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激光表面改性技术是以激光为热源用于表面热处理的新方法,它包括激光相变硬化、合金化和激光熔覆等。国外利用15 kWCO_2激光对热轧工具进行激光合金化,使表面层合金元素含量达20％,与现有最好的未经激光合金化处理的热轧工具钢相比寿命提高2～3倍。激光熔覆的优点是可根据表面性能需要调整表面层的成分。本文目的是利用2 kWCO_2激光。用送粉激光熔覆工艺实现一种高温合金的激光熔覆。该合金含有一定数量的WC-W_2C粒子,通过合金元素对母体相的固溶强化和碳化物的弥散强化来提高熔覆合金在高温下的强度和硬度。
Laser surface modification technology is a new method of laser heat treatment for surface heat treatment, which includes laser phase transformation hardening, alloying and laser cladding. Overseas 15 kWCO_2 laser hot rolling tool for laser alloying, the surface layer of alloying elements content of 20%, and the best without laser hot-rolled alloy tooling life of 2 to 3 times. The advantage of laser cladding is that the composition of the surface layer can be tailored to the surface properties required. The purpose of this paper is to use a 2 kW CO2 laser. Laser cladding of a superalloy by powder delivery laser cladding. The alloy contains a certain amount of WC-W 2 C particles, which can improve the strength and hardness of the cladding alloy under high temperature by solid solution strengthening of the matrix phase and dispersion strengthening of the carbide.