Austempered ductile iron, eo hape e tsejoang e le ADI, e bua ka ductile cast iron after process of austenitizing ductile iron (850℃-950℃) ebe e e beha kapele ka bateng ea letsoai (232℃-450℃) bakeng sa phetoho ea isothermal. Ho phaella moo, ka ho eketsoa ha chelete e lekaneng ea Cu, Ni, Mo le likarolo tse ling, austempered austenitic ductile iron e ka boela ea fumanoa tlas'a maemo a pholileng a tsoelang pele.
Austempered ductile ironli-castingsli na le thepa e ntle ea mochini, 'me boima ba yuniti ea bona ea matla a lihlahisoa ke tse nyane ka ho fetisisa. Ho fumanoa ha limaraka tse fapaneng tsa tšepe ea austempered ductile ho itšetlehile ka mocheso oa mocheso 'me ha ho letho le amanang le motsoako oa lik'hemik'hale. Ka kakaretso, motsoako oa lik'hemik'hale oa tšepe ea austempered ductile o maemong a latelang:
C: 3.5% -3.8%
Boemo: 2.4%-3.0%
Mong: ＜0.30%
P: <0.07%
S: <0.02%
Silicon ke e 'ngoe ea likarolo tsa bohlokoa ka ho fetisisa tsa tšepe ea ductile ea austempered. Silicon e thibela ho thehoa ha Bainite carbides, kahoo e kenya letsoho ho thehoeng ha ferrite ea acicular. Ho eketsa dikahare tsa silicon ho ka eketsa matla a ts'ebetso ea tšepe e entsoeng ka ductile ea austempered le ho fokotsa bolelele. Karolo ea Manganese e na le mahlakore a mabeli. Ka lehlakoreng le leng, e ka ntlafatsa haholo ho thatafala; ka lehlakoreng le leng, Manganese e tla khothalletsa ho thehoa ha carbides le ho thibela phetoho ea isothermal nakong ea ts'ebetso ea ho tiisa. Ka hona, ha palo ea likarolo tsa graphite e le tlase 'me botenya ba lerako bo le boholo, ho arohana ha manganese moeling oa lijo-thollo ho tla baka shrinkage porosity, carbides le austenite e sa tsitsang ka ho lahla tšepe ea ductile. Mefokolo ena ea microstructure le inhomogeneity li tla fokotsa machinability le thepa ea mochini. Ka hona, peresente ea boima ba manganese e lokela ho laoloa ka tlase ho 3%.
Ka tlhahiso ea sebele ea ho lahla, e le hore u fumane mokhoa o tsitsitseng le oa boleng bo phahameng ba austemperedductile tšepe castings, ho na le lintlha tse peli tse hlokang tlhokomelo e khethehileng:
1) Laola sebopeho sa tšepe ea as-cast ductile pele ho kalafo ea isothermal. Sekhahla sa spheroidization se lokela ho ba holimo ho 80%. Palo ea graphite pheres e lokela ho ba ho feta 100 per square millimeter. Maemo a mang a kenyelletsa: sebopeho sa lik'hemik'hale se tsitsitseng; ho lahla ha hoa lokela ho ba le li-carbides, porosity le inclusions; le tekanyo e tsitsitseng ea pearlite/ferrite content.
2) Fumana lintlha tse nepahetseng tsa kalafo ea mocheso ho latela sebopeho le sebopeho sa tšepe ea ductile, 'me u etse ts'ebetso e tiileng le e tsitsitseng ea kalafo ea mocheso.
Nako ea poso: Apr-15-2021