本文就氮化层对断裂的影响,提出一物理模型.氮化层的影响可视为母材强化和残余内应力二因子作用的线性叠加,用线弹性断裂力学的方法,给出氮化材料断裂韧性和阈值的定量表达式.
A method for clarifying the effect of nitrided case on the fracture of anodular cast iron has been proposed. Assuming that the effect of the nitrided caseis a linear superimposure of the strengthening of matrix in the case and theresidual stress, quantitative expressions of the fracture toughness as well as thethreshold of fracture toughness are achieved. Results obtained from the nodularcast iron appear to be in reasonable agreement with the experimental data.
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