X80管线钢焊接接头HAZ断裂韧性研究  

Study on HAZ fracture toughness of X80 pipeline steel welded joints

作　　者：王良[1,2] 周芙蓉[2] 胡议文 周培山 王斌[2] 郑华林[1] WANG Liang;ZHOU Fu-rong;HU Yi-wen;ZHOU Pei-shan;WANG Bin;ZHENG Hua-lin(School of Mechatronic Engineering,Southwest Petroleum University,Chengdu 610500,China;School of New Energy and Materials,Southwest Petroleum University,Chengdu 610500,China;Patent Examination Cooperation Sichuan Center of the Patent Office,CNIPA,Chengdu 610500,China)

机构地区：[1]西南石油大学机电工程学院,四川成都610500 [2]西南石油大学新能源与材料学院,四川成都610500 [3]国家知识产权局专利局专利审查协作四川中心,四川成都610500

出　　处：《塑性工程学报》2023年第10期212-220,共9页Journal of Plasticity Engineering

摘　　要：通过对X80管线钢焊接接头热影响区(HAZ)进行裂纹尖端张开位移(CTOD)试验,研究了X80管线钢在HAZ的断裂韧性。结果表明,X80焊接接头HAZ主要由板条贝氏体(LB)、粒状贝氏体(GB)和马氏体/奥氏体(M/A)等组成,其中LB∶GB为3∶1。试验钢HAZ在-10和-30℃温度下的夏比冲击功分别为210和136 J,表现出优良的冲击韧性。此外,试验钢在HAZ在-10℃下的平均CTOD特征值δ_(m)为0.952 mm,而在-30℃下的平均CTOD特征值δ_(m)为0.437 mm。随着试验温度的降低,HAZ的断裂韧性逐渐降低。断口表面上的韧窝为撕裂伸长型韧窝,呈椭圆或半椭圆状。HAZ中存在微米级的Mo和Ti的球形夹杂物导致断裂韧性降低。The fracture toughness of the X80 pipeline steel in heat affected zone(HAZ)was studied by the crack tip opening displacement(CTOD)test on the X80 pipeline steel welded joints in HAZ.The results show that the HAZ of X80 welded joint is mainly composed of lath bainite(LB),granular bainite(GB)and martensite/austenite(M/A)constituents,the proportion of LB∶GB is 3∶1.The Charpy impact energy of the test steel in HAZ at-10 and-30℃is 210 and 136 J,respectively,which shows excellent impact toughness.In addition,the average CTOD characteristic valueδ_(m) of the test steel in HAZ at-10℃is 0.952 mm,and the average CTOD characteristic valueδ_(m) at-30℃is 0.437 mm.As the test temperature decreases,the fracture toughness of the HAZ gradually decreases.The dimples on the fracture surface are tear elongated dimples,either elliptical or semi-elliptical.The presence of Mo and Ti spherical inclusions in HAZ reduces fracture toughness.

关 键 词：X80管线钢 HAZ CTOD 断裂韧性 

分 类 号：TG407[金属学及工艺—焊接]