【摘要】 H13模具钢在制造业有广泛的应用,大多数的工作环境比较恶劣,表面经常会出现各种失效问题,因此需要对其表面进行强化处理.单一进行激光表面强化处理时,强化层的性能往往达不到预期需求,进而采用超声辅助的方法进行强化涂层的制备.基于超声辅助激光熔覆的过程中,通过对H13模具钢进行熔覆强化层的制备,探究超声功率对熔覆层尺寸及微观组织的影响.结果表明,施加超声振动后增大了熔池表面的润湿性,焊缝表面变得相对平坦,超声振动使熔覆层内的元素分布更加均匀,晶粒更加细化,施加超声振动后的熔覆强化层显微硬度比未施加超声振动提高了21%.用激光熔覆修复模具的同时施加超声振动,可以大幅度的提高模具表面的各种力学性能,延长模具的服役时间.更多还原

【Abstract】 H13 die steel is widely used in the manufacturing industry. Most of the working environment is harsh, and various failure problems often occur on the surface. Therefore,the surface of H13 die steel needs to be strengthened. Based on the preparation of cladding strengthening layer for H13 die steel in the process of ultrasonic-assisted laser cladding, the effect of ultrasonic power on the size and microstructure of cladding layer is investigated. The results show that the wettability of molten pool surface is increased after ultrasonic vibration is applied. The weld surface becomes relatively flat.Ultrasonic vibration makes the distribution of elements in the cladding layer more uniform and the grains finer. The microhardness of the cladding strengthened layer after applying ultrasonic vibration is 21% higher than that without applying ultrasonic vibration. Therefore, applying ultrasonic vibration while repairing the mold with laser cladding can greatly improve various mechanical properties of the mold surface and prolong the service time of the mold.更多还原