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
Key words
numerical simulation/finite element method/end quenching/SA508Gr.4N steel
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基金项目
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)
Yunnan Ten Thousand Talents Plan Young&Elite Talents Program()
Natural Science Research Foundation of Kunming University of Science and Technology()
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