Ígwè akpata oyi akwa - ADI nkedo

Austempered ductile iron, makwaara dị ka ADI, na-ezo aka na ductile nkedo ígwè mgbe usoro nke austenitizing ductile iron (850 ℃-950 ℃) wee tinye ya ngwa ngwa na a nnu bath (232℃-450℃) maka isothermal mgbanwe. Na mgbakwunye, na mgbakwunye na nke zuru oke nke Cu, Ni, Mo na ihe ndị ọzọ, austempered austenitic ductile iron nwekwara ike nweta n'okpuru ọnọdụ jụrụ oyi na-aga n'ihu.

Ígwè ductile na-ekpo ọkụihe nkedonwere magburu onwe n'ibu Njirimara, na ha unit arọ nke mkpụrụ ike kacha nta. Inweta ọkwa dị iche iche nke austempered ductile iron na-adabere na okpomọkụ nke austempering na enweghị ihe jikọrọ ya na ihe mejupụtara kemịkalụ. N'ikwu okwu n'ozuzu, ihe mejupụtara kemịkalụ nke iron austempered ductile dị n'ụdị ndị a:
C: 3.5-3.8%
Si: 2.4%-3.0%
Nna: 0.30%
P: <0.07%
S: <0.02%

Silicon bụ otu n'ime ihe kachasị mkpa nke ígwè ductile austempered. Silicon na-egbochi guzobe Bainite carbides, si otú ahụ na-enye aka n'ịmepụta acicular ferrite. Ịba ụba ọdịnaya silicon nwere ike ịbawanye mmetụta siri ike nke nkedo ductile na-ekpo ọkụ ma belata elongation. Ọrụ nke manganese nwere akụkụ abụọ. N'otu aka ahụ, ọ nwere ike imeziwanye ike siri ike; N'aka nke ọzọ, Manganese ga-akwalite nhazi nke carbide ma gbochie mgbanwe nke isothermal n'oge usoro siri ike. Ya mere, mgbe ọnụ ọgụgụ nke graphite spheres dị ala na mgbidi buru ibu, nkewa nke manganese na oke ọka ga-eme ka porosity shrinkage, carbides na austenite na-akwụghị ụgwọ na nkedo ígwè ductile. Nrụrụ microstructure ndị a na inhomogeneities ga-ebelata machinability na akụrụngwa akụrụngwa. Ya mere, a ga-achịkwa oke pasent nke manganese n'okpuru 3%.

Na mmepụta nkedo n'ezie, iji nweta ihe kwụsiri ike na nke dị elu nke austemperedihe nkedo ductile, e nwere isi ihe abụọ chọrọ nlebara anya pụrụ iche:
1) Jikwaa nhazi nke ihe nkedo ductile iron tupu ọgwụgwọ isothermal. Ọnụego spheroidization kwesịrị ịdị elu karịa 80%. Ọnụ ọgụgụ nke graphite kwesịrị ịbụ ihe karịrị 100 kwa milimita square. Ọnọdụ ndị ọzọ gụnyere: ihe mejupụtara kemịkalụ kwụsiri ike; ihe nkedo kwesịrị ịbụ nke enweghị isi nke carbides, porosity na inclusions; yana oke ọdịnaya pearlite/ferrite kwụsiri ike.
2) Kpebie nkọwa ọgwụgwọ okpomọkụ kwesịrị ekwesị dị ka ihe mejupụtara na ihe nkedo nke ígwè ductile si dị, ma mee usoro ọgwụgwọ okpomọkụ siri ike ma kwụsie ike.