Kev txhim kho ntawm Microstructure thiab Properties ntawm TC4 Titanium Alloy los ntawm Annealing
Titanium thiab nws cov alloys yog dav siv nyob rau hauv aerospace, tsheb, tshuaj, thiab marine industries vim lawv zoo xws li tsis tshua muaj ceev, siab tshwj xeeb zog, thiab zoo heev corrosion kuj.TC 4titanium alloy muaj 6% ntawm -theem stabilizing lub caij Al thiab 4% ntawm -theem stabilizing element V, uas yog ib txwm + dual-theem cua sov- zog titanium alloy ntawm Ti-Al-V system. Nws muaj cov khoom siv zoo thiab cov txheej txheem ua tau zoo, thiab tuaj yeem ua tiav rau hauv ib nrab- cov khoom tiav xws li tuav, profiles, nplooj ntawv, thiab forgings, uas tau nyiam los ntawm tib neeg.
Tam sim no, kev tshawb fawb hauv tsev feem ntau tsom mus rau qhov siab - qhov kub thiab txias, cov khoom nkag, thiab thermal stability ntawm TC4 titanium alloy, tab sis tseem muaj kev tshawb fawb me me ntawm kev ua kom zoo dua nws cov kev ua tau zoo los ntawm cov txheej txheem kho cua sov tsim nyog. Daim ntawv no kawm txog kev cuam tshuam ntawm cov txheej txheem kho cua sov ntawm microstructure thiab mechanical zog ntawm cov khoom los ntawm TC4 titanium alloy nplooj ntawv rau cov txheej txheem kev kho cua sov sib txawv, uas muaj qhov tseem ceeb theoretical thiab cov tswv yim tseem ceeb.
Ua ntej, titanium daim txhuam cev, siab -purity aluminium (99.99%), thiab aluminium-vanadium alloy tau yaj hauv dej nqus tsev-copper crucible uas tsis yog-consumable arc rauv nyob rau hauv electromagnetic stirring thiab argon tiv thaiv. Cov alloy muaj pes tsawg leeg tom qab melting (los ntawm pawg pawg, %) yog: 6.29Al, 4.14V, 0.029Fe, 0.023C, 0.19O, nrog rau qhov seem yog Ti. Txhawm rau kom ntseeg tau qhov sib xws ntawm cov tshuaj muaj pes tsawg leeg ntawm cov qauv, TC4 titanium alloy tuav tau npaj los ntawm triple remelting thiab dov rau hauv cov ntawv titanium nrog lub thickness ntawm 3 hli, ua raws li kev ntxhov siab -relief annealing ntawm 650℃rau 4 teev. Tom qab ntawd, cov nplooj ntawv annealed tau ua tiav rau hauv cov qauv kev soj ntsuam microstructure thiab cov qauv ntsuas tensile, thiab raug rau peb txoj kev kho cua sov hauv qab no:
1. Annealing kev kho mob: 790℃× 3 teev, cua sov cua sov.
2. Kev daws quenching: 980℃× 1 teev, dej txias.
3. Kev daws teeb meem kev laus: 980℃× 1 teev, dej txias + 580℃× 8 teev, rauv cua txias.
Cov qauv tom qab kev kho cua sov yog tag nrho cov kev soj ntsuam microstructure thiab tensile khoom kuaj.
Kev cuam tshuam ntawm kev kho cua sov ntawm Microstructure thiab cov khoom ntawm TC4 Titanium Alloy
1. Kev kho mob annealing
Tom qab annealing, recrystallization tshwm sim nyob rau hauv ob theem ntawm cov khoom. Recrystallization ntawm -theem tshwm sim, nrog polygonal me nplej precipitating nyob rau hauv lub deformed matrix; recrystallized -theem precipitates theem nrab -phase. Qhov kawg microstructure nthuav tawm ib qho -theem uniformly faib rau ntawm matrix ntawm -theem transformation, nrog rau tag nrho cov uniform microstructure. Annealing tshem tawm cov kev ntxhov siab sab hauv, txhim kho plasticity thiab microstructural stability, tab sis ua rau txo qis zog thiab hardness.
2. Tshuaj quenching
Tom qab kev daws quenching, qhov sib piv ntawm -lamellae txo qis, ncaj -lamellae ua twisted, thiab txuas ntxiv -theem interface raug rhuav tshem, tsim lamellar lossis pob tawb-weave -theem. Vim yog qhov txias txias los ntawm qhov siab - cheeb tsam kub, qhov -theem tsis muaj sijhawm txaus los hloov pauv mus rau -theem, ua rau muaj kev tsim cov metastable -theem. Nyob rau hauv chav tsev kub, lub microstructure mas muaj martensitic '' thiab metastable -theem, uas qhia tau hais tias muaj zog thiab hardness, tab sis ib tug tseem ceeb txo nyob rau hauv ductility.
3. daws kev laus
Tom qab kev daws kev laus, qee qhov ntawm martensitic '' thiab metastable -theem decompose, hloov mus rau hauv ruaj khov dispersed -theem thiab -theem. Piv nrog rau annealing, lub zog thiab hardness yog ntxiv txhim kho tom qab laus, tab sis cov ductility txo me ntsis. Los ntawm kev tsom xam, kev daws teeb meem kev laus txhim kho cov khoom zoo ntawm titanium alloy.
Xaus
Kev tshawb fawb ntawm TC4 titanium alloy nplooj ntawv los ntawm kev kho cua sov sib txawv qhia tau hais tias:
● Annealing kev kho mob tuaj yeem txhim kho plasticity thiab microstructural stability, tab sis txo lub zog thiab hardness.
● Cov tshuaj quenching ho txhim kho lub zog thiab hardness, tab sis txo ductility considerably.
● Kev daws kev laus, rau qee qhov, sib npaug cov kev xav tau rau lub zog, hardness, thiab ductility, txhim kho cov khoom zoo ntawm cov khoom.
Tsim nyog xaiv cov txheej txheem kho cua sov yog qhov tseem ceeb rau kev ua kom zoo ntawm cov khoom siv hluav taws xob ntawm TC4 titanium alloy, muab kev txhawb nqa rau nws daim ntawv thov hauv siab - kev ua tau zoo xws li aerospace.
