于晓飞,曹晓恩,薛仁杰,赵林林,刘鹏

• 1:河钢集团邯钢公司技术中心
• 2:武汉科技大学材料与冶金学院
• 3:河钢集团河钢材料技术研究院

摘要(Abstract)：

采用热膨胀-显微组织-显微硬度相结合的方法，绘制了1.0 GPa级冷轧增强成形性双相钢的静态连续冷却转变曲线(CCT曲线),并研究了退火工艺对实验钢显微组织与力学性能的影响。结果表明：实验钢过冷奥氏体冷却转变过程主要存在铁素体相变区、贝氏体相变区和马氏体相变区的3个相变区；当冷速低于1℃/s时，实验钢主要发生铁素体与贝氏体相变，并存在少量马氏体相变；当冷速在3～20℃/s之间时，发生马氏体与贝氏体相变；当冷速达到30℃/s及以上时，完全发生马氏体转变。随冷却速率的增加实验钢的显微硬度逐渐增大，前期显微硬度提升较快，冷速达到20℃/s后逐渐趋于平稳，与对应冷速下的显微组织一致。实验钢的组织主要为铁素体、马氏体和残留奥氏体，三者匹配有利于变形过程基体强塑性的提升。当均热温度为810℃时，实验钢中残留奥氏体含量最高，为4.9%,变形过程中相变诱导塑性(TRIP)效应显著，力学性能最佳，屈服强度为791.7 MPa、抗拉强度为1041.7 MPa、伸长率为19.37%、强塑积达到20.18 GPa·%。

关键词(KeyWords)： 增强成形性双相钢;静态CCT;残留奥氏体;TRIP效应

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 于晓飞,曹晓恩,薛仁杰,赵林林,刘鹏

DOI: 10.13289/j.issn.1009-6264.2022-0234

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