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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Fe2（Mo，Nb），Ni3 M （M：Al，Ti，Nb，Cu，V，Mo，W），Nb （C，N）和碳氮化物Ti（C，N）及碳化物Fe3 Nb3 C （M6 C）。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1100℃，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 steels are iron-nickel-chromium alloys containing precipitation hardening elements such as aluminum,titanium,niobium and copper.The precipitation hardening process involves the formation (precipitation)of very fine intermetallic phases such as Laves phases-Fe2 (Mo,Nb);Ni3 M (M:Al, Ti,Nb,Cu,V,Mo,W);Nb(C,N)and Ti(C,N)(carbonitride)and Fe3 Nb3 C (M6 C carbides).In this work, boriding treatment was performed on a precipitation hardening steel,developed by us using niobium as a formative element of precipitated hardeners to increase hardness and wear resistance.The steel sample composition was 0.03C-0.22Si-17.86Cr-3.91Ni-2.14Mo-1.96Nb (in wt%).The boriding treatment was conducted in a molten borax bath with the addition of 10% aluminum at 1 100 ℃ for 4 hours.The cooling was performed in oil and the samples were subsequently aged at 500 ℃.Boride layers with high hardness and resistance to wear were obtained.