焊后热处理对X65管线钢焊接接头显微组织及拉伸性能的影响
Influence of Post-welding Heat Treatment on the Microstructure and Tensile Properties of X65 Pipeline Steel Welding Joints
- 2025年55卷第1期 页码:122-127
纸质出版日期: 2025-01-20
DOI: 10.7512/j.issn.1001-2303.2025.01.17
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纸质出版日期: 2025-01-20 ,
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许平非,车洪艳,翟亚中.焊后热处理对X65管线钢焊接接头显微组织及拉伸性能的影响[J].电焊机,2025,55(1):122-127.
XU Pingfei, CHE Hongyan, ZHAI Yazhong.Influence of Post-welding Heat Treatment on the Microstructure and Tensile Properties of X65 Pipeline Steel Welding Joints[J].Electric Welding Machine, 2025, 55(1): 122-127.
为研究焊后热处理对X65管线钢焊接接头显微组织及拉伸性能的影响。采用焊条电弧焊对X65管线钢进行多层多道焊接,并对焊接接头进行550 ℃保温2 h的焊后热处理。结果表明,热处理有效改善了焊缝区的显微组织,将粗大的柱状晶转变为细小的块状组织,并促进了碳化物的析出。力学性能测试显示,热处理后的焊缝抗拉强度提高至590 MPa,断后延伸率达到31.2%,显著优于未处理焊缝。分析认为,晶粒细化、碳化物析出以及晶界钉扎效应共同作用,提升了焊接接头的室温拉伸强度和韧性。研究结果为优化X65管线钢焊接接头性能提供了理论依据,对提高管道系统的安全性和可靠性具有重要意义。
In order to study the effect of post-welding heat treatment on the microstructure and tensile properties of X65 pipeline steel welding joints
multi-layer and multi-pass welding of X65 pipeline steel was carried out using electrode arc welding
and the welding joints were subjected to post-welding heat treatment at 550 ℃ for 2 hours. The results show that the heat treatment effectively improved the microstructure of the weld zone
transforming the coarse columnar crystals into fine blocky structures
and promoting the precipitation of carbides. Mechanical property tests show that the tensile strength of the heat-treated weld increased to 590 MPa
and the elongation after fracture reached 31.2%
significantly better than the untreated weld. The analysis suggests that the combined effects of grain refinement
carbide precipitation
and grain boundary pinning contribute to the improvement of the room temperature tensile strength and toughness of the welding joints.
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