Simulation study on heat-affected zone of high-strain X80 pipeline steel

查看全文 作　　者：Ying [1]Ci;Zhan-zhan [2]Zhang

机构地区：[1]College of Information Science and Engineering,Northeastern University;[2]School of Physical Science and Engineering,Zhengzhou University

出　　处：《Journal of Iron and Steel Research(International)》索引2017年第24卷第9期,共7页

摘　　要：The microstructure evolution and impact-toughness variation of heat-affected zone(HAZ)in X80 highstrain pipeline steel were investigated via a welding thermal-simulation technique,Charpy impact tests,and scanning electron microscopy observations under different welding heat inputs and peak temperatures.The results indicate that when heat input was between 17 and 25kJ·cm^(-1),the coarse-grained heat-affected zone showed improved impact toughness.When the heat input was increased further,the martensite-austenite(M-A)islands transformed from fine lath into a massive block.Therefore,impact toughness was substantially reduced.When the heat input was 20kJ·cm^(-1) and the peak temperature of the first thermal cycle was between 900 and 1300°C,a higher impact toughness was obtained.When heat input was 20kJ·cm^(-1) and the peak temperature of the first thermal cycle was 1300°C,the impact toughness value at the second peak temperature of 900°C was higher than that at the second peak temperature of 800°C because of grain refining and uniformly dispersed M-A constituents in the matrix of bainite. 关键词：粗晶热影响区 X80管线钢热模拟技术高应变焊接热输入冲击韧性值电子显微镜观察峰值温度

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Simulation study on heat-affected zone of high-strain X80 pipeline steel

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