中国激光, 2019, 46 (4): 0402005, 网络出版: 2019-05-09
10Ni5CrMoV钢真空激光焊接焊缝的组织与性能 下载: 1408次
Microstructures and Properties of Weld Bead of 10Ni5CrMoV Steel Obtained with Laser Welding at Vacuum
激光技术 低合金高强钢 真空环境 激光焊接 力学性能 微观组织 laser technique low alloy and high strength steel vacuum environment laser welding mechanical properties microstructure
摘要
采用真空激光焊接方法对10Ni5CrMoV低合金高强钢进行焊接,研究了环境压力对焊缝组织和力学性能的影响。结果表明:真空激光焊接可以明显改善激光焊缝的表面成形质量,增加焊缝熔深;环境压力对焊缝组织的影响不大,对热影响区组织的影响明显;不同环境压力下得到的焊缝均由马氏体组成;在热影响区,随着环境压力的降低,碳化物逐渐析出,显微组织由马氏体向马氏体+碳化物+极少量粒状贝氏体转变,并且出现了少量铁素体;真空环境下得到的焊缝中马氏体含量降低是硬度下降的主要因素;在环境压力为10 Pa时,焊缝硬度较大气环境下的减小6.2%;拉伸试样均断裂于母材处,试样出现明显的颈缩现象,断裂方式为韧性断裂。
Abstract
Laser welding is used to weld 10Ni5CrMoV high strength steel at vacuum. The effects of ambient pressure on the microstructure of weld bead and mechanical properties are studied. The results show that laser welding at vacuum can improve the weld formation quality and increase penetration depth. The ambient pressure has little effect on microstructure of weld bead, while had obvious influence on the microstructure of heat-affected zone. Weld beads obtained at different ambient pressures are all composed of martensite. With the decrease of ambient pressure, carbides precipitate out in heat-affected zone gradually, the microstructure transforms from martensite to martensite with carbide and very few granular bainite, and a small amount of ferrite are obtained. The decrease of martensite content is the main factor of the microhardness decrease in vacuum environment. When the ambient pressure is 10 Pa, the weld hardness decreased by 6.2% compared with the atmosphere. The tensile samples are all broken at the base metal with obvious necking, and the fracture mode is ductile fracture.
王继明, 李俐群, 彭根琛, 邹吉鹏, 黄瑞生. 10Ni5CrMoV钢真空激光焊接焊缝的组织与性能[J]. 中国激光, 2019, 46(4): 0402005. Jiming Wang, Liqun Li, Genchen Peng, Jipeng Zou, Ruisheng Huang. Microstructures and Properties of Weld Bead of 10Ni5CrMoV Steel Obtained with Laser Welding at Vacuum[J]. Chinese Journal of Lasers, 2019, 46(4): 0402005.