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  4. 等温压缩对高强度汽车钢WHT1300HF的马氏体相变及微观组织的影响

钢铁研究学报, 2014, 26(8): 69-78. doi: 10.13228/j.b0yuan.issn1001-0963.20130319

等温压缩对高强度汽车钢WHT1300HF的马氏体相变及微观组织的影响

刘凯 1, , 池波 2, , 蒲健 3, , 李箭 4,

1.华中科技大学材料科学与工程学院,湖北武汉430074;武汉钢铁(集团)公司研究院,湖北武汉430081

2.华中科技大学材料科学与工程学院,湖北武汉430074

3.华中科技大学材料科学与工程学院,湖北武汉430074

4.华中科技大学材料科学与工程学院,湖北武汉430074

关键词： 高强度钢 , 等温形变 , 小角度晶界 , 微观组织 , 马氏体转变温度

Effect of Isothermal Compression on Martensite Transformation and Microstructure of High Strength Automobile Steel WHT1300HF

Keywords： high strength steel , isothermal deformation , small-angle grain boundary , microstructure , martensite phase transformation temperature

通过等温形变研究了形变参数(形变温度、形变速率、形变量)对高强度汽车钢WHT1300HF的微观组织转变和形貌的影响规律.研究结果表明:增加奥氏体等温形变量,有利于铁素体的缺陷形核,促进了形变奥氏体向铁素体转变;奥氏体的形变强化导致马氏体相变阻力增大,马氏体相变开始温度(Ms)下降,细小晶粒数量和小角度晶界数量增多;增加奥氏体等温形变(40％)速率能同时促进马氏体和铁素体相变,但马氏体体积分数和小角度晶界数量减少,细小晶粒数量略有提高;降低等温形变温度加剧奥氏体的形变强化,导致Ms温度下降,马氏体体积分数、小角度晶界比例减少,细小晶粒数量增多,铁素体含量明显增加.

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