X65管线钢二次焊接热循环的局部脆化  

Local Frangibility of the X65 Pipeline Steel Second Welding Heat circulation

作　　者：余大涛[1] 李岩[2] 高惠临[1] 

机构地区：[1]西安石油学院,710065 [2]石油天然气管道局生产技术处

出　　处：《焊管》2001年第5期11-16,共6页Welded Pipe and Tube

摘　　要：采用焊接热模拟方法和现代物理测试技术研究了 X65管线钢焊接热影响区的韧性变化规律。研究结果表明 :管线钢在多道焊接过程中 ,当二次热循环的峰值温度处于 (α+γ)临界区时 ,HAZ有最低的韧性 ,表现为临界粗晶区 (IRCG HAZ)局部脆化现象。引起 IRCG HAZ局部脆化的主要原因 ,是在多道焊二次热循环的特定热过程中所形成的粗大、富碳的 M- A组元和表现出来的组织遗传现象。采用预备回火焊道处理可消除组织遗传现象 ;采用补充回火焊道处理可细化M- A组元 。The article researches on the heat affected zone toughness variable rule of X65 pipeline steel welding through adopting the welding heat simulation method and physical test technology. The research result states that during the pipeline steel multi-pass welding, when the peaking value of the second heat circulation locate at the critical area (a+r), the HAZ has the lowest toughness, and the IRCG HAZ occurs local frangibility. The main reason is during the specified heat process of multi-pass second heat circulation, the bulky and rich carbon M-A element and the structure inheritance occurs. Adopting the weld pass pre-temper disposal can eliminate the structure inheritance phenomenon and adopting the supplemental temper disposal can eliminate the local frangibility of the IRCG HAZ.

关 键 词：管线钢 局部脆化 M-A组元 组织遗传 油气管 焊接 热模拟 

分 类 号：TE973.3[石油与天然气工程—石油机械设备] TG457.6[金属学及工艺—焊接]