Superplastic txoj kev ua thiab kev thov ntawm titanium alloy
Titanium alloy muaj qhov zoo ntawm kev qaug zog tsis kam, siab zog tshwj xeeb, kev txhim kho corrosion thiab siab kub tsis kam, qee yam cim lub cim xeeb kev ua haujlwm, superior txhua yam khoom, lub zog tshuaj ruaj khov, thiab lwm yam, thiab tau siv ntau dua thiab dav hauv aerospace, tshuaj lom neeg thiab tshuaj lom neeg. liaj teb. Txawm li cas los xij, cov titanium alloys kuj muaj qhov tsis xws li cov hluav taws xob tsis tshua muaj zog, loj txias deformation tsis kam, siab tshaj tawm cov zis, tsis tshua muaj yas, muaj qhov thim rov qab, thiab tsis ua haujlwm txias txias, uas ua rau nws yooj yim los tsim hluav taws xob rov qab thiab anisotropic tso tom qab ua. Yog li no, cov kws tshaj lij thiab cov kws tshaj lij tuaj ntawm ntau lub teb chaws tau ntxiv dag zog rau kev tshawb fawb ntawm cov txheej txheem superplasticity ntawm cov alloys titanium. Qhov hu ua superplasticity yog hais txog qhov tshwm sim uas cov khoom tso tawm qhov tsis txaus ntseeg rheological tsis meej thiab lub zog rheological tsis meej nyob rau hauv qee yam xwm txheej sab hauv thiab sab nraud.
1. Superplastic taus cov txheej txheem ntawm titanium alloy
1.1 Tej yam kev mob rau kev ua ntau yam ntawm titanium alloy
(1) Qhov ntsuas kub: qhov kub hloov kho tas mus li. Qhov kub ntawm cov alloys titanium sib txawv yog qhov sib txawv, tab sis kwv yees ntau yam yog nruab nrab ntawm 700 ~ 1000 ℃. Piv txwv, qhov ntsuas kub ntawm Ti-6AL-4V yog 850 ° C.
(2) Tus nqi pes tsawg: Hlau nrog superplasticity feem ntau muaj kev ua si qeeb qeeb. Qhov no yog vim nws siv sijhawm txaus rau atoms rau diffuse. Piv txwv, txoj haujlwm nruj ntawm Ti-6AL-4V yog 1.3 × 10-4 ~ 10-3 s-1.
(3) Ultra-nplua cov qauv lis: Nws yog qhov yuav tsum muaj kom muaj cov qia zoo, zoo nkauj qauv, xws li lub lis piam loj ntawm titanium alloys tsawg dua 3 hli.
Cov xwm txheej saum toj no, tsuas yog tias cov qauv hauv cov lis thiab txiav txim siab thiab raug pov hwm los ntawm cov khoom siv ntawm cov khoom siv raw, qhov kub thiab raug mob siab tuaj yeem lav tau los ntawm cov txheej txheem superplastic cov khoom thiab cov txheej txheem.
1.2 tuag rau kev ua superplastic ntawm titanium alloy
Vim tias qhov kub ntawm superplastic sib sau ntawm titanium alloy feem ntau ntawm 700 ° C thiab 1000 ° C, muaj cov cai tshwj xeeb rau cov khoom ntawm cov khoom mould, xws li siab dua kub zog, zoo thermal stability, qis thermal expansion coefficient, thiab qis nqe khoom. , Kev ua thiab tsim khoom, thiab lwm yam Tam sim no, muaj feem ntau ntawm cov hlau alloys tiv thaiv thaum tshav kub kub, cov cua kub tsis muaj zog, cov khoom siv ceramics thiab carbon fiber ntxiv tiv thaiv pwm. Piv txwv li, cov pa roj carbon fiber ntau ntxiv cov khoom siv pwm muaj yuav luag zoo ib yam deformation tsis kam thaum kub thiab ntsuas kub txog 1000 ℃, thiab cov pa roj carbon fiber ntau ntxiv cov khoom siv pwm tsuas yog 1% ntawm qhov hnyav ntawm qhov kub-resistant steel pwm; thaum cov pa roj carbon fiber ntau ntxiv cov khoom siv pwm ua kom txias, nws cov deformation tsis sib haum Cov shrinkage tsawg dua li ntawm qhov tsim, uas ua rau kom tawg ntawm feem; mould ua cov khoom siv ntawm cov pa roj carbon fiber ntau dua ua ke cov pwm kev pheej yig.
1.3 Titanium alloy superplastic txoj kev ua cov txheej txheem
(1) Cov cua kub ua kom sov siab: Titanium alloy superplastic forming feem ntau siv txoj hauv kev ua cua sov hauv cov pwm rauv, uas yog, pwm muab tso rau hauv qhov cub ua kom sov thiab ua kom sov ntawm qhov kub kom txog thaum nws muab rhaub rau qhov kub ntawm qhov superplastic forming, thiab tom qab ntawd titanium alloy cov khoom siv raw tau muab tso rau hauv cov pwm. Thaum tshav kub kub ua kom sov ua tiav cov ntsiab lus ntawm titanium alloy raw cov ntaub ntawv rau lub superplastic forming kub.
(2) Sealing: Vim tias titanium alloy superplastic forming yog huab cua siab tsim, cov pwm thiab titanium alloy raw cov ntaub ntawv yuav tsum muab ntim cia.
(3) nqus plua plav: Txhawm rau kom ntseeg tau zoo ntawm titanium alloy qhov chaw thiab tiv thaiv titanium alloy cov khoom siv raw, cov kab noj hniav yuav tsum nqus.
(4) Txhuam tiv thaiv txheej txheej: Vim tias titanium alloy superplastic forming qhov kub yog qhov siab heev, txhawm rau tiv thaiv nws cov oxidation thiab hydrogen nqus, nws yog qhov tsim nyog los txhuam ib txheej txheej tiv thaiv nyob rau sab saum npoo ntawm titanium alloy raw khoom kom ua si lub lub luag haujlwm ntawm kev tiv thaiv txheej txheem. Tseem muaj qee qhov tshwj xeeb tshwj xeeb rau kev tiv thaiv pleev xim. Piv txwv li, nws yuav tsum muaj peev xwm tsim cov zaj duab xis tiv thaiv tuab, thiab muaj qhov kub zoo tiv thaiv, thermal stability thiab lubricity. Nws yuav tsum tsis ua qias tuaj pwm thiab titanium alloy qhov chaw, thiab tus nqi yuav tsum pheej yig. Nws yog ib qho yooj yim txhuam thiab ntxuav. Cov duab graphite dej thiab cov xim kub ua kom sov yog siv feem ntau.
(5) Inflation: Vim hais tias cov superplastic tsim ntawm titanium alloy yog huab cua siab tsim, ib qho siab ntawm cov roj inert yuav tsum tau nias rau hauv cov pwm (thiaj li tiv thaiv cov titanium alloy los ntawm oxidizing thiab nqus hydrogen ntawm qhov kub siab), thiab qhov nce nqi tus nqi yuav tsum qeeb.
