Issue 14

inte of enr phy in shr eut It com Sev crit of acc crit this for sol Dif pro mo use hav wh al. sec [20 of b Th pou me bee ins sign elec ana dis cor a c M A Al fro ma at 7 cas Th cho 18 T rnal state of the mould. ichments at sical (fusion the last stage inkage comp ectic in Al-C is very diffic plexity of b eral authors ical paramete deformation umulation in ical paramete approach. mulated a cri id skeleton, w ferent exper duce interna uld test” is t s a simple eq e many varia ere the equip [19] for the tion. The tes ,21] and is th ars of differ e aim of this ring temper ans of the sa n used in or pection has b ificative zon tron micros lysis softwar tribution of relation betw omplete crac TERIALS AN loys and castin he comm copper alloys ar m Alloy B fo de based on 80 ± 5°C an ting, the melt e two differe sen; for each castings. stresses and Moreover, t both macros point) and c s of solidific ensation by u alloys incre ult to perfo oth the mec have tried to rs. For exam of a semi-sol which the m r is not the s Clyne and D terion based hich is depe imental tests l stresses in he most freq uipment and tions with re ment is desig study of alum t used for th e one carried ent length pr research is a atures on th nd mould ca der to verify een perform es of the c copy (SEM) e have been the eutectic p een the micr k caused by t D EXPERIM g system ercial EN A and silicon to e reported in r an increas its low castab d the chemi was accurat nt pouring te alloy and ea strains, and, here is the copic and m hemical (corr ation is very liquid feedin ases as the co rm a mathe hanical beha understand ple, Novikov id body at low ost importan train but the avies paid on afterfeed ndent on the have been the casting uently used t experiment gard to the ned to creat inium alloys e study of c out by Rose oduced from preliminary e hot tearing sting techniq its ability to ed on the cas astings for m . The micro statistically p hase. Finally ostructure an he hot tearin ENTAL PR B-21100 all the master Tab. 1. Allo e in silicon c ility and hot cal compositi ely degassed i mperatures ch pouring t M. Me secondly, the tendency of icroscopic le osion resista important, g and the po ncentration matical mod viour of the the possible and Novik strain rates t factor is th strain rate, w more attenti ing (RDG cr permeability developed f by restricting o compare t ing [13-17]. V geometry of e an abrupt s , involved th opper alloys nberg et al. [ one single p study on the behaviour o ue. The Cou also predict tings to dete etallographi graphs acqui rocessed to , all data ha d the tenden g phenomeno OCEDURE oy (Alloy A) alloy, have b y B differs f ontent from tearing susce on has been n order to gu of 760°C and emperature, rlin, Frattura ed re is the pre alloying el vels [6]. Seg nce) behavio because a g ssibility of of copper inc el that can semi-solid p causes of ho [8,9] reported , while Pellin e total strain it h Prokhoro on to the ti iterion) that of the mush or assessing the free co he hot tearin arious other the mould . W ection chang e realisation that was per 22], who des ouring. effect of dif f the EN A ture-Edward the hot tear ct surface cra c analysis, ca red by optic obtain a qua ve been coll cy of the san n. and two oth een selected rom Alloy A 0.2wt.% to ptibility. The analysed by arantee high 700°C, con three experim Integrità Struttu sence of diff ements and regations de ur of the allo reater amoun crack healing rease s [7]. reproduce t hase and the t tearing and that the grai i [10] suggest in the hot sp v [1,11] bein me spent in considered b y zone. hot tearing ntraction of g tendency o tests refer t ang et al. [1 e in the cast of a casting formed by C igned a moul ferent additio B-21100 allo s pattern, w ing behaviou cks and then rried out by al microscop ntitative eva ected and pl d mould cas er variants (A for this inve for a coppe 0.9wt.%. Th metal has be means of op molten quali trolled by m ental casting rale, 14 (2010) erent solidific impurities t termine a no y. The amou t of eutectic . It has been he hot tearin liquid flow have propos n boundary s ed a hot tear ot region. Som g the first to the mushy oth the fluid susceptibility the alloy du f aluminium o the so-calle 8] d eveloped ing, while the with six fan- outure and E d for the rea ns of coppe y. Several ca ell-suited for r of alumini several spec optical mic y and previ luation of th otted in orde tings, realised lloy B and stigation; the r content of e choice of E en melted in tical emission ty. eans of K-ty s have been 64-74; DOI: 10 ation rates in o segregate, n-homogene nt of eutecti increases th shown that g phenome in the interd ed models ba liding is the ing theory ba e authors su propose a cr state [12]. R flow and de , with the a ring solidific alloys becau d “dog bon a test for m test propos shaped bars dwards is o lisation of ca r and silicon stings have copper alloy um alloys. A imens have b roscopy (OM ously elabor e percentage r to underst with the ex Alloy C), ob average com 6wt.%, whil N AB-2110 an electric in spectroscop pe thermoco realised for a .3221/IGF-ESIS. different zo thus produ ous mechan c liquid avail e probability the quantity non due to endritic regi sed on diffe main mechan sed on the st ggested that iterion based appaz et al. formation of im to artific ation. The “ se this techni e tests” and agnesium al ed by Vojtec with a triang f greater inte stings compo and of diffe been realised s [20,21,23], liquid penet een drawn f ) and scann ated with im , mean area and the poss amined alloys tained by add positions of e Alloy C dif 0 alloy has b duction furn y (OES). Be uples, have b total numbe 14.07 65 nes cing ical, able of of the ons. rent ism rain the on [3] the ially ring que they loys h et ular rest sed rent by has rant rom ing age and ible , to ing the fers een ace fore een r of