褚豪杰,龚隆盛,豆尔康,李天瑞,杨永

• 1:安徽工业大学冶金工程学院

摘要(Abstract)：

利用光学显微镜(OM)、扫描电镜(SEM)和电子拉伸试验机等研究了S355钢在不同热处理状态下的微观组织及拉伸性能，并分析了其应变时效行为。结果表明：S355钢在不同热处理状态下的微观组织差异较大，热轧态、正火态、退火态均为多边形铁素体+珠光体组织，回火态为板条状马氏体+多边形铁素体组织；回火态试验钢的抗拉强度显著提升，但伸长率损失严重；正火态和退火态试验钢的拉伸曲线由时效前的“Round House”拱顶型连续屈服转变为带有明显屈服平台的曲线，而热轧态和回火态的拉伸曲线在时效前后均具有明显屈服平台，呈非连续屈服；S355钢的应变时效现象随着预应变量增加、时效时间增加以及时效温度升高而愈加明显，并且其屈服强度和抗拉强度随时效温度的升高呈现逐渐增大的趋势；回火态试验钢以屈服强度和屈强比为指标的时效敏感性最低。

关键词(KeyWords)： S355钢;应变时效敏感性;热处理状态;屈服平台

Abstract:

Keywords:

基金项目(Foundation): 中冶集团“181计划”项目;; 国家自然科学基金(52301028);; 安徽省自然科学基金(2108085QE214)

作者(Author): 褚豪杰,龚隆盛,豆尔康,李天瑞,杨永

DOI: 10.13289/j.issn.1009-6264.2024-0560

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