č ka obrada metala Termi č - Predavanje –
TERMI Č ČKA OBRADA Č ELIKA
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Termička obrada je obrada je tehnološki proces koji se sastoji iz zagrevanja metala do odredjene temperature, zadržavanja na toj temperaturi i hladjenja do sobne temperature
Progrevanje
Progrevanje a r u t a r e p m e T
e j n a v r e g Z a
a r e u j t n a a r v e p r e g m a e Z T
H l a d j e n j e
H la d je n je
Zagrevanje Vreme
Vreme
Zamrzavanje
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Vrste termičke obrade čelika U postupke obične termičke obrade spadaju: Žarenje (difuziono, normalizaciono, meko, potpuno,
rekristalizaciono, za otklanjanje napona); Kaljenje (zapreminsko ili potpuno, površinsko); Otpuštanje
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Žarenje čelika Žarenje je vid termi čke obrade u toku koje se čelični delovi zagrevaju do odredjenih povišenih temperatura, drže izvesno vreme na tim temperaturama i zatim lagano hlade. Time se postiže uspostavljanje strukturne ravnoteže koja je poreme ćena nekim prethodnim postupkom termičke ili mehaničke obrade. Posle žarenja se dobija perlitno-feritna, perlitna, ili il i perlitno-cementitna struktura (zavisno od sastava čelika).
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Metodi žarenja dele se na postupke sa faznim promenama: promenama: difuzno, normalizaciono, meko i potpuno žarenje
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Ž ž
Zasniva se na zagrevanju čelika (visoko u austenitnom područ ju), nešto ispod solidus linije, dugotrajnom progrevanju na toj temperaturi i sporom hladjenju. Primenjuje se radi: smanjenja nejednorodnost hemijskog sastava kod čeličnih odlivaka, poboljšanja mikrostrukture koja umesto neujedna čene (dendritne) postaje homogena. a r u t a r e p m e T
1200
1100
1000 C
Austenit
1050 - 1200°C 10 - 40 h
V h = 5 0 - 1
A C3
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ž
Izvodi se zagrevanjem čelika ili čeličnog liva do temperature oko 30 do 50°C iznad gornje kritične temperature A 3 za podeutektoidne, odnosno iznad A Cm za nadeutektoidne čelike, zatim progrevanjem pri toj temperaturi i najzad hladjenjem na mirnom vazduhu. Cilj normalizacije je da se dobije ravnomerna i sitnozrnasta struktura.
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ž
Izvodi se zagrevanjem oko donje kriti čne temperature (A1), zadržavanjem nekoliko desetina sati na toj temperaturi i zatim se delovi sporo hlade do sobne temperature. Kao rezultat ove obrade dobija se struktura mekšeg-zrnastog (globularnog) cementita, umesto lamelarnog koji je tvrdji. Primenjuje se radi poboljšanja obradljivosti rezanjem, naro čito otkovaka od visokougljeničnih i legiranih čelika. elika. Pri obradi rezanje rezanjem m lamelarnog lamelarnog perlita, perlita, nož seče
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ž Zasniva se na zagrevanju čelika do austenitnog područ ja (30-50°C iznad ta čke AC3 ACm), zatim zadržavanju na odabranoj temperaturi i veoma sporom hladjenju u pe ći u intervalu faznih promena (A 3, ACm,- A1). Dalje hladjenje od A 1 do sobne temperature može biti na vazduhu. Svrha potpunog žarenja žarenja jeste usitnjavanje zrna, otklanjanje nepovoljne Vidmanšetenove Vidmanšetenove strukture, ujednačavanje strukture, kao i otklanjanje sopstvenih napona, tako da čelik postane mekši i kovniji.
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ž
Deo se zagreva 30-50°C iznad gornje kriti čne temperature A C3, zatim brzo hladi do temperature nešto iznad 550ºC, zadržava pri toj temperaturi do završetka perlitne promene i najzad hladi na vazduhu. Izotermalno žarenje ima prednost u odnosu na potpuno žarenje jer obezbeđuje skraćeno vreme procesa i dobijanje jednorodnije strukture.
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Ž ž
Zasniva se na zagrevanju metala, prethodno plastično deformisanog na hladno, do temperature više od temperature rekristalizacije, zadržavanju na toj temperaturi i hladjenju proizvoljnom brzinom. Temperatura rekristalizacije rekristalizacije (Tr) metala i legura zavisi pre svega od njihove temperature topljenja (Tt, K). Za tehnički čiste metale, ona približno iznosi T ≈ 0.4 ⋅ T , a za legure tipa r
t
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Ž
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Kaljenje čelika
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Indukciono površinsko kaljenje
Pri indukcionom zagrevanju se na površini komada generiše struja (I k ) iste frekvencije ali suprotnog smera od struje koja proti če kroz induktor (I ind). Površinski slojevi se najpre zagrevaju sekundarnim strujama, a zatim se zakaljuju prskanjem vodom ili potapanjem u kadu. Za utvrdjivanje dubine prodiranja struje važi izraz: ρ 4 δ = 5.03 ⋅ 10
⋅
f ⋅ μ
,
mm
gde je: f – frekv frekvenc encija ija naizme naizmeni ni čne struje, ρ - specifični električni otpor i
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Indukciono kaljenje
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