Issue 14

M.

Merlin, Frattura

ed Integrità Str

utturale, 14 (20

10) 64-74; DOI

: 10.3221/IGF-ES

IS.14.07

Th of

e same correl each alloy; th ntity of eute ained from A ring temper cked bars ca istical proce rostructural at influence i flicting cons ative effect d interdendrit cessing of d lowest numb

ation betwee is relation fo ctic phase a lloy B and t ature and of used by the ssing of the analysis expl n the hot tea equences: a ue to the pr ic zones. D ata, from the er of compl

n the percen r Alloy A is vailable to h his is in good the copper developmen micrographs ained in secti ring behavio positive effe ecipitation o espite the r visual and t etely cracked

tage and mea depicted in F eal the hot agreement w content in t t of hot tear of the samp on Microstruc ur of the exa ct due to th f Al-Fe-Si pl esults obtain he liquid pen bars.

n area of the ig. 13. As ca tears is both ith the visua he alloy cont s. No furthe les drawn fr tural analysis ; mined alloy. e higher cas atelets that c ed by the m etrant inspec

eutectic pha n be seen, if greater and l and liquid p ribute to the r significant om the casti it seems that Perhaps, the tability of th an contribute etallographi tions (Tab.

se has been the pouring coarser. Th enetrant insp reduction o information ngs produce small silicon presence of e alloy than to limit the c analysis an 2) the casting

studied by se temperature e same tren ections. The f the numb has been ob d in Alloy C additions (0 silicon in allo Alloy A and flow of the d the subse s realised in

parating the is increased, d has also b increases of er of comple tained from , confirming .7wt.%) have y C has had Alloy B, an eutectic liqui quent statis Alloy C pre

data the een the tely the the no two d a d in tical sent

qua obt pou cra stat mic gre con neg the pro the

Figure 13

: Correlation b

etween percen

tage and mea

n area of the e

utectic phase i

n Alloy A.

Th par cou obt

e mean minim ameter relate ld be a usefu ained in un-c

um-radius o d to the pos l index for t racked bars,

f the eutectic sible concent he evaluation it seems that

phase calcu ration of str of the susc there was no

lated for both esses in the m eptibility to h significative

cracked and aterial; its lo ot tearing (F correlation r

un-cracked wer value in ig. 14). Mor elated to the

bars has been cracked bar eover, consid different len

considered s suggests th ering the res gth of the ba

as a at it ults rs.

Figure 14 :

Correlation be u

tween mean a n-cracked bars

rea and minim for castings p

um radius of t oured at 760°

he eutectic in C.

cracked and

72