大形变铁素体钢丝α→γ→α相变织构遗传现象  

Texture inheritance during α→γ→α phase transformation in high strain deformed ferrite steel wire

作　　者：曾一平 周立初 闵学刚 方峰[1] 蒋建清[1,3] Zeng Yiping;Zhou Lichu;Min Xuegang;Fang Feng;Jiang Jianqing(School of Materials Science and Engineering,Southeast University,Nanjing 211189,China;Jiangsu Baosteel Fine Wire&Cord Co.,Ltd.,Haimen 226100,China;School of Materials Science and Engineering,Nanjing Forestry University,Nanjing 210037,China)

机构地区：[1]东南大学材料与科学工程学院,南京211189 [2]江苏宝钢精密钢丝有限公司,海门226100 [3]南京林业大学材料科学与工程学院,南京210037

出　　处：《东南大学学报（自然科学版）》2018年第4期619-628,共10页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51371050);江苏省"六大"人才高峰资助项目(2015-XCL-004);江苏省产学研前瞻性研究资助项目(BY2016076);江苏省重点研发计划资助项目(BE2015097);江苏省科技成果转化专项资助项目(BA2017112)

摘　　要：利用扫描电子显微镜(SEM)和电子背散射衍射技术(EBSD)研究了冷拔铁素体钢丝经奥氏体化热处理后的遗传织构,以及相变过程中晶体位向变化的特点.结果表明:随着应变量的上升,大形变冷拔铁素体钢丝的〈110〉丝织构强度上升;奥氏体化热处理后,等轴状铁素体组织保留了部分〈110〉丝织构,发生织构遗传;遗传织构强度受到热处理工艺参数影响,提高奥氏体化保温温度或延长保温时间,能使择优的奥氏体晶粒发生长大,进而使相变后铁素体〈110〉织构强度增加.经过α→γ→α相变后,组织中50°与60°晶界所占比例明显高于理论分布,这些晶界符合K-S关系下同一密排面变体或孪晶间位向关系,说明发生变体选择现象,相变倾向于以同一密排面上变体或孪晶的形式发生,这有利于织构的遗传及遗传织构稳定性的提升.The inherited texture after heat-treatment and the changes of the crystal orientation of ferrite grains of cold drawn ferrite steel wires during transformation were investigated by using SEM(scanning electron microscopy)and EBSD(electron backscatter diffraction).The results show that the intensity of〈110〉fiber ferrite texture is enhanced with the increase of cold drawing strains.Cold drawn ferrite〈110〉texture is partially conserved after austenitizing heat treatment,i.e.texture inheritance.The intensity of inherited texture is influenced by heat treatment parameters.With the increase of austenitizing temperature and time,the preferred austenite crystal tends to grow up,and result in the increase of intensity of〈110〉fibre inherited texture.Afterα→γ→αtransformation,the occurrence of grain boundaries with 50°and 60°misorientation is in a significantly higher proportion than the theoretical proportion.The 50°and 60°boundaries conform to the relationship between variants in the same close-packed planes or the twin relationship under the K-S relation.Thus,variant selection occurs preferably in the form of twins or variants in the same close-packed plane,which is conducive to the inheritance of texture and the stability of the inherited texture.

关 键 词：铁素体钢丝 奥氏体化热处理 遗传织构 变体选择 

分 类 号：TG142[一般工业技术—材料科学与工程]