Crack Paths 2006

Figure6: SEMfracture surface analysis (R = ferritic, ferrito-pearlitic, pearlitic nd austempered ductile iron. Crack growth from left 0.5, ' K= 10 MPa¥m).Fromleft toright:

to right.

1246800

m ]

1 0 0 %F

5 0 %F + 5 0 %P

5 %F + 9 5 %P

ADI

0

20

40

60

80

100

Approximation sphere diameter "D" [Pm]

Figure 7: Four investigated ductile irons. Approximation sphere diameter – void

diameter.

123450

1 0 0 % F

5 0 % F + 5 0 % P

m ]

5 % F + 9 5 % P ADI

100

0

20

40

60

80

Approximation sphere diameter "D" [Pm]

Figure 8: Four investigated ductile irons. Approximation sphere diameter – void depth.