铸造技术2026，Vol.47Issue(2)：189-194,6.DOI:10.16410/j.issn1000-8365.2026.5191
500 MPa级高性能桥梁钢焊缝的微观组织
Microstructure of 500 MPa High Performance Bridge Steel Welds
摘要
Abstract
Strengthening and toughening welds are the keys to improving the mechanical properties of high-performance bridge steel welds.Optimizing weld performance through microstructure control is an effective way to achieve this goal.Taking 500 MPa high-performance bridge steel as the research object,the typical characteristics of its weld microstructure were systematically analysed,and a mapping relationship between microstructure and impact toughness was established,providing a theoretical basis for the strengthening and toughening design of high-performance bridge steel welds.Research has shown that the small and staggered distribution of needle-like ferrite forms a"basketweave",which increases the energy required for crack initiation and propagation and improves the impact toughness of welded joints.The polygonal ferrite structure is prone to intergranular cracks due to the large difference in grain boundary orientation,which reduces the crack initiation energy of welded joints.The hindering effect of the coarse needle-like ferrite structure on crack propagation is significantly reduced,resulting in a decrease in the impact toughness of the welded joints.关键词
高性能桥梁钢/埋弧焊/焊接电流/微观组织/冲击韧性Key words
high performance bridge steel/submerged arc welding/welding current/microstructure/impact toughness分类
矿业与冶金引用本文复制引用
郝玉朋,高振坤,李力,胡玉堂,孙东宁..500 MPa级高性能桥梁钢焊缝的微观组织[J].铸造技术,2026,47(2):189-194,6.基金项目
中国铁道科学研究院集团有限公司科研基金(2022YJ212) （2022YJ212）
