黄重,张可,徐党委,孟少博,王新志,杜海明,张熹

• 1:安阳钢铁集团有限责任公司
• 2:安徽工业大学冶金工程学院
• 3:天津大桥焊材集团有限公司

摘要(Abstract)：

为了深入了解Q500qENH钢在连续冷却相变过程中组织及硬度的变化及原因，通过热膨胀法和金相-硬度法绘制了Q500qENH钢的动态连续冷却转变曲线(CCT曲线),研究了冷却速度对其组织、硬度及相变行为的影响。结果表明：冷速在0.1～0.3℃/s时，试验钢的组织为多边形铁素体和少量珠光体与贝氏体；冷速在0.5～10℃/s时，组织主要为粒状贝氏体，冷速在15～30℃/s时，组织主要为板条贝氏体和粒状贝氏体，随着冷速的增大，粒状贝氏体的含量逐渐降低，板条贝氏体的含量不断增加，在25～30℃/s较大冷速时，有极少量的马氏体产生。随着冷速由0.1℃/s增加至30℃/s,试验钢的硬度基本呈线性增大，由154 HV0.2增加至352 HV0.2,基体组织的细化是硬度不断增大的主要因素。

关键词(KeyWords)： 桥梁耐候钢;CCT曲线;贝氏体;冷却速度;硬度

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51704008);; 河南省博士后科研启动项目(202103098)

作者(Author): 黄重,张可,徐党委,孟少博,王新志,杜海明,张熹

DOI: 10.13289/j.issn.1009-6264.2022-0195

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