13Cr15Ni4Mo3N半奥氏体沉淀硬化不锈钢连续冷却过程中的相变动力学  

Phase transformation kinetics of 13Cr15Ni4Mo3N semi-austenitic precipitation hardening stainless steel during continuous cooling

作　　者：寻丹 罗俊鹏 张浩 胡可 李克 张梅 顾剑锋[3] 李传维[2,3] XUN Dan;LUO Jun-peng;ZHANG Hao;HU Ke;LI Ke;ZHANG Mei;GU Jian-feng;LI Chuan-wei(AECC South Industry Co Ltd,Zhuzhou 412002,China;School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Shanghai Key Laboratory of Materials Laser Processing and Modification,Shanghai 200240,China)

机构地区：[1]中国航发南方工业有限公司,湖南株洲412002 [2]上海交通大学材料科学与工程学院,上海200240 [3]上海市激光制造与材料改性重点实验室,上海200240

出　　处：《材料热处理学报》2024年第4期184-196,共13页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金面上项目(No.52171042)。

摘　　要：采用淬火相变膨胀仪研究了13Cr15Ni4Mo3N半奥氏体沉淀硬化不锈钢连续冷却过程的相变动力学行为。用改进的K-M方程准确描述了马氏体相变量与温度的关系。结果表明:实验钢的特征温度Ac1和Ac3分别为600和720℃;1040℃奥氏体化后以任意冷速冷却仅发生马氏体相变,冷速为100℃/s时测得的马氏体相变开始温度Ms为99℃,相变结束温度Mf为-75℃。在冷速≥1℃/s时,晶格膨胀法和杠杆法计算得到的马氏体相变量结果相近,而冷速<1℃/s时,晶格膨胀法计算得到的马氏体转变量大于杠杆法计算得到的马氏体转变量。在相变动力学参数α取值0.03258时,K-M方程可简单方便地描述实验钢的马氏体相变动力学过程,但对相变初期的转变量预测精度较低;改进的K-M方程在考虑α随温度变化时,可较准确地预测马氏体转变量。Phase transformation kinetics of 13Cr15Ni4Mo3N semi-austenitic precipitation hardening stainless steel during continuous cooling was studied using a quenching phase transformation dilatometer.The relationship between volume fraction of martensite and temperature is accurately described by the modified K-M equation.The results show that the critical temperatures Ac1 and Ac3 of the experimental steel are 600℃and 720℃,respectively.After austenitizing at 1040℃and cooling at any cooling rate,only martensitic transformation occurs during continuous cooling.The starting temperature Ms and finishing temperature Mf of martensite transformation are respectively determined as 99℃and-75℃during cooling with cooling rate of 100℃/s.The volume fraction of martensite calculated by lattice expansion method and lever method is similar when the cooling rate is≥1℃/s,while,the result calculated by lattice expansion method is larger than that calculated by lever method when cooling rate is<1℃/s.When the parameterαof phase transformation kinetics is 0.03258,the K-M equation can simply and conveniently describe the martensitic transformation kinetics process of the experimental steel,but the prediction accuracy of the transformation amount in the initial stage of phase transformation is relatively low.The modified K-M equation can accurately predict the amount of martensitic transformation when considering the variation ofαwith temperature.

关 键 词：13Cr15Ni4Mo3N 沉淀硬化不锈钢 连续冷却 相变动力学 K-M方程 

分 类 号：TG142.7[一般工业技术—材料科学与工程]