铁路钢桥用高强度不锈钢复合钢板力学性能及焊接工艺研究
Research on Mechanical Properties and Welding Procedures of High-Strength Stainless-Clad Bimetallic Steel Plates for Railway Steel Bridges
为研究铁路钢桥用高强度不锈钢复合钢板的基本力学性能和焊接工艺,对S31603+Q500qE复合钢板及其两类焊接接头开展了拉伸、冲击、冷弯及维氏硬度试验研究,并对复合界面进行了剪切与粘结性能试验。基于试验结果,得到了高强度不锈钢复合钢材的拉伸力学指标、复合界面强度及冲击韧性指标,并对其冷弯成型性能进行了试验验证;同时获得了两类焊接接头的拉伸力学指标、冲击韧性指标及硬度分布规律。结果表明:高强度不锈钢复合钢材的基本力学性能均满足规范要求,复合界面强度远超规范限值,并随基层强度提高而增大;两类焊接接头的力学性能差异较小,接头WI低温冲击韧性表现更优,接头WII在低温下的冲击韧性及硬度分布略有降低,但两类焊接接头的冲击韧性均满足规范要求,可为不锈钢复合钢材简化焊接工艺的应用提供参考。
To study the basic mechanical properties and welding procedures of high-strength stainless-clad bimetallic steel for railway steel bridges, a series of tests were conducted on the S31603+Q500qE stainless-clad bimetallic steel plates and two types of butt joints. These tests included tensile, Charpy impact, cold bending and Vickers hardness tests. Additionally, shear and combine tests were performed on the bonding interface. Based on the test results, the tensile properties, interface bonding strength, and impact toughness for the high-strength stainless-clad bimetallic steel plate were determined, and their cold bending performance was verified. Furthermore, the tensile properties, impact toughness and Vickers hardness distribution patterns of the butt joints were obtained. The results demonstrate that the basic mechanical properties of the high-strength stainless-clad bimetallic steel meet the specification requirements. Meanwhile, the interfacial bonding strength significantly exceeds these requirements and increases with the strength of base material. The mechanical properties of the two butt joints show minimal differences, with both meeting the impact toughness specifications. However, the impact toughness and hardness distribution of joint WII are slightly lower at low temperatures, while joint WI shows relatively better impact toughness at low temperatures. These findings provide a reliable reference for simplifying the welding procedures for high-strength stainless-clad bimetallic steel.
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国家重点研发计划项目(2022YFB3706403)
国家自然科学基金(52061160485)
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