激光功率对Ni60A合金熔覆层组织、显微硬度及耐磨性的影响

Effect of Laser Power on Microstructure,Microhardness and Wear Resistance of Ni60A Alloy Cladding Layer

以Ni60A合金粉末为熔覆材料,在Q235钢基体表面制备合金涂层,通过单因素对比实验法,考察激光功率对Ni60A合金熔覆层的组织形貌、显微硬度及耐磨性的影响。研究发现:1)在三种激光功率(2.5 kW、3 kW、3.5 kW)下,均能够形成无裂纹的涂层,组织以树枝晶为主;2)在小功率下,熔覆层中枝晶尺寸较小,平均显微硬度较大,平均摩擦系数较低,材料的耐磨性较高;3)在2.5 kW激光功率下,熔覆层最高硬度是基体硬度的4.6倍,摩擦系数较小,可以最为有效地提高低碳钢表面硬度及耐磨性。

The alloy coating is prepared on the surface of Q235 steel substrate with Ni60A alloy powder as cladding material.The effects of laser power on the microstructure,microhardness and wear resistance of Ni60A alloy cladding layer are investigated by single factor comparison experiment.It is found that:1)Under three laser powers(2.5 kW,3 kW,3.5 kW),crack-free coatings can be formed,and dendrite is the main microstructure;2)Under low power,the dendrite size in the cladding layer is smaller,the average microhardness is higher,the average friction coefficient is lower,and the wear resistance of the material is higher;3)Under the laser power of 2.5 kW,the highest hardness of cladding layer is 4.6 times that of substrate,and the friction coefficient is small,which can most effectively improve the surface hardness and wear resistance of low carbon steel.