高温停留时间对X80管线钢焊缝粗晶区组织与性能的影响  

Effect of high temperature holding time on microstructure and properties of coarse-grained zone of welded joint of X80 pipeline steel

作　　者：葛加林 张骁勇[1] 吉玲康 李为卫 何小东 陈庆龙 于晨阳 Ge Jialin;Zhang Xiaoyong;Ji Lingkang;Li Weiwei;He Xiaodong;Chen Qinglong;Yu Chenyang(School of Materials Science and Engineering,Xi'an Shiyou University,Xi'an Shaanxi 710065,China;Tubular Goods Research Center of CNPC,Xi'an Shaanxi 710077,China;State Key Laboratory for Performance and Structural Safety of Oil Industry Equipment Materials,Xi'an Shaanxi 710077,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]中国石油集团石油管工程技术研究院,陕西西安710077 [3]石油管材及装备材料服役行为与结构安全国家重点实验室,陕西西安710077

出　　处：《金属热处理》2020年第7期119-123,共5页Heat Treatment of Metals

基　　金：国家自然科学基金(51174165);国家重点研发计划(2018YFC0310305);西安石油大学研究生创新与实践能力培养计划(YCS17211035);陕西省自然科学基金(2018JM5076)。

摘　　要：利用Gleeble-3500热模拟机、组织分析、力学测试、扫描电镜等方法研究了高温停留时间对X80管线钢焊缝热影响粗晶区(Coarse-grained heat-affected zone,CGHAZ)组织性能的影响。研究结果表明,X80管线钢热影响区粗晶区的组织主要由粒状贝氏体、贝氏体铁素体以及M/A组元组成。随着高温停留时间的增加,碳氮原子扩散速度增加,成分更加趋于均匀化,粒状贝氏体和贝氏体铁素体交错分布程度增加,M/A岛状组织以及碳氮化合物分布更加弥散,粗晶区韧性值逐渐增加,当高温停留时间为18 s时,粗晶区冲击性能最佳,-10℃的冲击吸收能量为288 J,硬度值适中,为270 HV0.3。当高温停留时间大于18 s时,粗晶区冲击吸收能量有所下降,硬度值增大。高温停留时间为8 s时,粗晶区韧性最低,冲击吸收能量仅为49 J,硬度值最高,为283 HV0.3。Effect of high temperature holding time on microstructure and properties of X80 pipeline steel in the CGHAZ was studied by means of Gleeble-3500 thermal simulator,microstructure analysis,mechanical test and SEM.The results show that the coarse-grained zone of X80 pipeline steel is mainly composed of granular bainite,bainite ferrite and M/A component.With the increase of high temperature holding time,the diffusion rate of carbon and nitrogen atoms increases,the composition is tended to be more uniform,the cross distribution of granular bainite and bainite ferrite increases,the distribution of M/A island structure and carbon nitrogen compounds is more dispersed,and the toughness value of coarse-grained zone is also increased gradually.When the high temperature holding time is 18 s,the impact toughness of the coarse grain zone is the best,the impact absorbed energy of-10℃is 288 J,and the moderate hardness value is 270 HV0.3.When the high temperature holding time is beyond 18 s,the impact absorbed energy of the coarse-grained zone decreases and the hardness value increases.When the high temperature holding time is 8 s,the impact toughness of coarse-grained zone is the lowest,the impact absorbed energy is only 49 J,the hardness value is the highest,is 283 HV0.3.

关 键 词：X80管线钢 粗晶区 高温停留时间 M/A组元 粒状贝氏体 贝氏体铁素体 

分 类 号：TG457.11[金属学及工艺—焊接]