表面激光强化对汽车模具钢H13组织与性能的影响

Effect of Surface Laser Strengthening on Microstructure and Properties of Automobile Die Steel H13

采用表面激光熔覆和激光冲击强化的方法对汽车模具钢进行表面强化处理,研究了M2高速钢粉末含量(粉末成分:Fe104 75%~100%,M2粉末0~25%,质量分数)对熔覆层显微组织、物相组成和耐磨性能的影响,并探讨了激光冲击强化对熔覆层耐磨性能的影响。结果表明:除未添加M2粉末的M0试样熔覆层中的ɑ-Fe、γ-Fe、M23C6和M7C3相外,添加M2高速钢合金粉末后的熔覆层中还出现了硬度更高的MC、M2C和M6C相;M2高速钢粉末含量的提升有助于细化复合熔覆层的组织,而熔覆层与基体仍然保持着良好的冶金结合。添加不同含量M2高速钢合金粉末的复合熔覆层的硬度都高于M0试样,且加入15%M2高速钢合金粉末的熔覆层的平均摩擦系数和磨损率小于M0熔覆层。

Laser cladding and laser shock strengthening were used to strengthen the surface of automobile die steel,and the effect of the powder content of M2 high speed steel on the microstructure,phase composition and wear resistance of the cladding layer was studied.Moreover,the effect of laser shock strengthening on the wear resistance of the cladding layer was discussed.Results showed that in addition to theα-Fe,γ-Fe,M23C6 and M7C3 phases in the cladding layer of M0 sample,the cladding layer with adding M2 high speed steel alloy powder also had the MC,M2C and M6C phases with higher hardness.The increase of M2 high speed steel powder content was helpful to refine the microstructure of the composite cladding layer,and the cladding layer still maintained a good metallurgical combination to the substrate.Moreover,the hardness of composite cladding layer with different content of M2 high speed steel alloy powder was higher than that of M0 sample.The average friction coefficient and wear rate of the cladding layer with M2 high speed steel alloy powder were lower than those of M0 cladding layer.