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本文根据光学金相、扫描电镜、x—射线衍射、电子探针等分析发现,渗硼共晶化组织有两类共晶:(r+Fe_2B)及[r+Fe_3(C、B)]。渗硼共晶化处理后,工业纯铁及低碳铜生成r+Fe_2B共晶,组织呈骨骼状;高碳铜生成[r+Fe_3(C、B)]共晶,其中包有少量Fe_2B,组织呈菊花状;中碳铜是骨骼状与菊花状两种共晶的混合。耐磨性试验后证明:含Fe_2B共晶层的耐磨性侊于含Fe_3(C、B)共晶层;A_3钢的渗硼共晶层淬火后,在0.52m/s～1.843m/s摩擦速度范围内,其耐磨性优于硼化层Fe_2B。本文分别探讨了渗硼共晶层形成及磨损机理。
According to the analysis of optical metallography, scanning electron microscopy, x-ray diffraction and electron probe, there are two types of eutectic boronizing: (r + Fe_2B) and [r + Fe_3 (C, B)]. Boron eutectic treatment, the industrial pure iron and low carbon copper r + Fe_2B eutectic, the structure was skeletal; high carbon copper generated [r + Fe_3 (C, B)] eutectic, which contains a small amount of Fe_2B, The tissue is chrysanthemum; medium carbon copper is a mixture of bone and chrysanthemum-like eutectic. After the wear resistance test, it is proved that the wear resistance of the Fe 2 B -containing eutectic layer is in the range of 0.52 m / s to 1.843 m / s after the boron-doped eutectic layer of A 3 steel is hardened, Within the friction speed range, its wear resistance is better than the boride layer Fe_2B. In this paper, the formation of boronizing eutectic layer and the wear mechanism were discussed respectively.