Dangantaka tsakanin saurin walda da ingancin walda

Dangantakar da ke tsakanin saurin walda da ingancin walda ya kamata a fahimci yare kuma kada a yi watsi da su. Yafi bayyana a cikin dumama mataki da crystallization mataki.

Matakin dumama: A ƙarƙashin yanayin madaidaicin bututu mai ɗorewa, gefen bututun bututu yana mai zafi daga zafin daki zuwa zafin walda. A cikin wannan lokacin, gefen bututun da ba shi da kariya ba shi da kariya kuma gaba daya ya fallasa shi zuwa iska, wanda ba makawa ya yi mummuna tare da iskar oxygen, nitrogen, da dai sauransu a cikin iska, yana haifar da karuwa mai yawa a cikin nitrogen da oxides a cikin suturar weld. Dangane da ma'auni, abun ciki na nitrogen a cikin kabu na weld yana ƙaruwa da sau 20-45, kuma abun cikin oxygen yana ƙaruwa da sau 7-35; Hakazalika, abubuwan da ake haɗawa da su kamar manganese da carbon da ke da amfani ga ɗinkin walda suna ƙonewa sosai kuma suna ƙafewa, wanda hakan ke haifar da raguwar kayan aikin walda. Daga nan, za a iya ganin cewa ta wannan ma'ana, saurin walda yana raguwa, mafi muni da ingancin kabu.

Haka kuma, tsawon lokacin da gefen billet ɗin mai zafi yana fallasa iska, saurin walda yana raguwa, wanda zai iya haifar da samuwar oxides maras ƙarfe a cikin yadudduka masu zurfi. Wadannan zurfafa zaune ba karfe oxides da wuya gaba daya matsi daga cikin weld kabu a lokacin m extrusion crystallization tsari, da kuma zama a cikin weld kabu a cikin nau'i na wadanda ba karfe inclusions bayan crystallization, forming a fili m dubawa cewa halakar da ci gaba da tsarin kabu na weld kuma yana rage ƙarfin kabu. Kuma saurin waldawa yana da sauri, lokacin iskar iskar shaka shi ne gajere, kuma abubuwan da ba na ƙarfe ba da aka samar suna da ƙanƙanta kuma iyakance ga saman saman. Yana da sauƙi a matse shi daga cikin kabu na walda yayin aiwatar da extrusion na gaba, kuma ba za a sami ragowar oxide da ba na ƙarfe ba da yawa a cikin kabu ɗin walda, wanda zai haifar da ƙarfin walƙiya.

Matsayin Crystallization: Dangane da ka'idodin ƙarfe, don samun ƙarfin ƙarfi mai ƙarfi, ya zama dole don tsaftace tsarin ƙwayar ƙwayar ƙwayar ƙwayar cuta kamar yadda zai yiwu; Babban tsarin gyarawa shine samar da isassun ƙwayoyin kristal a cikin ɗan gajeren lokaci, ta yadda za su yi hulɗa da juna kafin girma da kuma kawo karshen tsarin crystallization. Wannan yana buƙatar ƙara saurin walda don cire walda da sauri daga yankin dumama, don ba da damar walda don yin crystallize cikin sauri a wani mataki mafi girma na rashin sanyi; Lokacin da digiri na undercooling ya karu, ƙwayar nucleation zai iya karuwa sosai, yayin da girman girma ya karu kadan, don haka cimma burin tace girman hatsi na kabu na weld. Don haka, idan aka kalli yanayin dumama aikin walda ko kuma sanyaya bayan walda, saurin walda da sauri, mafi kyawun kabu ɗin walda, in dai an cika ainihin yanayin walda.