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以45钢为基材对其表面进行固体粉末渗硼,探讨渗层生长行为及渗硼时间与渗层组织及性能的关系。结果表明,渗硼层由硼化物Fe2B构成,硼化物以长短不齐的方式垂直楔入基体形成连续针齿状层,与基体牢固结合。随渗硼时间延长,渗层厚度先快速增大后缓慢增加。渗层生长动力学符合抛物线规律。渗层显微硬度随渗层深度增加,先开始有所增加,后出现明显降低,最后缓慢降低。延长渗硼时间,渗硼深度增加,且显微硬度和耐磨性均能增加。
45 steel as the base material on the surface of the solid powder boron infiltration, to explore the growth behavior and infiltration of boron infiltration of the relationship between the microstructure and properties. The results show that the boronizing layer is composed of boride Fe2B, and the boride is vertically wedged into the substrate to form a continuous needle dentate layer in a short and short way, and is firmly bonded with the substrate. With the extension of boronizing time, the thickness of nitrided layer increased rapidly and then increased slowly. Penetration growth kinetics consistent with the parabolic law. The hardness of the infiltration layer increases with the depth of the infiltration layer, first increases, then decreases obviously and finally decreases slowly. Extend boronizing time, boron penetration depth increases, and the microhardness and wear resistance can increase.