姚纪坛,孙力,年保国,潘进,罗扬,任帅,赵楠

• 1:河钢集团钢研总院

摘要(Abstract)：

通过膨胀法结合金相-硬度法测定了一种低镍高强耐候钢的奥氏体连续冷却转变(CCT)曲线,研究了冷却速度对其显微组织和硬度的影响。结果表明:该钢屈服强度为510 MPa,屈强比为0.74,-40℃下的冲击吸收能量为72.8 J,耐蚀性显著优于Q345B;临界点温度A_(c1)为730℃,A_(c3)为871℃,M_s为383℃;当冷却速度由0.1℃/s增加到100℃/s,实验钢显微硬度值由142 HV0.5增大至320 HV0.5,并依次发生铁素体转变、珠光体转变、贝氏体转变和马氏体转变,其中当冷却速度超过20℃/s时,珠光体消失,组织主要由贝氏体和马氏体组成。

关键词(KeyWords)： 低镍高强耐候钢;CCT曲线;显微组织

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 姚纪坛,孙力,年保国,潘进,罗扬,任帅,赵楠

DOI: 10.13289/j.issn.1009-6264.2020-0212

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