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X80钢高温蠕变特性及焊后热处理残余应力分析
High-temperature creep property and residual stress analysis after post-weld heat treatment of X80 steel
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- DOI:
- 10.3969/j.issn.1001-2206.2026.01.006
- 作者:
- 代项杰, 裴召华, 黄小光
DAI Xiangjie, PEI Zhaohua, HUANG Xiaoguang
- 作者单位:
- 1. 山东泰宇消防科技集团有限公司, 山东安丘 370303;2. 中国石油辽河工程有限公司, 辽宁盘锦 124010;3. 中国石油大学(华东)储运与建筑工程学院, 山东青岛 266580
1. Shandong Taiyu Fire Technology Group Co., Ltd., Anqiu 370303, China;2. CNPC Liaohe Petroleum Engineering Co., Ltd., Panjin 124010, China;3. College of Pipeline and Civil Engineering, China University of Petroleum (East China), Qingdao 266580 China
- 关键词:
- 焊接; Norton蠕变; 焊后热处理; 残余应力释放
welding;Norton creep;post‐weld heat treatment;residual stress relief
- 摘要:
管道焊接过程中局部高温会造成焊接接头非均匀变形，从而产生焊接残余应力，给油气管道运行带来安全隐患，金属高温蠕变过程能释放焊接残余应力，降低管道安全风险。为提高油气管道系统的完整性，有效降低焊接残余应力，通过高温蠕变试验来研究X80管材高温蠕变特性，测定其高温蠕变参数，构建Norton蠕变本构模型；利用有限元（Advanced Simulation for Engineering and Sciences，ABAQUS）软件建立X80管道环焊缝三维仿真焊接模型，并借助Norton蠕变用户子程序编制该环焊缝的焊后热处理过程数值模拟。在模型验证测试过程中，通过对管道实施环焊及焊缝处局部热处理，应用超声临界折射纵波方法测试了热处理前后焊缝区域的残余应力，结合数值仿真结果对比焊接热处理前后焊缝的应力水平，分析热处理蠕变行为在残余应力释放过程中的机理和作用。结果表明，焊接热处理后管道环焊缝各方向的残余应力均显著降低，最大应力水平下降约360 MPa，热处理蠕变过程对释放焊接残余应力的作用十分重要。研究成果可为X80油气管道焊后热处理工艺的优化提供理论依据和技术参考。
Local high temperature during the welding process causes non-uniform deformation and residual stress, posing a potential safety hazard for oil and gas pipeline operation. The high-temperature creep process of metals can release the welding residual stress to minimize the safety risks of the pipelines. To improve the integrity of the pipeline systems and effectively reduce welding residual stress, the high-temperature creep tests were carried out to study the creep property of X80 pipelines. The high-temperature creep parameters of the X80 pipelines were determined to establish the Norton creep constitutive model. The Advanced Simulation for Engineering and Sciences (ABAQUS) software was used to establish the three-dimensional welding simulation model of the X80 pipeline girth welding. The numerical simulation of the post-weld heat treatment process of the girth weld was compiled with the help of the Norton creep user subprogram. For the model verification test, the circumferential welding of the pipeline and local heat treatment near the welding seam were conducted. The residual stress before and after heat treatment was measured by the ultrasonic critical refraction longitudinal wave method. The stress level in the welding seam before and after heat treatment was compared with the numerical simulation results. The mechanism and role of the creep process of heat treatment in the residual stress relief process were analyzed. The results show that the residual stresses in all directions of the pipeline girth weld after welding and heat treatment are significantly reduced, with the maximum stress level decreased by about 360 MPa. The creep process of heat treatment has a significant effect on the relief of welding residual stresses. The research results can provide theoretical basis and technical reference for post-weld heat treatment process optimization of the X80 oil and gas pipelines.