时效工艺对15-5PH钢低温力学性能的影响

Effeet of aging process on low temperature mechanical properties of 15-5PH steel

采用真空氢气退火炉以GJB8268—2014《航空用沉淀硬化不锈钢棒规范》内的H485、H495、H550、H580、H620五种制度为基础对15-5PH不锈钢进行固溶时效处理,研究了15-5PH钢室温和-50℃低温冲击性能和拉伸性能。结果表明,随着时效温度的升高,15-5PH钢的常温和低温抗拉强度呈逐渐降低趋势,冲击吸收能量和伸长率均呈逐渐升高的趋势。在H485制度下的低温冲击性能最差,最低冲击吸收能量在10J左右。H550制度下低温冲击性能明显提高,冲击吸收能量增加到72J,低温抗拉强度在1200MPa左右,具有较好的综合力学性能。

Solution and aging treatments of 15-5PH stainless steel were carried out by using vacuum hydrogen annealing furnace on the basis of H485,H495,H550,H580 and H620 processes in GJB 8268-2014 Specification for precipitation-hardening stainless steel bars for aviation,and the impact and tensile properties at room temperature and-50 ℃ low temperature were studied.The results show that with the increase of aging temperature,the tensile strengths of the 15-5PH steel at room temperature and low temperature decrease,and the impact absorbed energy and elongation increase gradually.The low temperature impact property of the 15-5PH steel under H485 process is the worst,and the lowest impact absorbed energy is about 10 J.The low temperature impact property under H550 process is significantly increased,the impact absorbed energy is increased to 72 J,and the low temperature tensile strength is about 1200 MPa,which shows good comprehensive mechanical properties.