热处理工艺对17-4PH不锈钢组织和力学性能的影响

Effect of heat treatment process on microstructure and mechanical properties of 17-4PH stainless steel

为研究17-4PH不锈钢的组织与性能,设计并实施热处理工艺方案,采用膨胀试验、金相观察、力学性能、硬度和冲击检测等方法,研究中间调整处理、固溶和时效温度对17-4PH钢组织、力学性能的影响。结果表明,中间调整处理可细化马氏体组织,碳化物颗粒在马氏体和奥氏体内析出,有较稳定的逆转变奥氏体形成。固溶温度提高,强度提升不明显;进行中间调整处理后,随时效温度提高,逆转变奥氏体组织含量增加,冲击性能提高,但强度明显降低。

In order to study structure and properties of 17-4PH stainless stel,a heat treatment process plan was designed and conducted,and then the effects of intermediate adjustment treatment,solution treatment and aging temperature on microstructure and mechanical properties of the 17-4PH steel were studied by means of thermal dilatometric test,metallographic observation,and tests of mechanical properties,hardness and impact property.The results show that the intermediate adjustment treatment can refine the martensite structure,the carbide particles are precipitated in the martensite and austenite,and there is a relatively stable reverse transformation austenite formation.When the solution treatment temperature increases,the increase of strength is not obvious.After the intermediate adjustment treatment,when the aging temperature increases,the content of the reverse transformed austenite structure increases,the impact property increases,but the strength decreases significantly.