X80管线钢GMAW的数值模拟及组织研究  

Numerical Simulation and Microstructure of GMAW of X80 Pipeline Steel

作　　者：周祯童 周建平[1] 许燕[1] 刘宏胜[1] ZHOU Zhentong;ZHOU Jianping;XU Yan;LIU Hongsheng(School of Mechanical Engineering,Xinjiang University,Urumqi 830047,China)

机构地区：[1]新疆大学机械工程学院,新疆乌鲁木齐830047

出　　处：《热加工工艺》2022年第21期134-139,143,共7页Hot Working Technology

基　　金：自治区高校科研计划自然科学重点项目(XJEDU2018I006)。

摘　　要：为了改善X80管线钢焊缝接头性能,通过试验和数值模拟的方法对熔化极气体保护焊(GMAW)接头热影响区进行了研究。进行了一次回归正交试验,获得了焊缝尺寸与工艺参数的关系。在此基础上,以获得的焊缝形状尺寸对双椭球热源模型参数进行标定并进行温度场计算,对不同热输入下热影响区的热循环参数进行了探讨,最后观察了热影响区组织。结果表明,以焊缝实际尺寸作为热源参数模拟得到的熔池尺寸与实际更接近,同时证明了有限元模型的准确性;随热输入增大,热影响区的峰值温度增大,冷却时间和高温停留时间也增大,但增大不明显,同时热影响区内晶粒尺寸增大。In order to improve the performance of X80 pipeline steel welded joints, the heat affected zone of the GMAW joints was studied by experiment and numerical simulation. A regression orthogonal experiment was carried out and the relationship between the weld size and process parameters was obtained. On this basis, the double ellipsoid heat source parameters were calibrated with the obtained weld dimension, and the temperature field was calculated. The thermal cycle parameters in heat affected zone under different heat input were discussed and finally the microstructure was observed. The results show that the size of the weld pool simulated by using the actual size of the weld as the heat source parameter is closer to the actual size, and the accuracy of the finite element model is also proved. With the increase of heat input, the peak temperature of the heat affected zone increases, the cooling time and residence time at high temperature also increase, but the increase is not obvious, and the grain size of the heat affected zone increases.

关 键 词：X80管线钢 一次回归正交试验 双椭球热源 热循环 

分 类 号：TG444.72[金属学及工艺—焊接]