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为提高45钢表面硬度,采用CO2激光器在45钢表面进行激光硼合金化处理,通过正交试验方法优化激光硼合金化工艺,研究合金层的组织和性能。结果表明:45钢激光硼合金化的最佳工艺参数为激光功率4 k W,扫描速度8 mm/s,KBF4的质量分数3%;经该工艺处理后的合金化层分为合金层、过渡区;合金层厚度约为860μm,组织为Fe2B及少量α-Fe,表层组织形态呈胞状,次表层呈树枝状,平均硬度为1 350HV0.1;过渡区厚度约为100μm,硬度从1 350HV0.1到230HV0.1呈梯度分布。
In order to improve the surface hardness of 45 steel, laser boron alloying treatment was carried out on the surface of 45 steel with CO2 laser, and the laser boron alloying process was optimized by orthogonal test to study the microstructure and properties of the alloy layer. The results show that the optimum technological parameters of boron laser alloying for 45 steel are 4 k W laser power, 8 mm / s scanning speed and 3% mass fraction of KBF4. The alloying layer treated by this process is divided into alloy layer, The thickness of the alloy layer is about 860μm, and the microstructure is Fe2B and a small amount of α-Fe. The morphology of the surface layer is cellular, the sub-surface is dendritic, the average hardness is 1 350HV0.1; the thickness of transition zone is about 100μm and the hardness is 1 350HV0. 1 to 230HV0.1 gradient distribution.