1.Dab tsi yog qhov tseem ceeb takeaways?
** Stamping/Drawing Qib (piv txwv li, SPCC/DC01):**
Ntau yam: Feem ntau ntawm 0.65 thiab 0.80.
Cov yam ntxwv: muaj zog sib npaug, nruab nrab formability. Haum rau cov khoom siv nrog cov kev xav tau tsawg formability.
** Stamping/Drawing Qib (piv txwv li, SPCD/SPCE, DC03/DC04, 08Al):**
Ntev: 0.50 txog 0.70; siab- zoo sib sib zog nqus nqus hlau tuaj yeem tswj tau ntawm 0.55 txog 0.65 lossis qis dua.
Yam ntxwv: Ib qho piv txwv qis zog feem ntau qhia tau tias zoo dua formability thiab ntau dua plasticity cia. Haum rau tsheb lub cev panels, complex sib sib zog nqus-kos qhov chaw, thiab lwm yam.
**High-Strength Steels (piv txwv li, Siab-Strength Low-Alloy Steel - HSLA, Duplex Steel - DP):**
Ntau yam: 0.55 txog 0.85+, ntau yam.
Cov yam ntxwv: Cov hlau no txhim kho lub zog los ntawm cov txheej txheem sib txawv (kev daws teeb meem, kev hloov pauv theem, thiab lwm yam). Piv txwv li, duplex steel (DP) muaj qhov tsis tshua muaj zog ntawm qhov sib piv (kwv yees 0.50-0.65) thiab muaj peev xwm ua haujlwm siab, ua rau nws zoo tagnrho rau cov khoom siv hauv tsheb uas xav tau ob qho tib si siab zog thiab zoo formability.
2.Dab tsi yog qhov tseem ceeb cuam tshuam rau qhov kev tawm dag zog lub zog piv?
Txheej txheem Annealing (Qhov tseem ceeb tshaj):
Recrystallization Annealing: Tom qab txias dov, ua kom tiav recrystallization annealing yields equiaxed ferrite nplej, txo cov yield zog piv thiab nce elongation. Qhov no yog cov txheej txheem tseem ceeb kom tau txais cov txiaj ntsig qis zog sib sib zog nqus - kos duab hlau.
Annealing Kub thiab Lub Sijhawm: cuam tshuam cov qoob loo loj. Feem ntau, cov nplej ntxhib tsim nyog tau txais txiaj ntsig zoo rau kev txo qis qhov sib piv ntawm lub zog (Hall-Page kev sib raug zoo).
Tshuaj muaj pes tsawg leeg:
Cov pa roj carbon tsawg, tsis muaj impurities: Cov no yog qhov tseem ceeb kom tau txais lub zog qis zog. Sib sib zog nqus- kos duab hlau yuav tsum tau tswj nruj heev ntawm cov ntsiab lus xws li C, N, S, thiab P.
Microalloying: Ntxiv cov khoom xws li Al, Nb, thiab Ti tuaj yeem kho C thiab N, purify ferrite, tswj cov qoob loo loj, thiab ua kom zoo dua.
Txias Rolling Reduction:
Ua ntej annealing, tus nqi ntawm txias dov deformation txiav txim siab khaws cia deformation zog, cuam tshuam rau cov qauv nplej thiab kev ntxhib los mos tom qab recrystallization, yog li cuam tshuam qhov kawg yield zog piv thiab plasticity.
Microstructure:
Cov qauv ferrite ntshiab thiab zoo nkauj zoo nkauj (xws li - fiber ntau kev ntxhib los mos) yog qhov txiav txim siab kom tau txais cov yas siab thiab cov khoom muaj zog tsawg. Ib qho nyuaj thib ob theem (xws li pearlite lossis carbides) yuav ua rau kom muaj zog ntawm qhov sib piv.
3.Dab tsi yog qhov tseem ceeb ntawm engineering ntawm qhov kev tawm dag zog lub zog piv?
Tsawg yield zog piv (<0.65):
Qhov zoo: Cov formability zoo heev, tsis tshua muaj kev tawg thaum lub sij hawm stamping, muaj kev cuam tshuam zoo, thiab siab ruaj khov ntawm qhov chaw (lub caij nplooj ntoo hlav yog qhov yooj yim los tswj).
Daim ntaub ntawv: Automotive lub cev vaj huam sib luag (qhov rooj, fenders), txoj kev sib sib zog nqus- kos qhov chaw, cov khoom siv uas yuav tsum tau muaj kev nyab xeeb zoo.
High yield strength ratio (>0.75):
Qhov zoo: Cov khoom siv nce mus txog nws lub zog siab tshaj plaws sai sai tom qab yielding, ua rau muaj kev siv zog siab thiab muaj peev xwm tsawg dua cov khoom siv kom ncav cuag lub zog tsim.
Disadvantages: tsis zoo formability, me me yas cia, kuj muaj kev pheej hmoo ntawm kev tsis ua hauj lwm tam sim ntawd, thiab loj springback.
Daim Ntawv Thov: Cov qauv tsim nrog cov qauv tsim qis, qhov yooj yim dabtsi yog khoov, thiab qee yam thauj khoom -cov kabmob.
4.Muab piv txwv tias lub zog tawm los yog li cas.
SPCC (Kev Siv Dav Dav): Tawm lub zog feem ntau 140-280 MPa, tensile zog 270-410 MPa, yield zog piv kwv yees li ntawm 0.65-0.80.
DC04 (Drawing sib sib zog nqus): Tawm lub zog feem ntau Tsawg dua lossis sib npaug ntawm 210 MPa, tensile zog 270-350 MPa, yield zog piv kwv yees Tsawg dua lossis sib npaug li 0.65, cov khoom zoo tuaj yeem ncav cuag qis dua 0.60.
5.Yuav ua li cas yog qhov sib piv ntawm lub zog ntawm txias- dov coils, qhov taw qhia tseem ceeb rau kev ntsuas nws cov formability thiab lub zog siv efficiency, cuam tshuam?
Rau cov ntawv thov uas yuav tsum tau ua kom zoo tshaj plaws (xws li sib sib zog nqus- kos cov khoom siv tsheb), sib sib zog nqus- kos cov ntawv qib steel uas tau dhau los ua kom txaus recrystallization annealing yuav tsum raug xaiv, nrog rau qhov sib piv ntawm lub zog tsawg li tsawg tau (lub hom phiaj 0.55-0.65).
Rau cov ntawv thov tseem ceeb ntawm lub zog thiab lub teeb yuag, siab - lub zog steel yuav raug xaiv. Nyob rau hauv cov ntaub ntawv no, lub yield zog piv yuav ntau dua, yuav tsum muaj ib tug sib npaug ntawm formability thiab lub zog.