17-4PH不锈钢连续冷却转变及相变动力学

doi:10.13251/j.issn.0254-6051.2022.06.031

摘要/Abstract

摘要： 通过热模拟试验、X射线衍射、扫描电镜(SEM)、透射电镜(TEM)等方法研究了17-4PH不锈钢连续冷却转变行为、奥氏体稳定化以及马氏体相变动力学。研究发现,在0.05~5 ℃/s冷却速度范围内,17-4PH不锈钢只发生马氏体转变,Ms和Mf分别为116 ℃和35 ℃;在0.05~0.3 ℃/s冷速范围内出现奥氏体稳定化现象,当冷速≥0.5 ℃/s时奥氏体稳定化现象消失。在0.05~5 ℃/s冷速范围内,试验钢中都有少量的NbC析出;而在冷速≤0.08 ℃/s时,试验钢中可析出一定数量弥散的纳米ε-Cu颗粒。此外,根据试验数据构建了预测17-4PH不锈钢马氏体相变动力学的K-M方程。

关键词: 17-4PH不锈钢, 连续冷却转变, 组织, 奥氏体稳定化, 相变动力学

Abstract: Continuous cooling transformation behavior, austenite stabilization and martensite phase transformation kinetics of the 17-4PH stainless steel were investigated by means of thermal dilatometry method, X-Ray, SEM and TEM. The results show that only martensite transformation occurs at the cooling rate range of 0.05-5 ℃/s, and the Ms and Mf are 116 ℃ and 35 ℃, respectively. It is found that the austenite stabilization occurs at cooling rate range of 0.05-0.3 ℃/s, but this phenomenon disappears when the cooling rate ≥0.5 ℃/s. In the cooling rate range of 0.05-5 ℃/s, a small amount of NbC are precipitated in the tested steel. While when the cooling rate ≤0.08 ℃/s, a certain amount of dispersed nano-sized ε-Cu particles are precipitated in the tested steel. Based on experimental data, the Koistinen-Marburger equation is finally established to predict the martensite transformation kinetics of the 17-4PH stainless steel.

Key words: 17-4PH stainless steel, continuous cooling transformation, microstructure, austenite stabilization, phase transformation kinetics

中图分类号:

TG142.1⁺2

吴轲源, 刘云鹏, 李孔斋, 徐良乐. 17-4PH不锈钢连续冷却转变及相变动力学[J]. 金属热处理, 2022, 47(6): 161-167.

Wu Keyuan, Liu Yunpeng, Li Kongzhai, Xu Liangle. Continuous cooling transformation and phase transformation kinetics of 17-4PH stainless steel[J]. Heat Treatment of Metals, 2022, 47(6): 161-167.

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