熱處理后接頭中部焊縫中心組織主要為上貝氏體和針狀下貝氏體,母材側(cè)熱影響區(qū)的粗晶區(qū)組織為高溫回火馬氏體,硬度為280HV。焊接接頭拉伸試樣的拉伸斷裂位置均位于母材,接頭抗拉性能良好。接頭上、中、下部位的焊縫沖擊韌性均小于母材的,但焊縫沖擊試樣的斷口形貌仍具有一定的韌性斷裂特征。
[Abstract]:The ultra-narrow gap groove and fiber laser wire filling multilayer welding process were used to weld the 50mm thick SA508Gr.3Cl.2 nuclear power steel. The microstructure and properties of the joints were tested and analyzed. The results show that there is no macroscopic defect in the welded joint, the central microstructure of the weld is mainly upper bainite and acicular lower bainite after heat treatment, the coarse grain structure of the heat affected zone of the base metal side is high temperature tempered martensite, and the hardness is 280 HV. The tensile fracture locations of the welded joint tensile specimens are all located in the base metal, and the tensile properties of the joints are good. The impact toughness of weld in the upper, middle and lower parts of the joint is smaller than that of the base metal, but the fracture morphology of the weld impact specimen still has some ductile fracture characteristics.
【作者單位】： 上海交通大學(xué)材料科學(xué)與工程學(xué)院上海市激光制造與材料改性重點(diǎn)實(shí)驗(yàn)室;上海電氣核電設(shè)備有限公司;高新船舶與深海開發(fā)裝備協(xié)同創(chuàng)新中心;
【基金】：國(guó)家科技重大專項(xiàng)(2014ZX06002001) 上海市重大技術(shù)裝備研制專項(xiàng)(ZB-ZBYZ-03-11-0485)
【分類號(hào)】：TG456.7

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