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通过脉冲激光填丝焊接方法,采用准0.5 mm的8407激光焊丝对5 mm厚Cr13Mo1Si1V1钢试板进行堆焊,模拟了失效模具表面磨损激光焊接修复,研究了激光功率密度对修复接头形貌、组织和硬度的影响。结果表明,随着功率密度的增加,母材的熔化深度、宽度逐渐增加,而熔堆高度降低,熔堆焊缝宽度先减少后增加;焊缝金属中细小的片状马氏体逐渐粗化,最后转变为板条马氏体,同时还出现了隐晶马氏体,残余奥氏体量增多,碳化物逐渐细化,热影响侧熔合区中碳化物增多,呈细小弥散分布;焊缝区的硬度逐渐降低,HAZ及熔合区的宽度几乎呈线性增大的趋势,最高硬度则略有下降。
The welding of 5 mm thick Cr13Mo1Si1V1 steel was simulated by using the pulsed laser wire-bonding welding method with the 840 mm laser wire of 0.5 mm, and the laser welding repair of the worn surface of the failure die was simulated. The effects of laser power density on the repair of the joint morphology, And hardness effects. The results show that with the increase of the power density, the depth and width of the base metal melting gradually increase while the height of the molten pool decreases, and the width of the weld bead first decreases and then increases. The fine lamellar martensite in the weld metal gradually coarsens , And finally transformed into lath martensite. At the same time, there also appeared cryptocrystalline martensite, the amount of retained austenite increased, the carbides gradually refined, the carbides in the heat affected zone increased, showing small and diffuse distribution. The hardness of the zone gradually decreases, the width of the HAZ and the fusion zone almost linearly increases, and the maximum hardness decreases slightly.