Vim li cas qee qhov tooj liab castings yuav tsum tau annealed?
Tom qab cov tooj liab qhov chaw yog annealed thiab txias, ib tug niaj hnub, nyias, pob tshab thiab tsis-peeling zaj duab xis yuav ua rau ntawm hlau nto, ua rau tooj liab thiab tooj liab alloys muaj zoo anti-discoloration thiab anti-oxidation muaj peev xwm. Nws yog dav siv nyob rau hauv lub tes tsho tooj liab thiab tooj liab alloy industries, xws li cov txheej txheem annealing ntawm cov ntaub ntawv tooj liab, tooj liab nyob ntawm tej, tooj liab-clad txhuas, tooj liab-clad steel, liab qab tooj liab ca hlau, thiab electromagnetic nyob ntawm tej.
Ib qho ntawm cov txheej txheem tseem ceeb tshaj plaws ntawm annealing yog qhov siab tshaj plaws cua sov kub (annealing kub). Kev xaiv ntawm annealing cua sov kub rau feem ntau alloys yog raws li cov theem daim duab ntawm lub alloy system. Lub annealing kub ntawm ntau yam tooj liab alloys yog ib tug tej yam kub saum Ac3, saum toj no Ac1 los yog qis dua Ac1 ntawm txhua hom tooj liab, nyob ntawm seb lub hom phiaj tshwj xeeb annealing. Lub annealing kub ntawm ntau yam uas tsis yog-ferrous alloys yog kub hauv qab lub solidus kub ntawm lub alloy thiab saum toj no los yog qis dua cov khoom solubility kab kub.
Recrystallization annealing yog siv rau cov alloys qhov twg solid-state theem transformation (recrystallization) tshwm sim thaum lub sij hawm equilibrium cua sov thiab txias. Lub annealing kub yog kub saum toj no los yog nyob rau hauv lub theem transformation kub ntau yam ntawm txhua alloy. Cua sov thiab txias yog ob qho tib si qeeb. Cov hlau tau dhau los ua ib theem kev hloov pauv thiab recrystallization thaum lub sijhawm cua sov thiab cua txias, yog li nws yog hu ua recrystallization annealing, feem ntau hu ua annealing.
Homogenization annealing tseem hu ua diffusion annealing. Ib txoj kev annealing siv rau ingots los yog castings ntawm hlau thiab non-ferrous alloys (xws li tin bronze, silicon bronze, aluminium bronze, dawb tooj liab, magnesium alloys, thiab lwm yam). Lub ingot los yog casting yog rhuab mus rau ib tug ntau dua kub nyob rau hauv lub solidus kub ntawm lub alloy, cia sov rau ib ntev lub sij hawm, thiab maj mam txias. Homogenization annealing yog ua kom muaj zog-xeev diffusion ntawm cov ntsiab lus hauv cov hlau kom txo cov tshuaj muaj pes tsawg leeg inhomogeneity (segregation), feem ntau kom txo cov tshuaj muaj pes tsawg leeg inhomogeneity nyob rau hauv lub grain loj (intra-granular segregation los yog dendrite segregation). Yog vim li cas vim li cas homogenization annealing kub yog siab heev yog kom ceev lub diffusion ntawm alloy ntsiab thiab shorten lub sij hawm tuav kom ntau li ntau tau. Lub homogenization annealing kub ntawm tooj liab castings yog ntau dua li Ac3, feem ntau yog 1050 ~ 1200 degree . Qhov kub rau homogenization annealing ntawm non-ferrous alloy ingots yog feem ntau "0.95 × Solidus kub (K)". Vim lub cua sov kub thiab lub sij hawm tuav ntev, homogenization annealing siv cov hluav taws kub loj.
Tom qab cov khoom siv tooj liab yog annealed thiab txias, ib qho zoo, nyias, pob tshab, tsis-tev zaj duab xis tuaj yeem ua rau ntawm cov hlau nto, ua rau tooj liab thiab tooj liab alloys muaj peev xwm los tiv thaiv tsis zoo thiab tiv thaiv oxidation. Nws yog dav siv nyob rau hauv lub tes tsho tooj liab thiab tooj liab alloy industries, xws li cov txheej txheem annealing ntawm cov ntaub ntawv tooj liab, tooj liab nyob ntawm tej, tooj liab-clad txhuas, tooj liab-clad steel, liab qab tooj liab ca hlau, thiab electromagnetic nyob ntawm tej.
