Crack Paths 2012

(a)

(b)

Figure 5: Crack path of a service crack in a base load blade; (a) overview with optical microcope, (b) S E Mmicrograph BSE

Figure 6: Zone of local remelting at crack face; SEM-BSEmicrograph BSE

Figure 7: BSEimage of crack tip showing zone without ’-precipitates

© 2012SiemensEnergy, Inc. All rights reserved.

1061