Microstructure and Properties of Laser Alloying on the Surface of P20 Die Steel

The experiments of laser alloying on the surface of P20 mold steel were conducted.The microstructure and properties of laser alloying specimens were studied.The research shows that laser alloying layer has better properties such as superfine crystals,deeper layer,and good metallurgical bonding with matrix.The hardness of the alloying zone was between 635 HV0.2 and 699 HV0.2,and hardness of the heat affected zone was between 441 HV0.2 and 474 HV0.2.The anti-abrasive performance of alloying specimen increased by 35% more than that of P20 steel.The mold useful life may significantly increase by using laser alloying on the surface of mold.