Effect of solution cooling method on microstructure and mechanical properties of 17-4PH steel

doi:10.13251/j.issn.0254-6051.2020.05.011

Abstract

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

CLC Number:

TG161

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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