谭传成,王文礼,高兴健,罗健

• 1:西安建筑科技大学冶金工程学院
• 2:宝钢湛江钢铁有限公司制造管理部

摘要(Abstract)：

采用Gleeble-3500型热模拟机对DP1180钢进行热模拟实验，研究其连续冷却转变行为，采用切线法结合显微组织分析，绘制其动态连续冷却转变(CCT)曲线；分析了不同冷速对DP1180钢的室温显微组织、显微硬度及析出物种类的影响。结果表明：当冷速≤1℃/s时，DP1180钢的显微组织以铁素体和粒状贝氏体为主；当冷速为5～40℃/s时，随冷速的增大，显微组织中马氏体占比逐渐增多；冷速为60℃/s时，显微组织几乎完全马氏体化；随着冷速的增大，DP1180钢的显微硬度也因马氏体组织占比的增多和形态演变逐渐增大；动态CCT曲线显示，铁素体、贝氏体和马氏体相变温度分别为454.0～666.1℃、377.4～514.3℃和206.0～429.4℃,冷速的增大使马氏体相变开始温度(M_s点)升高；透射电镜结果显示，当冷速≥1℃/s时，纳米渗碳体在贝氏体或马氏体中析出，其形态随冷速的增大由颗粒状转变为棒状，当冷速为5℃/s和25℃/s时析出微合金碳氮化物，冷速为40℃/s时则在板条马氏体中析出球状SiO_2。

关键词(KeyWords)： DP1180钢;热模拟;硬度;动态CCT曲线;析出物

Abstract:

Keywords:

基金项目(Foundation): 宝钢湛江钢铁科研项目(2023035)

作者(Author): 谭传成,王文礼,高兴健,罗健

DOI: 10.13289/j.issn.1009-6264.2025-0103

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