焊接速度对TRIP590高强钢激光焊接接头组织与力学性能的影响

发布时间：2018-06-12 14:38

本文选题：TRIP钢 + 激光焊接　；参考：《机械工程材料》2017年04期

【摘要】：采用光纤激光器对1.5mm厚TRIP590钢板进行对接焊,观察了接头的宏观形貌和显微组织,测试了其硬度和拉伸性能,分析了焊接速度(0.050,0.067,0.083m·s~(-1))对焊缝成形、接头组织与力学性能的影响。结果表明:较低和较高的焊接速度均不利于焊缝成形,焊缝表面均有较大的凹陷,焊接速度对组织与性能影响不大;焊缝区和近焊缝热影响区组织主要为马氏体组织,该区硬度较高,约为母材的2倍;近母材侧热影响区组织主要为铁素体和马氏体组织,且距焊缝越远,马氏体组织越少,硬度也急剧下降;焊接接头的屈服强度和抗拉强度均稍高于母材的,塑性略低于母材的;接头均在母材区发生断裂,且为韧性断裂。
[Abstract]:The butt welding of 1.5mm thick TRIP590 steel plate was carried out by using fiber laser. The macroscopic morphology and microstructure of the joint were observed, its hardness and tensile properties were tested, and the effect of welding speed of 0.050 ~ 0.067 ~ 0.083m sm ~ (-1) on the weld formation, microstructure and mechanical properties was analyzed. The results show that the lower and higher welding speed is not conducive to weld forming, the weld surface has a large depression, the welding speed has little effect on the microstructure and properties, and the microstructure of the weld zone and the heat affected zone near the weld is mainly martensite structure. The hardness of the zone is about 2 times of that of the base metal, the microstructure of the heat affected zone near the base metal is mainly ferrite and martensite, and the farther away from the weld, the less the martensite structure is and the lower the hardness is. The yield strength and tensile strength of the welded joints are slightly higher than those of the base metal and the plasticity is slightly lower than that of the base metal, and the joints are broken in the base metal region and are ductile fracture.
【作者单位】：上海工程技术大学材料工程学院;上海工程技术大学上海市高强激光智能加工装备关键技术产学研开发中心;
【基金】：上海汽车工业科技发展基金资助项目(1404) 上海工程技术大学研究生科研创新项目(15KY0513)
【分类号】：TG407

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