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本文研究了中碳结构钢(45Cr及60D)马氏体基体上存在不同数量、大小、形状及分布的铁素体对宏观综合机械性能的影响规律.试验结果表明:在马氏体基体上存在少量薄片状或细小分散状的铁素体时,其静强度、旋转弯曲疲劳强度仍保持在高强度水平下,而塑性与韧性特别是断裂韧性(K_(1c))却有较明显的提高. 本文通过对透射电子显微组织形态分析以及扫描电镜断口特征分析的基础上,初步讨论了马氏体基体中铁素体形态的微观韧化机制。
In this paper, the effects of different amounts, sizes, shapes and distributions of ferrite on the macroscopic mechanical properties of medium carbon structural steel (45Cr and 60D) martensite are investigated.The results show that the martensite matrix When a small amount of flake-like or finely dispersed ferrite is used, the static strength and bending fatigue strength remain at high strength level, while the plasticity and toughness, especially the fracture toughness (K 1c), are obviously improved. Based on the morphological analysis of transmission electron microscopy and the analysis of the fracture characteristics of the SEM, the microscopic toughening mechanism of ferrite morphology in martensite matrix was preliminarily discussed.