06Ni9钢焊接接头热模拟热影响区的组织与性能分析  

Microstructure and Performance Analysis of Thermal Simulation Heat Affected Zone of 06Ni9 Steel Welded Joint

作　　者：曾君 宋付旺 韩彬 ZENG Jun;SONG Fuwang;HAN Bin(Xinjiang Oil Construction Branch,China Petroleum(Xinjiang)Petroleum Engineering Co.,Ltd.,Karamay 834000,China;School of Materials Science and Engineering,China University of Petroleum(East China),Qingdao 266580,China)

机构地区：[1]中油(新疆)石油工程有限公司新疆油建分公司,新疆克拉玛依834000 [2]中国石油大学(华东)材料科学与工程学院,山东青岛266580

出　　处：《热加工工艺》2020年第21期126-129,共4页Hot Working Technology

摘　　要：采用金相显微镜、扫描电镜和焊接热模拟方法,研究了06Ni9钢单道焊接热影响区的显微组织和低温冲击性能。结果表明,06Ni9钢焊接热影响区的低温冲击韧性均低于母材的。峰值温度为1350℃的粗晶区组织为粗大的马氏体组织和极少量的残余奥氏体,低温冲击韧性最低,断口为解理断裂。峰值温度为760℃的细晶区,由于细小马氏体组织和铁素体的形成,低温韧性最高,断口为微孔聚集性断裂。峰值温度为680℃的不完全淬火区和峰值温度为630℃的回火区低温韧性相差不大,均稍低于细晶区的,而远远高于粗晶区的。The microstructure and low temperature impact properties of the single-pass welding heat affected zone of 06Ni9 steel were studied by metallography microscopy, scanning electron microscopy and welding thermal simulation methods. The results show that the low temperature impact toughness of the 06Ni9 steel welding heat affected zone is lower than that of the parent metal. The coarse-grain region with peak temperature of 1350 ℃ has the lowest low-temperature impact toughness due to coarse martensite and a little of retained austenite, and the fracture is cleavage fracture. In the fine-grain region with peak temperature of 760℃, the low-temperature toughness is the hithest due to the presence of fine martensite and ferrite structure, and the fracture is a microporous aggregate fracture. The low temperature impact toughness of incomplete quenching zone with peak temperature of 680℃ and the low temperature toughness of the tempering zone with a peak temperature of 630℃ have little difference, which is slightly lower than that of the fine grain zone, and much higher than that of the coarse grain zone.

关 键 词：06NI9钢 焊接热模拟 热影响区 低温冲击韧性 

分 类 号：TG457.11[金属学及工艺—焊接]