Issue 14

M. Me ilable in the

rlin, Frattura ed last stages of

Integrità Struttu solidification

rale, 14 (2010) strongly co

64-74; DOI: 10 ntributes to t

.3221/IGF-ESIS.

14.07

the hot

effect of the tears.

greater eute

ctic liquid ava

he healing of

the

Figure 10 :

Fractured soli

d bridges in sa

mple A.2.2.3.

Figure 11 : Fr

actured solid b

ridges in sam

ple A.3.1.1.

Ima As stu mic pro dis dat com frac cas pou 760 in t dev com can am len effe eut Co

ge analysis mentioned i dy possible c rographs ha cessed by m tribution in t a have been position of tures; the in tings that is ring temper ectic phase, i mparing the °C, the crack he diagram o iation of 4.7 prehensive be seen fro ount of eutec gth of the ba ct in the last

n Materials an orrelations b ve been obta eans of ima erms of mean collected a the alloys. T crease in bot to the decrea ature: at an ndependently results obtain ed bars are f Fig. 12. Th 3%, while in of data obtai m the diagra tic phase tha rs seems to stages of sol

d experimenta etween mic ined by opt ge analysis s minimum-r nd correlate he correlatio h the percent se of the num equal eutecti of the lengt ed from the characterised e mean valu the un-crack ned from sam m, among t n the longes play an impo idification.

l procedure: Im rostructural p ical microsco oftware. Qu adius of the d with the ns suggest t age and the c ber of crac c percentage h of the bars samples dra by a smaller e of the perc ed bars it is ples drawn he un-cracke t ones (n°1 a rtant role in

age analysis , I arameters a py in the ho antitative inf eutectic phas pouring tem he importanc oarseness of ked bars. Mo , the casting and the alloy wn from cra percentage o entage of the 14.54% with from all the d bars the s nd n°2). Acc the eutectic

mage-Pro Pl nd the hot t t spot near ormation co e has been c perature, th e of the cap the eutectic reover, an in s poured at . cked and un f eutectic ph eutectic in t a standard d castings; this hortest bars ordingly, the liquid flow a

us software earing behav the spherica ncerning the arried out. U e cracked an ability of the phase contri teresting res the highest t -cracked bars ase than the he cracked b eviation of 5 justifies the (n°3 and n° geometrical nd, as a cons

has been use iour of the l feeder of a percentage, sing a statist d un-cracke eutectic liqu butes to the ult concerns emperature of all the ca un-cracked o ars is 11.65% .4%. The resu high standar 4) are charac effect related equence, in t

d to prelimin castings. Sev ll bars and t mean area ical approach d bars and id to heal o soundness of the effect of present a co stings poure nes, as depi with a stand lt is general d deviations terised by m to the diffe he crack hea

ary eral hen and , all the pen the the arse d at cted ard and . As ore rent ling

Figure 12 : E

utectic percen

tage in the sa

mples drawn f

rom cracked a

nd un-cracked

bars of all the

castings pour

ed at 760°C.

71