赵四新,姚连登

• 1:宝山钢铁股份有限公司

摘要(Abstract)：

测定了选定低碳微合金成分体系的动态CCT曲线。当冷却速度在1～30℃/s之间时,钢板形成贝氏体组织,随冷却速度的增加,Bs点下降,贝氏体组织逐渐细化,钢板维氏硬度增加。采用大于等于20℃/s的冷速淬火到室温后,在610～650℃回火,试制了抗拉强度大于780 MPa的高强度钢板。钢板的屈服强度大于700 MPa,-40℃冲击功大于150 J,钢板在630℃回火获得了较好的强韧性匹配。钢板直接淬火态的微观组织由宽度为0.5～1.5μm的贝氏体铁素体板条和板条界面处的马奥组元构成。贝氏体板条内部有亚板条。回火热处理后,贝氏体板条界面弱化,球状的渗碳体在贝氏体板条边缘形成。仪器化冲击实验显示钢板在-40℃仍具有良好的止裂能力。钢板的贝氏体相变可用扩散机制较好地解释。

关键词(KeyWords)： 直接淬火-回火;高强钢;贝氏体;低温冲击韧性

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 赵四新,姚连登

DOI: 10.13289/j.issn.1009-6264.2011.03.020

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