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本文介绍了用直流电位差法、柔度变化率法和Key—曲线分析法对等温淬火低合金球墨铸铁的静态和动态裂纹萌生阻力韧性(J_(IC),J_(Id))及裂纹扩展阻力韧性(J—△a曲线,T_(mat))进行的评价。肯定了柔度变化率法和Key—曲线分析法对评价这种铸铁的动态裂纹萌生阻力和裂纹扩展阻力韧性是有效的。并得出结论:QB′处理(先在γ相区短时间加热保温后进行油淬,然后在(α+γ)两相区加热保温进行等温淬火)和B′处理(在(α+γ)两相区加热保温后进行等温淬火)可以改善Mn、Ni低合金铸铁的裂纹萌生和裂纹扩展的阻力韧性。
In this paper, static and dynamic crack initiation toughness (J_ (IC), J_ (Id)) and crack propagation resistance of isothermal quenched low alloy ductile iron with direct current potential difference, softness rate of change and Key- Toughness (J - △ a curve, T mat) evaluation. It is confirmed that the rate of change of compliance and the method of Key-curve analysis are effective in evaluating the dynamic crack initiation resistance and the crack propagation resistance toughness of such cast iron. The results of QB ’treatment (first oil quenching after heat-holding in the γ-phase region and then isothermal quenching in the (α + γ) two-phase region) and B’ treatment The two-phase zone isothermal quenching after heat preservation) can improve the resistance toughness of crack initiation and crack propagation of Mn, Ni low alloy cast iron.