Fatigue Crack Paths 2003

b)

a)

d)

c)

Figure 1. Illustration of the material microstructure (a,c) of group 1 (numbers 1-8)

and (b,d) of group 2 (numbers 9-12) specimens.

The specimens’ fragments with fatigue surfaces were investigated into the scanning

electronic microscopes, types CDS-50with resolution not less than 0.005 ìm and J S M

35 facility with more little resolution.

Below are presented the results of the performed investigations of fatigue fracture

surfaces for all twelve specimens in accordance with the above-stated purposes.