侯晓英,孙卫华,曹光明,展英姿,金光宇,任东

• 1:山东钢铁集团日照有限公司

摘要(Abstract)：

采用光学显微镜、扫描电镜、透射电镜和拉伸试验等研究了一种TRIP型双相钢经不同退火工艺处理后的显微组织形貌特征及力学性能,并分析了其强塑性机制。结果表明:实验钢的微观组织由约(57～58)%铁素体、(30～34)%马氏体及≥8.0%残留奥氏体组成,三相组织的协调变形机制,有利于实验钢的强度、塑性和扩孔性能的提升。在795℃退火处理有利于实验钢中残留奥氏体的稳定保留,体积分数达到12.4%,其相变产生的增强增塑效应,在强化基体的同时,还可抑制由于应力集中导致的局部软化,延迟颈缩的发生。此外,晶粒细化(98.863%的晶粒尺寸<3.0μm)和大角度晶界比例增加(61.2%),均有效加速"位错墙"的形成,可同步提高实验钢的强度、塑性和扩孔性能,其中抗拉强度达到1095 MPa,伸长率为15.0%,扩孔率λ为55%。

关键词(KeyWords)： TRIP型双相钢;形貌特征;强塑性机制;残留奥氏体

Abstract:

Keywords:

基金项目(Foundation): 山东省重点研发计划(重大科技创新工程)(2019TSLH0103)

作者(Author): 侯晓英,孙卫华,曹光明,展英姿,金光宇,任东

DOI: 10.13289/j.issn.1009-6264.2021-0018

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