李敬,杨跃辉,张晓娟,苑少强

• 1:河北省智能装备数字化设计及过程仿真重点实验室
• 2:唐山学院

摘要(Abstract)：

测定了中碳25Mn钢经温轧及退火处理后的拉伸性能及-196℃时的低温韧性，并对不同处理条件下的显微组织及冲击断口进行了观察，讨论了试验钢退火过程中的再结晶行为及其对力学性能的影响机制。结果表明：试验钢在550℃保温1 h后已经基本完成再结晶，再提高退火温度，再结晶组织逐渐粗化，导致奥氏体的稳定性变差，因此在变形过程中更易于发生马氏体相变，即相变诱导塑性(TRIP)机制逐渐增强，这虽然能够在一定程度上缓解裂纹形核与扩展过程中产生的应力集中，但马氏体的产生也会导致钢的韧性与塑性恶化。同时，结果也表明即便再结晶已经充分，细小的奥氏体晶粒中仍然存在一定量的高密度位错胞和层错，因此产生了比单一细晶强化更高的强度增量。

关键词(KeyWords)： 高锰钢;温轧;再结晶;变形机制

Abstract:

Keywords:

基金项目(Foundation): 河北省自然科学基金(E2019105101)

作者(Author): 李敬,杨跃辉,张晓娟,苑少强

DOI: 10.13289/j.issn.1009-6264.2023-0226

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