17-4PH不锈钢连续冷却转变及相变动力学  

Continuous cooling transformation and phase transformation kinetics of 17-4PH stainless steel

作　　者：吴轲源 刘云鹏 李孔斋[1] 徐良乐 Wu Keyuan;Liu Yunpeng;Li Kongzhai;Xu Liangle(Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology Kunming,Kunming Yunnan 650500,China;Ma'anshan Xuyang Machinery Co.,Ltd.,Ma'anshan Anhui 243121,China)

机构地区：[1]昆明理工大学冶金与能源工程学院,云南昆明650500 [2]马鞍山旭阳机械有限公司,安徽马鞍山243121

出　　处：《金属热处理》2022年第6期161-167,共7页Heat Treatment of Metals

基　　金：安徽省重点研究计划(1804a09020067)。

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。Continuous cooling transformation behavior, austenite stabilization and martensite phase transformation kinetics of the 17-4 PH 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 17-4 PH stainless steel.

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 

分 类 号：TG142.12[一般工业技术—材料科学与工程]