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沉淀硬化不锈钢是含铝、钛、铌和铜等沉淀硬化元素的铁-镍-铬合金。沉淀硬化过程包括非常细小的金属间相的形成(析出),如Laves相Fe_2(Mo,Nb),Ni_3M(M:Al,Ti,Nb,Cu,V,Mo,W),Nb(C,N)和碳氮化物Ti(C,N)及碳化物Fe_3Nb_3C(M_6C)。本文对沉淀硬化钢进行了渗硼处理,为了提高硬度和耐磨性,该钢以铌作硬化剂。钢的成分为0.03C-0.22Si-17.86Cr-3.91Ni-2.14Mo-1.96Nb(质量分数,%)。渗硼在添加10%Al的熔融硼砂中进行,温度1 100℃,时间4 h,油冷,随后于500℃时效。结果获得了硬度高、耐磨性好的硼化物层。
Precipitation hardening stainless steel is an iron-nickel-chromium alloy containing precipitation hardening elements such as aluminum, titanium, niobium and copper. The precipitation hardening process includes the formation of very fine intermetallic phases such as Laves phase Fe 2 (Mo, Nb), Ni 3 M (M: Al, Ti, Nb, Cu, V, Mo, W) ) And carbonitrides Ti (C, N) and carbides Fe_3Nb_3C (M_6C). In this paper, boronizing treatment of precipitation hardened steel, in order to improve the hardness and wear resistance, the steel niobium as hardener. Steel composition 0.03C-0.22Si-17.86Cr-3.91Ni-2.14Mo-1.96Nb (mass fraction,%). Boronizing was carried out in molten borax with addition of 10% Al at a temperature of 100 ° C for 4 h, oil cooling followed by aging at 500 ° C. As a result, a high-hardness and wear-resistant boride layer was obtained.