X70钢不同焊接方法下焊接接头低温CTOD试验  

Low Temperature CTOD Experiment of X70 Pipeline Steel Welded Joints Welded by Different Welding Methods

作　　者：王士博 王宇晴 张春瑞 张长军[1] 蔡和平[3] 郭亚杰[1] WANG Shibo;WANG Yuqing;ZHANG Chunrui;ZHANG Changjun;CAI Heping;GUO Yajie(School of Materials Science and Engineering,Chang'an University,Xi'an 710064,China;Technical Center,Jinduicheng Molybdenum Co.,Ltd.,Xi'an 710077,China;State Key Laboratory for Mechanical Behavior of Materials,Xi'an Jiaotong University,Xi'an 710049,China)

机构地区：[1]长安大学材料科学与工程学院,陕西西安710064 [2]金堆城钼业股份有限公司技术中心,陕西西安710077 [3]西安交通大学金属材料强度国家重点实验室,陕西西安710049

出　　处：《热加工工艺》2019年第23期58-61,共4页Hot Working Technology

基　　金：陕西省重点研发计划项目(2017GY-033);陕西省博士后基金特别资助项目(2017BSHTDZZ01)

摘　　要：对采用4种不同焊接方法的X70管线钢焊接接头的热影响区进行了低温CTOD试验,并结合断口形貌和金相组织对断裂韧性进行了分析。结果表明,采用熔化极气体保护焊+双面多丝埋弧焊的焊接接头CTOD值最高,CTOD值的分布符合韦布尔分布规律,断裂韧性较好;其组织以针状铁素体和粒状贝氏体为主。Low-temperature CTOD tests of welded joints of X70 pipeline steel welded by four different welding methods were carried out and the fracture toughness were analyzed by combining the fracture morphology and metallographic structure.The results indicate that the welded joint using gas metal arc welding(GMAW)+submerged arc welding(SAW)method exhibits the highest CTOD value,and the distribution of CTOD values conforms to Weibull distribution law well.The fracture toughness is better.And its microstructure is mainly acicular ferrite and granular bainite.

关 键 词：X70管线钢 焊接接头 CTOD 

分 类 号：TG407[金属学及工艺—焊接]