焊接方法对9Ni钢焊接接头组织及低温韧性的影响  

Effect of Welding Methods on Microstructure and Low-temperature Impact Toughness of Welded Joint of 9Ni Steel

作　　者：孟根巴根[1,2] 林文光[1] 马成勇[2] 彭云[2] 田志凌[2] 

机构地区：[1]内蒙古工业大学材料科学与工程学院,内蒙古呼和浩特010051 [2]钢铁研究总院,北京100081

出　　处：《热加工工艺》2009年第15期8-10,共3页Hot Working Technology

基　　金：国家"863"高科技资助项目(2007AA03Z506)

摘　　要：通过低温冲击试验、断口扫描和金相组织观察,研究了钨极氩弧焊和手工电弧焊两种焊接方法对9Ni钢焊接接头低温韧性的影响。结果表明,钨极氩弧焊焊缝和热影响区组织细小,断口韧窝尺寸大而深,使接头低温韧性高于手工焊接头。实验结果对9Ni钢的实际焊接提供了理论依据,对正确制定焊接工艺具有一定的指导意义。By impact testing, SEM of fracture surface and optical microscopy of microstructure, the effect of tungsten-inert-gas arc welding （TIG） and shielded metal arc welding （SMAW） on toughness of welding joint of 9Ni steel was studied.The result shows that weld metal and HAZ microstructure is finer in the TIG, fracture dimple becomes larger and deeper, inducing the higher low-temperature impact toughness of the welded joints. The results can be used as theoretic basis for making welding procedure of 9Ni steel.

关 键 词：9NI钢 焊接接头 显微组织 低温韧性 

分 类 号：TG142.79[一般工业技术—材料科学与工程]