核电用钢淬火过程温度场-组织场数值模拟及试验研究  

Numerical simulation and experimental study of temperature field and microstructure field during quenching of nuclear steel

作　　者：陆书萌 万莉 郑善举 李萌蘖 徐忠东 王辉 LU Shumeng;WAN Li;ZHENG Shanju;LI Mengnie;XU Zhongdong;WANG Hui(Faculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China;Inner Mongolia Zhongsheng Engineering Technology Co.Ltd.,Alashan 750300,China)

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093 [2]内蒙古中盛工程技术有限公司,内蒙古阿拉善750300

出　　处：《中南大学学报（自然科学版）》2024年第7期2527-2537,共11页Journal of Central South University:Science and Technology

基　　金：云南省“万人计划”青年拔尖人才资助项目(YNWR-QNBJ-2020-020);昆明理工大学自然科学研究基金资助项目(KKZ3202051043)。

摘　　要：为获得SA508Gr.4N钢末端淬火过程中温度场及组织场的变化规律,通过对非线性有限元模拟软件进行二次开发,建立SA508Gr.4N钢末端淬火过程中的温度-组织耦合的有限元模型,并通过实验对数值模拟结果进行验证。研究结果表明:所建立的温度-组织耦合模型计算结果与实验结果吻合良好,温度场的变化主要受综合换热系数影响;组织场模型适用于扩散型和非扩散型相变组织与维氏硬度的预测。随淬火端面的距离增大,试样组织呈现出由完全马氏体相到马氏体+贝氏体混合相的变化,维氏硬度逐渐降低,与温度-组织耦合模型计算得到的组织、硬度变化规律一致,因此,本文所提模型可以用于预测SA508Gr.4N钢末端淬火过程中温度场及组织场变化规律。In order to obtain the variation law of temperature and microstructure during end quenching of SA508Gr.4N steel,a finite element model of temperature-microstructure coupling during end quenching of SA508Gr.4N steel was established through the secondary development of nonlinear finite element simulation software,and the numerical simulation results were verified by experiments.The results show that the established temperature-microstructure coupling model calculation result is in good agreement with the experimental result,and the temperature field is mainly affected by the comprehensive heat transfer coefficient.The structure field model is suitable for predicting the microstructure and Vickers hardness of diffusive transformation and non-diffusive transformation.The microstructure of experimental sample changes from complete martensitic structure to martensitic+bainite mixed structure with the increase of the distance from the quenched end surface,and the Vickers hardness gradually decreases,which is consistent with the microstructure and hardness change law calculated by the temperature-microstructure coupling model.Thus,the proposed model can be used to predict the temperature field and microstructure field change law during the quenching process of SA508Gr.4N steel.

关 键 词：数值模拟 有限元法 末端淬火 SA508Gr.4N钢 

分 类 号：TG142.1[一般工业技术—材料科学与工程]