缑瑞宾,徐浩,于敏,师泽宇,石文可

• 1:安徽科技学院机械工程学院
• 2:北京工业大学材料与制造学部
• 3:安徽科技学院建筑学院

摘要(Abstract)：

为了揭示极端高温暴晒服役条件和火灾服役条件下DP800钢的力学性能，采用“加热-保温-空冷”与“加热-保温-水冷”方法分别模拟两种高温服役条件，通过显微组织观测和静载拉伸试验研究高温服役后DP800钢的微观组织形貌特征和力学性能变化规律。结果表明：不同高温空冷条件下(室温～200℃),DP800钢的组织均为铁素体和分布在其晶界上的岛状马氏体，随着服役温度的升高和时间的增加，其力学性能得到明显改善；高温水冷对DP800钢的微观组织和力学性能影响显著，随着服役温度的不断升高，两种保温时间下DP800钢的微观组织均经历了“马氏体铁素体化(300～700℃)→铁素体+马氏体双相组织(700～900℃)”的变化规律，其抗拉强度和屈服强度均呈现出“不断下降(300～700℃)→持续增大(700～850℃)→再次下降(850～900℃)”的变化规律。采用非线性回归法，构建了服役时间不超过60 min时高温水冷条件下DP800钢的抗拉强度、屈服强度随服役温度变化的经验预测模型，最大预测误差仅为7.88%,该模型可为高温服役后DP800钢力学性能变化评价提供理论参考。

关键词(KeyWords)： 双相高强钢;DP800;高温服役;力学性能;微观组织

Abstract:

Keywords:

基金项目(Foundation): 安徽省教育厅科学研究重点项目(2022AH051630,KJ2021A0862)

作者(Author): 缑瑞宾,徐浩,于敏,师泽宇,石文可

DOI: 10.13289/j.issn.1009-6264.2023-0443

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