Abstract: The test steel 00Cr13Ni7Co5Mo4W (/% ： 0.007C, 13.23Cr, 7.02Ni, 5.06Co, 3.72Mo, 0.96W) is melted by a 50 kg vacuum induction furnace, cast to 10 kg ingot, forged to 55 mm x 55 mm billet and rolled to 3 mm x 60 mm strip. The precipitating behavior of the steel is analyzed by thermodynamic calculation software Thermo-Calc, and the structure, mechanical properties and corrosion performance of the steel are studied by optical, transmission electron microscope and potentiodynamic polarization method. Results show that R phase is main strengthening phase in the maraging stainless steel during aging process ； in order to get fine, dispersed R phase and better combination of strength-toughness of steel, the optimum heat treated process is defined that is solid-solution treating at 1100 ℃ + aging at 490 ℃ , and the tensile strength, yield strength and elongation of the steel are respectively 1450 MPa, 1320 MPa and 10.8% ； the breakdown potential and the annual corrosion rate in artificial sea water of maraging stainless steel 00Cr13Ni7CoMo4W are respectively 230 mV and 1.51 μm/a, it has better corrosion resistance.

Key words: Maraging Stainless Steel 00Cr13Ni7Co5Mo4W, R Strengthening Phase, Thermodynamic Calculation, Mechanical Property, Polarization Curve

摘要： 试验用00Cr13Ni7Co5Mo4W钢(/%:0.007C,13.23Cr,7.02Ni,5.06Co,3.72Mo,0.96W)由50 kg真空感应炉熔炼,铸成10 kg锭,锻成55 mm×55 mm方坯并轧成3 mm×60 mm带材。利用热力学计算软件ThermoCalc分析该钢的析出行为,并采用金相显微镜、透射电镜和动电位极化法,研究了该钢的组织结构、力学性能和腐蚀性能。结果表明,R相是马氏体时效不锈钢在时效处理过程中的主要强化相;为获得细小、弥散的R相和良好的强韧性配合,确定最佳热处理工艺为1100℃固溶+490℃时效,钢的抗拉强度、屈服强度和伸长率分别为1 320MPa、1 450 MPa和10.8%;马氏体时效不锈钢00Cr13Ni7Co5Mo4W点蚀击穿电位为230 mV,人工海水中年平均腐蚀率为1.51μm/a,具有较好的耐腐蚀性能。

关键词: 马氏体时效不锈钢00Cr13Ni7Co5Mo4W, R强化相, 热力学计算, 力学性能, 极化曲线