Crack Paths 2009

90

7801.1

1 0.9 0.8 0.7 0.6 0.5

(a)

34560

( ) Colonies

Lamellae

(

)

Di/Do

90

-2 1

246810

3456780

h ()mm) Di/Do

(b)

'

0

1.1

1 0.9 0.8 0.7 0.6 0.5

M od

( º )

e I len

( ) º

ng le

x (mm)

234

c r a c k a

gt h,

I

h (mm)

s tep

M a c r o s c o p ic

(c)

h eig

-1357910

º

-011

ht

( m m

)

1.1

1 0.9 0.8 0.7 0.6 0.5

Di/Do

Figure 5. Relationship between the microstructure of the steels and the crack paths: (a)

evolution with cold drawing of the orientation angles of colonies and lamellae in the

pearlitic microstructure; (b) evolution with cold drawing of the macroscopic crack angle

and step height in H A Cconditions; (c) evolution with cold drawing of the macroscopic

crack angle, step height and modeI propagation distance in L A Dconditions; the angles

, ' and are measured from the radial direction (transverse to the wire axis).

1103