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通过对两三种烧结钢进行离子氮化处理,研究了烧结密度和添加的合金元素对其氮化特性的影响,得到下面的结果: (1)在表面生成的化合物层组织为ε—Fe_(2-3)N和γ′—Fe_4N两相。 (2)对于纯铁系试样,烧结密度越高,氮的表面扩散系数D值越大,氮化时获得的化合物层和扩散层厚度就越深。含Cu、Cr元素的合金系试样都比纯铁系试样的化合物层深,而扩散层浅。 (3)烧结密度对表面硬度的影响较大,试样的密度越大,表面硬度越高。含Cr的试样,离子氮化后,表面硬度明显上升,可达HV600以上。
The effects of sintering density and added alloying elements on the nitriding properties were investigated by ion nitriding two or three kinds of sintered steel. The following results were obtained: (1) The microstructure of the compound layer formed on the surface was ε-Fe_ ( 2-3) N and γ’-Fe_4N two phases. (2) For pure Fe-based samples, the higher the sintering density, the larger the surface diffusion coefficient D of nitrogen, and the deeper the thickness of the compound layer and diffusion layer obtained during nitriding. The alloy-based samples containing Cu and Cr elements were all deeper than the pure Fe-based samples and had a shallow diffusion layer. (3) The influence of sintering density on the surface hardness is larger, the greater the density of the sample, the higher the surface hardness. Cr-containing samples, ion nitriding, the surface hardness increased significantly, up to HV600 or more.