Abstract: Effect of ageing treatment at 480 ~ 620 °C for 4 h on structure and mechanical properties of steel 15-5PH (/% ：0. 065C, 0. 46Si, 0. 58Mn, 0. 022P、0. 004S, 14. 77Cr, 5. 19Ni, 2. 91 Cu, 0. 22Nb) solid-solution-treated at 1 000 T and 1 040°C  for 30 min water cooling has been studied. Results show that with ageing at 480 °C for 4 h, the copper- rich phases and carbide Nb( C, N) begin to precipitate, and with increasing ageing temperature, partial precipitates coarsen ；with ageing at 550 °C the steel 15-5PH has optimum comprehensive mechanical properties i. e. yield strength R_p0.2, 530 -625 MPa, tensile strength R_m 1 050 ~ 1 070 MPa and impact energy value a_kv 113 〜115 J /cm².

摘要： 研究了1000℃和1040℃30min水冷固溶480～620℃4 h时效对15-5PH钢(/%:0.065C、0.46Si、0.58Mn、0.022P、0.004S、14.77Cr、5.19Ni、2.91 Cu、0.22Nb)组织和力学性能的影响。结果表明,该钢在480℃4 h时效后,开始析出富铜相和碳化物Nb(C,N),随时效温度升高,部分析出相长大;550℃时效15-5PH钢具有最佳综合力学性能:屈服强度R_p0.2530～625 MPa,抗拉强度R_m1050～1070 MPa,冲击功值a_kv113～115 J/cm²。