不同热煨工艺对X80级弯管焊接粗晶区组织和性能的影响  

Effects of Different Simmering Processes on Microstructure and Properties of X80 Grade Bend Pipe Welding Coarse Crystal Area

作　　者：牛辉[1,2] 杜江 李兰云[1] 张万鹏[2] 杨耀彬[2] NIU Hui;DU Jiang;LI Lanyun;ZHANG Wanpeng;YANG Yaobin(School of Materials Science and Engineering,Xi’an Shiyou University,Xi'an 710065,China;Research Institute of Steel,Pipe Baoji Petroleum Pipe Co.,Ltd.,Baoji 721008,China)

机构地区：[1]西安石油大学材料科学与工程学院,陕西西安710065 [2]宝鸡石油钢管有限责任公司钢管研究院,陕西宝鸡721008

出　　处：《热加工工艺》2021年第13期124-127,132,共5页Hot Working Technology

基　　金：国家重点研发计划项目(2017YFB0304904);陕西省重点研发计划项目(2018ZDXM-GY-122)。

摘　　要：采用Gleeble-3500热模拟机模拟X80级弯管焊接粗晶区实际焊接热过程,并通过硬度测试、夏比冲击试验、扫描电镜观察等分析方法对不同热煨工艺处理前后的X80级弯管焊接粗晶区力学性能和显微组织进行了研究。结果表明,X80级弯管焊接粗晶区组织主要以粗大的GB+BF为主,冲击功仅为67 J,焊接热循环高温热过程产生的粗大组织是导致焊接粗晶区低温韧性较差的主要原因。而在经过860℃淬火+550℃回火热煨处理后X80级弯管焊接粗晶区低温韧性得到显著改善,此时组织主要以细小的AF和BF板条为主,冲击功为201 J。弯管焊接粗晶区韧性改善主要得益于热煨过程中所产生的晶粒细化效应。因此,建议实际生产中选用860℃×10 min淬火+550℃×90 min回火作为X80级弯管热煨弯制的最佳工艺匹配。Gleeble-3500 thermal simulator was used to simulate the actual welding thermal process of X80 grade elbow welding coarse grain heat affected zone(CGHAZ). The microstructure and mechanical properties of(CGHAZ) of X80 grade elbow were studied by hardness test, sharp impact test and scanning electron microscope observation. The results show that the microstructure of X80 grade elbow welding coarse grain area is mainly coarse GB+BF, and the impact energy is only 67 J.The coarse grain structure generated during high temperature welding thermal cycle is the main reason for the low temperature toughness of welding coarse grain area. After quenching at 860℃+ tempering at 550℃, the low-temperature toughness of X80 grade elbow welding coarse grain area is significantly improved. At this time, the microstructure is mainly composed of fine AF and BF strips, and the impact energy is 201 J. The improvement of toughness of elbow welding coarse grain area is mainly due to the grain refining effect during the process of hot simmering. Therefore, it is suggested that 860℃×10 min quenching+550℃×90 min tempering should be selected as the best process for X80 grade bend pipe.

关 键 词：热煨工艺 X80级弯管 焊接粗晶区 低温韧性 

分 类 号：TG457.11[金属学及工艺—焊接]