姜超,单忠德,庄百亮,戎文娟,张密兰

• 1:机械科学研究总院先进制造技术研究中心先进成形技术与装备国家重点试验室

摘要(Abstract)：

采用扫描及透射电镜观察和力学性能实验研究了22MnB5钢板热冲压成形件的组织形貌和力学性能。结果表明,加热温度930℃,保温4.5 min,初始成形温度850℃,冲压速度75 mm/s条件下,22MnB5钢板热冲压成形完成完全马氏体转变,得到均匀板条马氏体组织,组织内产生高密度位错,强度大幅提升,抗拉强度达到1550 MPa。形变有助于动态再结晶并获得更为细小的马氏体组织,促进细晶强化。硼元素在晶界发生偏聚,延长奥氏体转变孕育期,提高了22MnB5钢的淬透性,同时引起点阵畸变,促进相变强化。

关键词(KeyWords)： 22MnB5钢;热成形;相变强化

Abstract:

Keywords:

基金项目(Foundation): 国家国际科技合作项目(2011DFA50810);; 国家04科技重大专项(2011ZX04016-051)

作者(Author): 姜超,单忠德,庄百亮,戎文娟,张密兰

DOI: 10.13289/j.issn.1009-6264.2012.03.017

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