热疲劳断口具有穿晶解理特征。
拉伸试样表面充氢层的断口是穿晶解理断口。
Transgranular cleavage fracture is shown for the charged layer in tensile specimen.
低温拉伸时呈穿晶断裂，断口主要为准解理台阶；
And the low-temperature fracture was mainly quasicleavage step, this demonstrated that the fracture mede was transgranular type fracture.
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