Ua rau muaj qhov tsis xws luag hauv titanium raj vuam
Oxidation thiab paug: Titanium yog rhiab heev rau oxygen thiab yooj yim reacts nrog oxygen ntawm qhov kub thiab txias los tsim oxides. Thaum lub sij hawm vuam txheej txheem, yog tias tsis muaj kev tiv thaiv tsim nyog, cov pa oxygen hauv huab cua tuaj yeem ua rau titanium nto oxidize thiab tsim cov oxide zaj duab xis, yog li cuam tshuam rau vuam zoo. Tsis tas li ntawd, qhov chaw vuam tej zaum yuav kis kab mob, piv txwv li, vim muaj impurities hauv cov khoom siv vuam lossis ib puag ncig.
Kub gradient: Titanium muaj thermal conductivity thiab yuav tsim ib tug loj kub gradient thaum vuam. Kub gradients tuaj yeem ua rau muaj kev ntxhov siab ntau ntxiv thiab tsim cov thermal tawg, tshwj xeeb tshaj yog nyob rau hauv cov chaw txias txias.
Hydrogen Capture: Titanium yog ib yam khoom uas yooj yim absorbs hydrogen. Thaum lub sij hawm vuam, yog tias hydrogen absorbed rau hauv titanium, nws yuav ua rau hydrogen embrittlement los ntawm hydrogen capture. Hydrogen embrittlement tuaj yeem ua rau tsim cov kab nrib pleb.
Cov qauv kev hloov pauv: Titanium yog qhov yooj yim rau kev loj hlob ntawm cov qoob loo thiab cov qauv kev hloov pauv ntawm qhov kub thiab txias. Qhov no tuaj yeem ua rau txo qis zog hauv thaj chaw weld, cuam tshuam rau kev ua haujlwm vuam tag nrho.
Residual stress: Residual stress generated thaum lub vuam txheej txheem yuav ua rau deformation thiab tawg ntawm titanium raj. Qhov no tej zaum yuav tshwm sim los ntawm kev ua kom txias sai, sib txawv thermal expansion coefficients ntawm cov ntaub ntawv, thiab tsis zoo li shrinkage thaum vuam.
Cov vuam tsis xws luag ntawm titanium raj yog tshwm sim los ntawm argon roj tiv thaiv txheej tsim los ntawm argon arc vuam phom thaum vuam ntawm titanium raj. Cov cheeb tsam ib puag ncig tsis muaj kev tiv thaiv, tab sis cov titanium yeeb nkab weld thiab nws cov cheeb tsam ib puag ncig hauv lub xeev no tseem muaj peev xwm nqus nitrogen thiab oxygen hauv huab cua. Oxygen pib absorbed ntawm 400 degree, thiab nitrogen pib absorbed ntawm 600 degree. Cov huab cua muaj ntau cov nitrogen thiab oxygen.
Raws li qib ntawm oxidation maj mam nce, cov xim ntawm titanium yeeb nkab weld hloov thiab plasticity ntawm cov weld txo. Silvery dawb (tsis oxidized) Golden daj (TiO, titanium pib nqus hydrogen nyob ib ncig ntawm 250 degree . Me ntsis oxidized) Xiav (Ti2O3 me ntsis oxidized) Grey (TiO2 hnyav oxidized).
Lub uniformity ntawm cov tshuaj muaj pes tsawg leeg ntawm titanium alloy ingots yog qhov yooj yim lav rau kev ntseeg siab ntawm cov ntaub ntawv tiav thiab titanium alloy txiav qhov chaw nrog kev ua tau zoo.
Raws li cov titanium alloys uas twb muaj lawm muaj kev txhawj xeeb, cov ntsiab lus tseem ceeb yog Al, Mo, Sn, Si, Zr, Cr, Cu, V, thiab Fe. Nws yog ib qho tsim nyog yuav tsum nkag siab thiab paub txog cov cai ntawm kev faib tawm ntawm cov ntsiab lus alloy nyob rau hauv lub ingot nyob rau hauv lub tshuab nqus tsev consumable arc melting thiab crystallization tej yam kev mob, thiab ua raws li cov txheej txheem tsim nyog los xyuas kom meej lawv uniform tis nyob rau hauv lub ingot.
Kev ntsuam xyuas Anatomical tau ua rau tsib hom titanium: Ti-6Al-4V, Ti-2.5Cu, Ti-6.5Al-3.5Mo{{8 }}.5Sn-0.3Si, Ti-2.5Al-11Sn-5Zr-1Mo-0.25Si and Ti{{19 }}.5 Al-2.5Mo-1.5Cr-0.5Fe-6.3Si alloy ingot, tshawb xyuas qhov kev faib tawm ntawm cov ntsiab lus alloy nyob rau hauv cov xwm txheej sib txawv, thiab tshawb xyuas cov Kev sib cais thiab tshem tawm txoj kev ntawm aluminium alloy element Cu.
Lub titanium raj alloy ntsiab tau muab faib ua ob peb ntu thiab ntxiv rau titanium daim txhuam cev thaum nias lub tsev electrode thaiv. Consumable electrodes nrog ib tug kab pheeb ces kaum ntawm 450 mm yog welded los ntawm internal unit electrode blocks. Cov khoom siv hluav taws xob tau raug smelted ib zaug thiab rov ua dua ob zaug hauv lub tshuab nqus tsev siv hluav taws xob siv hluav taws xob, thiab peb qhov kev ntsuam xyuas tau ua tiav. Raws li cov qauv siv lead ua cov yam ntxwv ntawm lub tshuab nqus tsev siv hluav taws xob arc rauv steel ingots, ib qho hlau ingot pwm tau raug txiav tawm. Txiav txiav. Nyob rau sab saum toj ntawm qhov profile, laum qhov txhua 30-50 hli hauv txoj kab uas hla nrog φ1.5 hli laum me ntsis txhawm rau txheeb xyuas cov ntsiab lus siab tshaj plaws ntawm cov hlau alloy. Lub tshuab nqus tsev (1 × 10 ^ (-3) mmHg) thiab argon filling (siab 80-120 mmHg) melting, siab thiab qis melting zog, thiab kev sib piv cov kev ntsuam xyuas ntawm φ220 mm thiab φ622 mm ingots tau ua ntawm Ti{ {10}}.5Cu alloy.
Txhawm rau txo qhov tshwm sim ntawm cov teeb meem no, qee qhov kev ntsuas yuav tsum tau ua, xws li siv cov roj inert rau kev tiv thaiv thaum lub sij hawm vuam, tswj cov vuam ceev thiab kub gradient, preheating lub workpiece kom txo qhov kub ntawm gradient, siv cov khoom siv vuam tsim nyog. , txais yuav cov txheej txheem vuam tsim nyog, thiab lwm yam. . Tsis tas li ntawd, kev tswj hwm nruj ntawm cov ntsiab lus hydrogen thaum vuam thiab kev kho cua sov tsim nyog tom qab vuam kuj tseem yog ib qho tseem ceeb uas yuav txo tau qhov tsis xws luag.
