The present study focuses on the experimental investigation of the precipitation and dislocation induced strain hardening behavior and related microstructural evolution of the heat-treated 17-4 PH stainless steel. Tensile and compression tests were carried out at an ambient temperature, using a nominal strain rate of $1\times {10}^{-3}{s}^{-1}$ to evaluate the precipitation induced flow stress characteristics of the stainless steel grade in correlation with its microstructural attributes. Differential Crussard-Jaoul (C-J) analysis was performed to quantify the role of precipitate in governing the strain hardening rate. It has illustrated the multiple stages of strain hardening depicting the impact of microstructural constituents on the strain hardening behavior. Peak strength and hardening of the H900 condition, caused mainly due to the coherency of precipitates within the lath matrix, can be deduced from the increase in the precipitation-sensitive microstrain and dislocation density.

本研究致力于热处理后的17-4 PH不锈钢的析出和位错诱发的应变硬化行为以及相关的组织演变的实验研究。拉伸和压缩测试在环境温度下进行，标称应变率为$\mathrm{1个}\times {10}^{--3}{s}^{--\mathrm{1个}}$评估析出的不锈钢牌号的流动应力特性及其显微组织属性。进行了差分Crussard-Jaoul（CJ）分析，以量化沉淀物在控制应变硬化速率中的作用。它说明了应变硬化的多个阶段，描绘了微观结构成分对应变硬化行为的影响。H900条件的峰值强度和硬化主要归因于板条基体内部沉淀的相干性，可以从对沉淀敏感的微应变和位错密度的增加中得出。