强磁场对 Fe-C-W 合金钢马氏体组织回复的影响  

Effect of high magnetic field on recovery of martensitic structure in a Fe-C-W alloy steel

作　　者：吴光辉 蔡焕 昝启飞 胡锋 WU Guang-hui;CAI Huan;ZAN Qi-fei;HU Feng(Hengyang Valin Steel Tube Co Ltd,Hengyang 421001,China;Hubei Key Laboratory of Metallurgical Industry Process System Science,Wuhan University of Science and Technology,Wuhan 430081,China;Hubei Collaborative Innovation Center for Advance Steel,Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]衡阳华菱钢管有限公司,湖南衡阳421001 [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

出　　处：《材料热处理学报》2024年第8期164-172,共9页Transactions of Materials and Heat Treatment

基　　金：湖南省“小荷”人才计划;湖南省芙蓉计划湖湘青年英才项目(2023RC3254)。

摘　　要：强磁场作为重要的金属相变影响因素,可以明显提高奥氏体到马氏体相变的开始温度并影响最终的马氏体微观组织。然而,关于强磁场对马氏体回复影响的研究甚少。研究了强磁场对Fe-C-W合金钢在不同温度回火1 h后马氏体组织回复的影响。结果表明,强磁场的施加使基体中碳化物的数密度明显增加,其原因为强磁场增大了碳化物的磁化强度,降低了其磁自由能,使其形核驱动力增加。低温200℃回火时强磁场对马氏体回复的抑制作用不明显。当回火温度升高至500℃时,12 T强磁场的施加,明显增强了碳化物对位错运动的阻碍作用,大大抑制了位错的回复,使基体中残留的位错密度提高了约27.5%。高密度的位错明显增加了小角度晶界的含量,使马氏体板条平均宽度降低了约137 nm,表明强磁场的施加明显抑制了马氏体的回复。High magnetic field,as an important factor affecting metal phase transformation,can significantly increase the starting temperature of austenite to martensite transformation and affect the final microstructure of martensite.However,there is little research on the effect of high magnetic fields on martensitic recovery.The effect of high magnetic field on the recovery of martensitic structure in Fe-CW alloy steel after tempering at different temperatures for 1 h was studied.The results show that the application of a high magnetic field significantly increases the number density of carbides in the matrix.The reason for this is that the high magnetic field increases the magnetization intensity of carbides,reduces their magnetic free energy,and increases their nucleation driving force.The inhibitory effect of high magnetic field on martensitic recovery is not significant during low-temperature tempering at 200℃.When the tempering temperature increases to 500℃,the application of a 12 T high magnetic field significantly enhances the hindering effect of carbides on dislocation movement,greatly suppressing the recovery of dislocations,and increasing the residual dislocation density in the matrix by about 27.5%.High density dislocations significantly increase the content of small angle grain boundaries,reducing the average width of martensite lath by about 137 nm,indicating that the application of high magnetic field significantly inhibits the recovery of martensite.

关 键 词：强磁场 马氏体回复 碳化物 位错 小角度晶界 

分 类 号：TG142.3[一般工业技术—材料科学与工程]