张慧勇,车马俊,杜晓洁,徐震霖,周霆伟,何宜柱

• 1:安徽工业大学材料科学与工程学院
• 2:南京钢铁股份有限公司
• 3:安徽工业大学材料与加工安徽省重点实验室

摘要(Abstract)：

为满足先进制造业对高强韧钢材的需求，结合控轧控冷(TMCP)和淬火回火(QT)工艺开发出一种具有超高强韧的贝氏体/马氏体复相钢，并对其显微组织、强韧性能与裂纹扩展机制进行了研究。结果表明：与TMCP工艺制备的粒状贝氏体钢(TMCP钢)相比，经TMCP+QT工艺制备的贝氏体/马氏体复相钢(QT钢)的组织呈现典型的板条状亚结构特征，其显微组织由宽度接近1μm或亚微米尺寸的板条贝氏体与板条马氏体构成，残留奥氏体以薄膜状分布于板条之间，这种多尺度结构协同作用使QT钢的性能显著提升，抗拉强度与断后伸长率分别提升了15.0%和80.4%,-40℃下的低温冲击吸收能量增至TMCP钢的2.3倍；贝氏体/马氏体复相组织的裂纹萌生能与粒状贝氏体的裂纹萌生能相近，但由于板条贝氏体/马氏体组织阻碍了冲击裂纹的扩展，迫使裂纹扩展方向频繁发生“Z”型偏转，导致QT钢的裂纹扩展能远大于TMCP钢，从而提高了冲击韧性。

关键词(KeyWords)： 超高强钢;贝氏体/马氏体复相组织;低温冲击韧性;裂纹扩展

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划(2016YFB0300600)

作者(Author): 张慧勇,车马俊,杜晓洁,徐震霖,周霆伟,何宜柱

DOI: 10.13289/j.issn.1009-6264.2025-0023

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