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首页> 外文期刊>ISIJ international >Fracture Mechanism of Ferritic Ductile Iron under Instrumented Impact Load at Low Temperatures
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Fracture Mechanism of Ferritic Ductile Iron under Instrumented Impact Load at Low Temperatures

机译：低温冲击载荷下铁素体球铁的断裂机理

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The impact toughness of 400-18L ductile iron (FCD400-18L) was measured by V-notch Charpy impact test at room and low temperatures. SEM and TEM were used to analyze the fracture mechanism. Experimental results show that the energy absorbed by impact test decreases significantly with the decrease of temperature. The fracture properties were measured using instrumented impact testing at temperatures between –80 and 20°C. The total impact fracture energy, the crack initiation and propagation energy, the dynamic loads and the ductile to brittle temperature were measured. The 400-18L ductile iron exhibited much higher resistance to ductile fracture at high test temperatures, while its resistance to brittle fracture at low test temperatures was reduced. The fracture morphology analysis was discussed in terms of the two fracture types: ductile fracture mechanism upon the BDTT (brittle to ductile transition temperature) and brittle fracture mechanism below the BDTT.
机译：通过V型缺口夏比冲击试验在室温和低温下测量400-18L球墨铸铁（FCD400-18L）的冲击韧性。用SEM和TEM分析了断裂机理。实验结果表明，冲击试验吸收的能量随着温度的降低而明显降低。断裂性能是在–80至20°C的温度下使用仪器化冲击试验测量的。测量了总冲击断裂能，裂纹萌生和扩展能，动态载荷以及韧性至脆性温度。 400-18L球墨铸铁在高测试温度下表现出更高的抗延性断裂性能，而在低测试温度下的抗脆性断裂性能降低。根据两种断裂类型讨论了断裂形态分析：BDTT上的韧性断裂机理（脆性至韧性转变温度）和BDTT以下的脆性断裂机理。

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