对接焊缝金属和熔敷金属冲击吸收功差异的探讨  

Difference of impact absorbed energy between butt weld metal and deposited metal

作　　者：果春焕[1] 迟之东[1] 付学满[2] 刘瑞堂 

机构地区：[1]哈尔滨工程大学材料科学与化学工程学院,哈尔滨150001 [2]中国船舶重工集团公司第七二五研究所,河南洛阳471000

出　　处：《焊接学报》2009年第6期99-102,118,共4页Transactions of The China Welding Institution

摘　　要：针对对接焊缝金属和熔敷金属之间的冲击吸收功差异,分别从材料的韧-脆转变温度、成分、组织以及断口方面进行了探讨.结果表明,对接焊缝金属及熔敷金属的韧-脆转变行为存在较大的差异,相同温度下对接焊缝金属的冲击吸收功低于熔敷金属.这主要是因为二者所含的合金元素C和Mn有显著的不同,即元素C含量的增加以及元素Mn含量的减小均提高了对接焊缝金属的韧-脆转变温度;焊道布置的不同,致使对接焊缝金属中的屈氏体含量高于熔敷金属中的含量,从而使得对接焊缝金属容易形成裂纹;并且从断口照片可以看出对接焊缝金属的裂纹稳定扩展的距离相对较小.The ductile-brittle transition temperature,chemical composition,microstructure and fracture of welded metal are investigated to discuss the difference of impact absorbed energy between butt weld and deposited metal.The results indicate that the ductile-brittle transition behavior of the butt weld metal is different from that of the deposited metal,and the impact absorbed energy of the butt weld metal is lower than that of deposited metal under the same temperature.The increase of carbon content and the decrease of manganese content make the ductile-brittle transition temperature of butt weld metal increase.The difference of welding bead distribution between butt welding and deposition welding will cause the content of troostitic structure in butt weld metal higher than that of deposited metal,and the crack in butt weld metal is formed easily.The crack stability extend distance of the butt weld metal is shorter than that of the deposited metal.

关 键 词：冲击吸收功 韧-脆转变温度 对接焊缝 组织 低温冲击韧性 

分 类 号：TG407[金属学及工艺—焊接]