Mechanism of Microscopic Fracture of Typical Shell Steel under Impact Loading

Table 4

Fracture mode in the observation areas of 12 target plates.

Target plate	Crack			Target plate	Crack
	1	2	3		1	2	3
A-I	Intergranular fracture	Intergranular fracture	Intergranular fracture	A-III	Cleavage fracture	Cleavage fracture	Trans-granular fracture
B-I	Trans-granular fracture	Trans-granular fracture		B-III	Trans-granular fracture	Intergranular fracture
C-I	Ductile fracture	Trans-granular fracture		C-III	Trans-granular fracture
A-II	Intergranular fracture	Intergranular fracture		A-IV	Trans-granular fracture	Cleavage fracture
B-II	Trans-granular fracture	Trans-granular fracture		B-IV	Trans-granular fracture	Trans-granular fracture
C-II	Ductile fracture			C-IV	Ductile fracture