深海X70管线钢热影响区组织及性能变化  

CHANGES IN THE STRUCTURE AND PROPERTIES OF DEEP-SEA X70 PIPELINE STEEL IN THE HEAT AFFECTED ZONE

作　　者：刘治文 杨浩 贾书君[3] 樊依宁 李子健 王蕾 韩鹏彪[1,4] Liu Zhiwen;Yang Hao;Jia Shujun;Fan Yining;Li Zijian;Wang Lei;Han Pengbiao(School of Materials Science and Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,Hebei;HBIS Group Material Technology Research Institute,Shijiazhuang 050018,Hebei;Engineering Steel Research Institute,General Institute of Iron and Steel Research,Beijing 100081;Key Laboratory of Near-Net Forming Technology of Materials of Hebei Province,Shijiazhuang 050018,Hebei)

机构地区：[1]河北科技大学材料科学与工程学院,河北石家庄050018 [2]河钢材料技术研究院,河北石家庄050018 [3]钢铁研究总院工程用钢研究所,北京100081 [4]河北省材料近净成形技术重点实验室,河北石家庄050018

出　　处：《河北冶金》2023年第6期37-40,共4页Hebei Metallurgy

基　　金：河北省省级科技计划资助项目(19211007D)。

摘　　要：为解决深海X70管线钢实际焊接中热影响区(HAZ)的软化问题,采用Gleeble-3800热模拟试验机对X70管线钢进行了不同热循环工艺下的热模拟研究,并利用光学显微镜、扫描电镜和硬度计等手段分析了不同峰值温度下热影响区的组织变化规律。结果表明,不同峰值温度下X70管线钢的组织主要由多边形铁素体、准多边形铁素体、粒状贝氏体、贝氏体铁素体和M-A组元组成;随峰值温度升高,硬度值呈先升高后降低再升高的趋势,在峰值温度1050℃时组织完全奥氏体化,组织主要由多边形铁素体和准多边形铁素体组成,硬度值为210 HV,低于母材硬度,同时细晶区出现了软化。To solve the softening problem of heat-affected zone(HAZ)in the actual welding of deep-sea X70 pipeline steel,Gleeble-3800 thermal simulation testing machine was used to study the thermal simulation of X70 pipeline steel under different thermal cycle processes,and the microstructure changes of heat-affected zone at different peak temperatures were analyzed by optical microscope,scanning electron microscopy and hardness test.The results show that the microstructure of X70 pipeline steel at different peak temperatures is mainly composed of polygonal ferrite,quasi-polygon ferrite,granular bainite,bainite ferrite and M-A component.With the increase of peak temperature,the hardness value showed a trend of first increasing and then decreasing and then increasing,and the tissue was completely austenitized at the peak temperature of 1050℃,and the tissue was mainly composed of polygonal ferrite and quasi-polygon ferrite,and the hardness value was 210 HV,which was lower than the hardness of the base metal,and the fine grain area softened.

关 键 词：管线钢 X70 热影响区 软化 硬度 

分 类 号：TE973.3[石油与天然气工程—石油机械设备]