强磁场对Fe-0.1C-2W钢回火过程微观组织的影响  

Effect of strong magnetic field on microstructure of Fe-0.1C-2W steel during tempering

作　　者：权薛玲 侯廷平[1,2,3,4] 张东 尹朝朝[3,4] Tsepelev Vladimir 吴开明 Quan Xueling;Hou Tingping;Zhang Dong;Yin Chaochao;Tsepelev Vladimir;Wu Kaiming(College of Science,Wuhan University of Science and Technology,Wuhan 430081,China;Hubei Province Key Laboratory of Systems Science in Metallurgical Process,Wuhan University of Science and Technology,Wuhan 430081,China;State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China;Hubei Collaborative Innovation Center for Advanced Steels,Wuhan University of Science and Technology,Wuhan 430081,China;Liquid Metal Physics Research Center,Ural Federal University,Yekaterinburg 620002,Russia)

机构地区：[1]武汉科技大学理学院,湖北武汉430065 [2]武汉科技大学冶金工业过程系统科学湖北省重点实验室,湖北武汉430081 [3]武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北武汉430081 [4]武汉科技大学高性能钢铁材料及其应用省部共建协同创新中心,湖北武汉430081 [5]俄罗斯乌拉尔联邦大学液态金属物理研究中心,乌拉尔联邦区叶卡捷琳堡620002

出　　处：《武汉科技大学学报》2022年第6期401-408,共8页Journal of Wuhan University of Science and Technology

基　　金：国家自然科学基金面上资助项目(12174296);湖北省重点研发计划资助项目(2021BAA057);武汉市应用基础前沿资助项目(2019010701011382);2019年度湖北省高等学校优秀中青年科技创新团队计划资助项目(T201903);“111计划”资助项目(D18018)。

摘　　要：借助OM、SEM、TEM、XRD等手段,研究了强磁场对Fe-0.1C-2W钢在200℃回火过程中微观组织演变的影响,同时将磁场因素引入修正的Williamson-Hall方法,对钢中位错密度进行理论计算。结果显示,12 T强磁场作用促进了钢中马氏体板条回复,位错密度显著降低,这是因为强磁场促进基体中原子迁移以及削弱柯氏气团对位错的钉扎作用;此外,强磁场作用下钢中Fe_(3)C碳化物数量显著增加,其热力学本质是磁场影响了Fe_(3)C的磁自由能,其形核势垒降低,形核率增大,进而促进了Fe_(3)C的析出。By means of OM,SEM,TEM,XRD,the effect of strong magnetic field on the microstructure evolution of Fe-0.1C-2W steel during tempering at 200℃was studied;meanwhile,the magnetic field factor was introduced into the modified Williamson-Hall method to theoretically calculate the dislocation density of steel.The results show that the application of 12 T strong magnetic field promotes the recovery of martensitic laths,and the dislocation density is significantly reduced.This is because the strong magnetic field promotes the migration of atoms in matrix and weakens the effect of Cottrell atmosphere on dislocation pinning.In addition,the amount of Fe_(3)C carbide precipitating in steel increases significantly under the action of a strong magnetic field.The thermodynamic mechanism is that the magnetic field affects the magnetic free energy of Fe_(3)C carbides,which reduces the nucleation potential barrier and increases the nucleation rate,thereby promoting the precipitation of Fe_(3)C.

关 键 词：Fe-0.1C-2W钢 强磁场 回火 马氏体 位错密度 Fe 3C碳化物 微观组织 

分 类 号：TG142.1[一般工业技术—材料科学与工程]