Thermal simulation test and microstructure characterization method of heat affected zone of pipeline steel girth weld
ZHANG Hesong1, CUI Shaohua2, LIU Shilin3, WANG Hao1, LI Yuan1
1. Central Iron and Steel Research Institute Co., Ltd., Beijing 100081,China; 2. China Oil & Gas Piping Network,Beijing 100013,China; 3. Construction Project Management Branch of China Oil & Gas Piping Network,Langfang 065000,China
Abstract：The automatic girth welding process is widely used in high grade oil and gas long distance pipelines with large diameter. The microstructure and property of the heat affected zone of the girth weld are complicated. It is important to establish a systematic analysis method for the microstructure and property of the heat affected zone of the girth weld. In this study, the process route of weld thermal simulation test was optimized according to the phase change characteristics of high-grade pipeline steel. Gleeble 3500 thermal simulation test machine was used to conduct the weld thermal simulation test, and the thermal simulation samples were obtained under different heat input and peak temperature conditions. The microstructure and its substructure were analyzed by scanning electron microscope (SEM) and electron backscattered diffraction (EBSD), and the relationship between microstructure and Charpy impact toughness was established. The results showed that the microstructure characteristics closely related to the low temperature toughness of the heat affected zone of the girth weld included effective grain size, high angle grain boundary ratio, and the morphology and size distribution of martensite/austenite (M/A) components. When the effective grain size was small, the proportion of high angle grain boundary was large, and the small size M/A component was granular, it had high low temperature toughness. When the large size M/A island chain structure appeared, the low temperature toughness was low.
张鹤松, 崔绍华, 刘诗琳, 王浩, 李园. 管线钢环焊接头热影响区热模拟实验及组织性能分析方法[J]. 冶金分析, 2024, 44(8): 59-66.
ZHANG Hesong, CUI Shaohua, LIU Shilin, WANG Hao, LI Yuan. Thermal simulation test and microstructure characterization method of heat affected zone of pipeline steel girth weld. , 2024, 44(8): 59-66.
[1] 刘阳,刘峻峰,张斌,等.我国长输天然气用管线钢的发展现状与趋势[J].材料热处理学报,2024,45(3):98-112. LIU Yang,LIU Junfeng,ZHANG Bin,et al.Development status and trend of pipeline steel for long-distance natural gas transportation in China[J].Transactions of Materials and Heat Treatment,2024,45(3):98-112. [2] 王晓香.管道安全对焊管制造技术的新挑战[J].焊管,2020,43(9):1-5. WANG Xiaoxiang.New challenges of pipeline safety to welded pipe manufacturing technology[J].Welded Pipe and Tube,2020,43(9):1-5. [3] 程玉峰.保障中俄东线天然气管道长期安全运行的若干技术思考[J].油气储运,2020,39(1):1-8. CHENG Frank.Technical insights into the long-term integrity and sustainability of China-Russia Eastern Gas Pipeline[J].Oil & Gas Storage and Transportation,2020,39(1):1-8. [4] 冯耀荣,吉玲康,李为卫,等.中国X80管线钢和钢管研发应用进展及展望[J].油气储运,2020,39(6):612-622. FENG Yaorong,JI Lingkang,LI Weiwei,et al.Progress and prospects of research and application of X80 pipeline steel and steel pipe in China[J].Oil & Gas Storage and Transportation,2020,39(6):612-622. [5] X C,Zhao J X,Jia S J,et al.Ultrafine microstructure design of high strength pipeline steel for low temperature service:The significant impact on toughness[J].Materials Letters,2021,303:130429. [6] Duan H,Shan Y Y,Yang K,et al.Effect of microstructure and crystallographic orientation characteristics on low temperature toughness and fracture behavior of pipeline steels[J].Journal of Materials Research and Technology,2022(17):3172-3185. [7] 张宏,吴锴,冯庆善,等.高钢级管道环焊接头力学性能与适用性评价研究进展[J].油气储运,2022,41(5):481-497. ZHANG Hong,WU Kai,FENG Qingshan,et al.State of the art on mechanical properties and fitness-for-service assessment of high-grade pipeline girth weld[J].Oil & Gas Storage and Transportation,2022,41(5):481-497. [8] 侯宇.合金元素对X80管线钢环焊接头组织和性能的影响[J].冶金分析,2023,43(4):24-33. HOU Yu.Effect of alloying element on microstructure and propertiesof girth welded joints of X80 pipeline steel[J].Metallurgical Analysis,2023,43(4):24-33. [9] 隋永莉,王鹏宇.中俄东线天然气管道黑河—长岭段环焊缝焊接工艺[J].油气储运,2020,39(9):961-970. SUI Yongli,WANG Pengyu.Girth welding technology used in Heihe-Changling Section of China-Russia Eastern Gas Pipeline[J].Oil & Gas Storage and Transportation,2020,39(9):961-970. [10] Xie J,Cai C,Liang Y,et al.Microstructure and mechanical properties of heat affected zone of laser-MAG hybrid welded low carbon bainitic steel joints[J].Optics & Laser Technology,2022,148:107729. [11] Sun M Y,Wang Z Q,Wang X M,et al.The significance of variant pairing in governing toughness of coarse-grained heat affected zone (CGHAZ) in Nb-bearing high strength structural steels[J].Materials Letters,2020,260:126974. [12] Wang B, Chen N, Cai Y,et al.Effect of crystallographic features on low-temperature fatigue ductile-to-brittle transition for simulated coarse-grained heat-affected zone of bainite steel weld[J].International Journal of Fatigue,2023,170:107523. [13] 朱海山,徐连勇,曹健,等.t(8/5)对X100管线钢热影响区粗晶区断裂韧性的影响[J].焊接,2021(3):5-12,61. ZHU Haishan,XU Lianyong,CAO Jian,et al. Effect of t(8/5) on fracture toughness of CGHAZ of X100 pipeline steel[J].Welding & Joining,2021(3):5-12,61. [14] Han Y,Fei J,Xin P,et al.Microstructure and properties of intercritically reheated coarse-grained heat affected zone in pipeline steel after secondary thermal cycle[J].International Journal of Hydrogen Energy,2021,46(52):26445-26456. [15] 熊祥江,李艳梅,陈博轩,等.控轧工艺对厚壁X70管线钢低温止裂性能的影响[J].轧钢,2022,39(2):37-43. XIONG Xiangjiang,LI Yanmei,CHEN Boxuan,et al.Effect of controlled rolling process on low temperature crack arrest performance of thick wall X70 pipeline steel plate[J].Steel Rolling,2022,39(2):37-43. [16] Li X,Lu G,Wang Q,et al.The effects of prior austenite grain refinement on strength and toughness of high-strength low-alloy steel[J].Metals,2022,12(1):28. [17] Changsheng Xie,Zhengdong Liu,Xikou He,et al.Effect of martensite-austenite constituents on impact toughness of pre-tempered MnNiMo bainitic steel-science direct[J].Materials Characterization,2020,161:110139.
