The cutting tool was characterized by intercrystalline fracture attributed to fatigue and partial cleavage fracture in the machining process.
Fractographic observations showed that hydrogen could induce surface cracks for smooth specimens and a cleavage fracture pattern for notch specimens at RT.
Moreover, to explain the cleavage fracture in ductile materials also needs the development of strain gradient theory.
The critical event for cleavage fracture in notched specimens is the propagation of a ferrite grain-sized crack into the matrix, and is independent of specimen sizes and widths.
The fractures of the alloys change from dimple to cleavage fracture with river pattern.
Dimensions of the stress and crystalline have influence on cleavage fracture.
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