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采用光纤激光焊接高强钢DP980,并对温度场分布进行有限元计算。结果表明,焊缝中心热循环温度高达3204℃,迅速冷却后形成马氏体组织,硬度较母材提高30%,抗拉强度达到了1115.7 MPa,延伸率相对母材下降49.1%。回火区应力应变曲线存在明显的屈服平台,抗拉强度(850.7 MPa)明显低于母材(986.9 MPa)。焊接接头抗拉强度为母材的87.1%,延伸率为母材的32.7%。焊接接头拉伸试样和杯突试样均断于回火区。焊接接头的杯突值较母材下降32.58%,母材主应变值高于焊接接头。
Fiber laser welding of high strength steel DP980, and the temperature field distribution of finite element calculations. The results show that the thermal cycling temperature of the weld center reaches as high as 3204 ℃ and the martensite structure is formed by rapid cooling. The hardness increases 30% compared with the base metal, the tensile strength reaches 1115.7 MPa and the elongation decreases by 49.1% compared with the base metal. The stress-strain curve of the tempering zone has obvious yield platform, and the tensile strength (850.7 MPa) is obviously lower than that of the base metal (986.9 MPa). The tensile strength of the welded joints was 87.1% of the base metal and the elongation was 32.7% of the base metal. Tensile specimens welded joints and cupping samples were broken in the tempering zone. Outburst value of the welded joint is 32.58% lower than that of the base metal, and the main strain of the base material is higher than that of the welded joint.