Effect of Temperature-Force Factors and Concentrator Shape on Impact Fracture Mechanisms of 17Mn1Si Steel

Table 5

Fracture micromechanisms in the crack initiation zone for specimens with different-shaped concentrators.

Test temperature	Notch shape
	V	U	I
	Ductile fracture with macrodimples of size 40–80 μm	Ductile fracture with macro- and microdimples	Ductile fracture with macrodimples of size ~40 μm
	Ductile fracture with macro- and microdimples	Ductile-brittle delaminations	Facet fracture, ductile-brittle fracture
	Brittle fracture with river-like fracture pattern	Ductile-brittle fracture with facets + microdimples	Brittle fracture with partial local microscopically ductile ridges