And the low-temperature fracture was mainly quasicleavage step, this demonstrated that the fracture mede was transgranular type fracture.
低温拉伸时呈穿晶断裂，断口主要为准解理台阶；
It was found that the room-temperature fracture of the under-aged 3j21 alloy was of a dimple, while the low-temperature fracture assumed a mixed rupture feature.
结果表明：欠时效态3 J 21合金的室温断口为韧窝断口，而低温断口呈现混合断裂特征。
Structural Steels tend to brittle fracture at low temperature and with high thickness.
随着温度的降低和厚度增加，钢材的脆性增加。
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