1.Lub hom phiaj ntawm txias dov yog dab tsi?
Txias dov yuav tsum tau muab cov hlau rau khaus yas deformation ntawm chav tsev kub. Qhov no ua rau cov hlau sab hauv cov nplej kom elongate thiab tawg, ua kom muaj ntau yam tsis xws luag (lattice defects) thiab lattice distortions.
Cov dislocations ua entangled thiab cuam tshuam ib leeg lub zog, ua rau ntxiv deformation nyuaj. Macroscopically, qhov no manifests li hardness thiab zog, tab sis txo plasticity thiab toughness - txheej txheem hu ua "ua hauj lwm hardening."
2.Lub hom phiaj ntawm annealing yog dab tsi?
Annealing muaj cua sov txias- dov hardened steel mus rau ib tug tshwj xeeb kub (feem ntau saum toj no lub recrystallization kub, xws li 600-700 degree), tuav nws ntawm qhov kub ntawm lub sij hawm, thiab ces maj mam txias nws.
Thaum lub sijhawm ua haujlwm no, atoms tau txais lub zog txaus rau kev ua haujlwm, ua rau peb theem tseem ceeb:
Rov qab: Qee qhov kev ntxhov siab sab hauv tau txo qis, thiab cov khoom rov qab me ntsis.
Recrystallization: Qhov no yog kauj ruam tseem ceeb tshaj plaws. Tshiab, undistorted, zoo equiaxed nplej yog generated nyob rau hauv lub deformed qauv, maj engulfing lub qub, tawg deformed nplej.
Kev loj hlob ntawm cov qoob loo: Nrog lub sijhawm tuav ntev, cov nplej tshiab tuaj yeem ua ke thiab loj hlob.
3.Dab tsi yog lub hom phiaj tseem ceeb ntawm annealing hauv txias-rolled coil ntau lawm?
Tshem tawm kev ua hauj lwm hardening: Restoring cov ntaub ntawv plasticity, ua kom nws mus rau tom ntej, ntau txoj kev tsim xws li sib sib zog nqus nqus thiab ncab (tseem ceeb rau ntau yam automotive tha xim sab hauv, xws li complex rooj tog).
Txhim kho microstructure: Tau txais cov khoom sib xws, cov nplej zoo, txhim kho cov khoom siv tag nrho cov khoom siv thiab ruaj khov.
Kho cov khoom siv kho tshuab: Los ntawm kev tswj qhov kub thiab txias, lub sij hawm, thiab qhov txias txias, ntau yam khoom muaj zog sib txawv -plasticity ua ke tuaj yeem ua kom tau raws li ntau yam kev siv (xws li qib kos duab sib sib zog nqus, qib stamping, thiab lwm yam).
4.Dab tsi yog qhov tseem ceeb ntawm qhov no rau kev tsim cov tsheb sab hauv?
Ua ntej stamping: Yog hais tias ib feem muaj ib tug complex duab thiab yuav tsum tau sib sib zog nqus nqus los yog ntau stampings, ces siv annealed "mos" txias- dov daim ntawv yog tsim nyog; txwv tsis pub, cov khoom yuav tawg.
Cov khoom kawg: Rau cov khoom siv uas tsis tas yuav muaj zog heev, lub xeev annealed muab kev sib xyaw ua ke zoo ntawm lub zog thiab ductility. Rau cov khoom uas xav tau lub zog siab, cov ntaub ntawv uas tsuas yog ib feem ntawm cov annealed (xws li hauv lub xeev "semi- nyuaj") lossis tom qab ntxiv dag zog los ntawm lwm txoj kev tuaj yeem raug xaiv.
5.Dab tsi yog cov kev phiv thiab kev tiv thaiv ntawm annealing?
Nto Oxidation thiab Decarburization:
Thaum annealed nyob rau hauv huab cua, hlau oxide nplai (oxide nplai) cov ntaub ntawv nyob rau saum npoo ntawm cov hlau ntawv, thiab cov pa roj carbon ntsiab lus yuav poob (decarburization), ua rau ib tug softened nto thiab txo lub zog.
Kev ntsuas kev lag luam: Kev lag luam, kev tiv thaiv huab cua annealing (xws li nitrogen- hydrogen sib tov) lossis cov kab txuas txuas ntxiv (CAL) feem ntau yog siv, nqa tawm hauv cov pa oxygen-dawb ib puag ncig kom ntseeg tau qhov ci, huv si tsis muaj oxide nplai.
Annealing Adhesion Risk:
Thaum lub sij hawm siab -kub annealing ntawm steel coils, yog hais tias lub coiling yog nruj heev los yog lub interlayer siab dhau heev lawm, nyob ib sab coils yuav undergo microscopic diffusion thiab ua ke.
Countermeasures: Tswj cov txheej txheem annealing tsis thiab maj mam cais cov coils siv cov khoom xws li "txoj kev ncaj thiab descaling" thaum lub sij hawm uncoiling.