固溶冷却方式对17-4PH钢显微组织及力学性能的影响

doi:10.13251/j.issn.0254-6051.2020.05.011

摘要/Abstract

摘要： 采用光学显微镜(OM)、透射电镜(TEM)及X射线衍射(XRD)等手段研究了固溶冷却方式对17-4PH马氏体不锈钢组织转变、强化相及力学性能的影响,阐释了Cu析出相在不同冷却方式下的析出规律及其对该钢力学性能的作用机制。结果表明,不同冷却方式下,Cu析出相的平均尺寸均在10~20 nm范围内。17-4PH钢的屈服强度随固溶冷却速率的增加而增加,塑性损失变化不大,冲击吸收能量随冷却速率的增加而降低,炉冷条件下的17-4PH钢的屈强比最低。17-4PH钢的强化机制主要为相变强化、析出强化及晶界强化,其中析出强化以切过机制为主。

关键词: 17-4PH钢, 固溶冷却方式, 显微组织, 力学性能, 析出相

Abstract: The influence of cooling method on microstructure evolution, strengthening phase and mechanical properties of the 17-4PH steel was investigated by means of OM, TEM and XRD test. The precipitation law of Cu phase under different cooling methods and its effect on strengthening mechanism of the 17-4PH steel were also discussed systematically. The results show that the average sizes of the Cu precipitated phase under different cooling methods are in the range between 10-20 nm. The yield strength of the steel increases with the increase of cooling rates while the ductility has a little change. And the impact absorbed energy of the 17-4PH steel decreases with the increase of cooling rates. The yield ratio has a lowest value under the condition of furnace cooling. The strengthening mechanism of the 17-4PH steel is mainly phase transformation strengthening, precipitation strengthening and grain boundary strengthening, and the precipitation strengthening is mainly based on the dislocation cutting mechanism.

Key words: 17-4PH steel, solution cooling method, microstructure, mechanical properties, precipitated phase

中图分类号:

TG161

孙永伟, 范芳雄, 王灵水. 固溶冷却方式对17-4PH钢显微组织及力学性能的影响[J]. 金属热处理, 2020, 45(5): 56-61.

Sun Yongwei, Fan Fangxiong, Wang Lingshui. Effect of solution cooling method on microstructure and mechanical properties of 17-4PH steel[J]. Heat Treatment of Metals, 2020, 45(5): 56-61.

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