利用热模拟技术对X100管线钢热影响区粗晶区的组织和冲击韧性的研究  

Study on Microstructure and Properties of CGHAZ of X100 Pipeline Steel Using Thermal Simulation Technique

作　　者：李光[1] 史容睿 董会[1] 徐学利[1] 张骁勇[1] LI Guang;SHI Rongrui;DONG Hui;XU Xueli;ZHANG Xiaoyong(School of Materials Science and Engineering,Xi'an Shiyou University,Xi'an 710065,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

出　　处：《热加工工艺》2022年第19期114-117,共4页Hot Working Technology

摘　　要：采用热模拟技术研究了X100管线钢粗晶热影响区(CGHAZ)在不同冷却时间下的组织和冲击韧性。结果表明:当t8/5冷却时间在5~21 s范围内,粗晶区晶粒尺寸较小,晶粒内部的贝氏体铁素体板条使粗晶区具有较高的冲击韧性。当t8/5冷却时间在32~130 s范围内,晶粒尺寸显著增大,晶粒内部出现了准多边形铁素体和大尺寸的M-A岛等非典型组织,使粗晶区的冲击韧性明显下降。The microstructure and impact toughness of coarse-grained heat affected zone(CGHAZ) in X100 pipeline steel were studied by thermal simulation technique.The results indicate that when the cooling time t8/5is 5-21 s, the CGHAZ has small grain size, and bainitic ferrite lathes in the grains ensure that the CGHAZ has good impact toughness. When the cooling time t8/5is 32-130 s, the grain size increases and quasi-polygonal ferrite and large size M-A islands appear in the grains, therefore the impact toughness of CGHAZ decreases sharply.

关 键 词：X100管线钢 热模拟 粗晶热影响区 冷却时间 冲击韧性 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TG407[金属学及工艺—金属材料]