崔军,刘希琴,周双双,刘子利,侯志国

• 1:常熟开关制造有限公司
• 2:南京航空航天大学材料科学与技术学院

摘要(Abstract)：

通过正火热处理+20%冷轧变形+650℃高温回火1 h的工艺制备了高强度低温用结构钢,采用光学显微镜(OM)、扫描电镜(SEM)及力学性能测试研究了处理工艺对高强度细晶粒低温用结构钢组织与力学性能的影响。结果表明:冷轧变形后高温回火处理的试样显微组织由粗大多边形先共析铁素体、珠光体以及少量上贝氏体组成,800℃亚温正火处理试样组织为铁素体和回火粒状贝氏体,920℃、950℃完全正火处理后组织均由铁素体和珠光体组成。正火处理后试样晶粒尺寸均得到细化,晶粒尺寸随着正火温度的升高而增大。800℃亚温正火处理试样具有最佳的强韧性匹配,其屈服强度、抗拉强度分别为637 MPa、706 MPa,-20℃和-50℃下冲击吸收能量分别为63 J、40 J,比冷轧变形后高温回火处理试样的冲击韧性提高了约4倍。

关键词(KeyWords)： 高强度低温用结构钢;正火;变形;组织;力学性能

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 崔军,刘希琴,周双双,刘子利,侯志国

DOI: 10.13289/j.issn.1009-6264.2017-0334

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