Kulul duuban waxay la mid tahay shuruudaha qabow-duuban, qabow-duuban ayaa ku jira heerkulka recrystallization ee ka hooseeya duubista, duubista kululna waxaa lagu fuliyaa meel ka sarraysa heerkulka recrystallization.

Faa'iidooyinka:

giringiriyey kulul dhaawici kartaa microstructure kabka ee birta ingot, sifaynta ee miraha crystal ee birta ah, iyo baabi'inta cilladaha microstructure ah, si ururka birta compacting, hagaajinta guryaha farsamo.Hagaajintani waxay ka muuqataa jihada rogrogmi karta, si birta aysan u sii ahaan ilaa xad isotropic;shubista samaynta goobooyin, dildilaacyo, iyo lafo-jileec, heerkulka sare iyo cadaadiska ayaa sidoo kale la isku dhejin karaa.

Khasaaraha:
1 Wareegga kulul ka dib, ku darida aan birta ahayn ee gudaha birta (inta badan sulfide iyo oxides, iyo sidoo kale silicate) ayaa lagu riixay xaashi, ifafaale stratified (laminated) ayaa soo muuqda.Lakabitaanka birta ee jihada dhumucda waxqabadka jiidista ayaa si weyn u xumaatay, waxaana laga yaabaa inay ka muuqato jeexjeexa alxanka jeexjeexa.Yaraynta alxanka ee ay keento culayska deegaanka ayaa inta badan gaara dhawr jeer culayska dhibcaha dhalid, culaysku aad ayuu uga weyn yahay culayska keenay;
2 Walwalka haraaga ah ee ay keento qaboojinta aan sinnayn.Cadaadiska haraaga ah waa cadaadiska isku dheelitirnaanta is-wajiga gudaha ee maqnaanshaha xoogga dibadda, birta kulul ee kulul ee qaybaha kala duwan ee isku-tallaabta ayaa leh culeys haraaga ah sida Caadi ahaan cabbirka qaybta birta ayaa weyn, way sii weynaataa cadaadiska haraaga.Cadaadiska hadhaaga ahi waa dheellitirka is-wajiga, laakiin xubnaha birta ee ku jira awoodda dibadda ama waxay leeyihiin saameyn gaar ah.Sida qallafsanaan, xasillooni, ka-hortagga daalka ayaa laga yaabaa inay si xun u xun tahay.
3 Badeecooyin bir ah oo kulul, xakamaynta liidata ee dhumucda iyo ballaca cidhifka.Waxaan ognahay balaadhinta kulaylka iyo foosha, xitaa haddii bilawga kululaynta kululaynta ay yihiin dhererka caadiga ah, dhumucda, ama waxaa jiri doona qaar ka mid ah finalka taban ka dib marka la qaboojiyo, tan geesaha kala duwan ee taban ee ballaaran ayaa sii kordhaya dhumucda sii kordheysa ee waxqabadka sii cad.Markaa birta waaweyn ee ballaca cidhifka birta, dhumucda, dhererka, xagasha iyo dhinaceeda sharci uma baahna si sax ah.Birta guud ee birta lagu duubo ee kulul, tuubooyinka kuleyliyaha cadaadiska hooseeya iyo kuwa dhexe, tuubooyinka kuleyliyaha cadaadiska sare, tuubooyinka birta, tuubooyinka birta ah, tuubada dildilaaca saliidda, tuubooyinka birta juqraafiyeed iyo tuubooyinka kale ee birta ah.