通过对具有15 MnVN钢模拟焊接过热区组织的光滑、缺口及预置裂纹试样的试验,以及利用光学和电子显微镜对组织、裂纹源等的观察,明确了这类组织的解理是由M-A组元形成的裂纹核引发的,并由此提出这类组织解理断裂的模型,推导出了三种试样的解理断裂统计判据.这判据将材料的断裂韧性与其它力学性能如屈服强度、硬化指数以及累积断裂概率P的关系定量地表达出来,并可以预测从下平台到过渡温度区间的断裂韧度与温度的关系,预测值与实验值相符.
Three kinds of simulated HAZ specimens of 15MnVN steel were tested. Based on metallographic and SEM examinations on fractured specimens, it has been clarified that the cleavage fracture initiates at the crack nuclei formed in M-A constituents. A statistical criterion of cleavage fracture for the specimens has been derived. It describes quantitatively the relationship among K_(IC)(or J_(IC)), σ_y, the hardening exponent, n, and the cumulative fracture probability, P, and the relationship between J_(IC) and T, by which the predicted values are in good agreement with the experimental results.
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| [11] | Ritchie, R. O. |
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