刘洋,麻衡,吴红艳,高秀华,杜林秀

• 1:数字钢铁全国重点实验室
• 2:莱钢银山钢铁有限公司

摘要(Abstract)：

采用Formaster-FⅡ全自动相变仪测定了新型Q690 MPa级别V-N微合金化中厚板在未变形和变形条件下的连续冷却转变曲线(CCT)。结果表明：随着冷速的增加，未变形和变形试样的显微组织中珠光体、多边形铁素体和粒状贝氏体逐渐减少，针状铁素体和板条贝氏体逐渐增多；与静态CCT曲线相比，动态CCT曲线铁素体相变开始温度提高，相变温度区间明显增大；在奥氏体区进行变形能够增加晶内空位和位错等缺陷，促进V(C, N)析出，为针状铁素体相变提供更多形核点；同时变形能够提高铁素体相变驱动力，促进针状铁素体相变；在冷却速率为5℃/s时，变形试样中出现大量的针状铁素体组织。

关键词(KeyWords)： V-N微合金化;中厚板;奥氏体变形;连续冷却转变曲线

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 刘洋,麻衡,吴红艳,高秀华,杜林秀

DOI: 10.13289/j.issn.1009-6264.2025-0344

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