壁厚对X80管线钢焊接热循环参数的影响  

Effect of Wall Thickness on Welding Thermal Cycle Parameters of X80 Pipeline Steel

作　　者：许波 周建平[1] 许燕[1] 李建军[1] 王恪典 XU Bo;ZHOU Jianping;XU Yan;LI Jianjun;WANG Kedian(School of Mechanical Engineering,Xinjiang University,Urumqi Xinjiang 830047,China;School of Mechanical Engineering,Xi’an Jiaotong University,Xi’an Shanxi 710049,China)

机构地区：[1]新疆大学机械工程学院,新疆乌鲁木齐830047 [2]西安交通大学机械工程学院,陕西西安710049

出　　处：《新疆大学学报（自然科学版）》2020年第2期248-254,共7页Journal of Xinjiang University(Natural Science Edition)

基　　金：新疆维吾尔自治区高校科研项目(XJEDU2018I006).

摘　　要：焊接热循环参数对热影响区组织影响显著,决定焊缝性能.本文采用数值模拟的方法研究了壁厚对X80管线钢焊接热循环参数的影响,结果表明,壁厚的增加对冷却时间t8/5、高温停留时间t_H和峰值温度影响显著,当壁厚由8mm增加到16 mm时,粗晶区冷却速度增加到4.4倍,高温停留时间减少9.1 s,峰值温度下降182℃.增大热输入会延长粗晶区高温停留时间t_H,增大峰值温度,但对冷却时间t8/5改善不明显;焊前预热能够增加高温停留时间和峰值温度,并大幅降低粗晶区冷却速度,当预热温度达到200℃,粗晶区冷却时间t8/5增大到原来的的2.9倍.所得结论对管线钢焊接热影响区组织成分、焊缝性能的预测具有指导意义.Welding thermal cycle parameters have a significant effect on the structure of HAZ,and then determine the mechanical properties of welds.The effect of wall thickness on the welding thermal cycle parameters of X80 pipeline steel was studied by numerical simulation.The results show that the increase of wall thickness has a significant effect on cooling time t8/5,high temperature residence time t_H and peak temperature.When wall thickness increases from 8 mm to 16 mm,the cooling rate in coarse grain zone increases to 4.4 times and high temperature residence time decreases by 9.1 s.The peak temperature decreases by 182℃.Increasing the heat input will prolong the high temperature residence time t_H and increase the peak temperature,but the improvement of cooling time t8/5 is not obvious.Preheating before welding can increase the high temperature residence time and peak temperature,and greatly reduce the cooling speed of coarse grain zone.When the preheating temperature reaches 200℃,the cooling time t8/5 of coarse grain zone increases to 2.9 times of the original.The results obtained have guiding significance for predicting the structure composition and weld properties of heat affected zone of pipeline steel.

关 键 词：壁厚 数值模拟 冷却时间 高温停留时间 峰值温度 

分 类 号：TG402[金属学及工艺—焊接]