在718钢表面进行了超细碳化钨(WC)激光合金化的实验, 利用金相显微镜、维氏硬度计等设备检测了合金化层的组织和性能。通过与氮化试样的比较, 表明激光合金化可以得到晶粒细化, 深度大, 硬度高, 与基体结合牢固的表面强化层。塑料注射成型模具大量使用 718钢作为型芯、型腔等零部件的成型材料。上述成型零部件在磨损、侵蚀和注塑压力的共同作用下, 表面容易发生尺寸、形状的变化而影响成型精度。采用激光合金化强化后, 在 718钢表面形成优良的耐磨层, 大大提高了模具的使用寿命。

The experiment of laser alloying on the surface of 718 steel was made. Tungsten carbide (WC) powder was used asalloying material. The microstructure and property of laser alloying layer and nitriding layer are studied. The comparison betweenthem shows that laser alloying layer has better properties such as minute crystals, deeper layer, higher hardness and goodmetallurgical bonding with base metal. 718 steel is widely used in the field of plastic mold manufacture, especially mold core andcavity. Abrasion, corrosion and pressure result in change of mold size and shape which can greatly affect molding precision. Usinglaser alloying, the good wear layer would be made on the surface of 718 steel and greatly increase the mold useful life.