Ua ntej, lub microstructure thiab cov khoom ntawm titanium alloy forgings yog rhiab heev rau forging thermal tsis. Lub forging kub ntau ntawm titanium alloy yog qhov nqaim. Thaum lub sij hawm forging txheej txheem, raws li tus deformation tus nqi nce, nws deformation kuj nce ho, qhia muaj zog strain tus nqi rhiab heev.
Thib ob, titanium alloy muaj cov thermal conductivity tsis zoo thiab muaj kev cuam tshuam rau hauv zos overheating thaum lub sij hawm forging txheej txheem, ua rau ib tug loj sab hauv thiab sab nraud kub sib txawv, exacerbating lub uneven faib ntawm sab hauv thiab sab nraud deformation ntawm lub billet, ua rau tawg thaum lub sij hawm forging txheej txheem, thiab nyob rau hauv qhov mob hnyav, ua rau cov khoom pov tseg.
Yog li ntawd, nws yog ib qho tseem ceeb ntawm kev tsim khoom tseem ceeb los kawm txog qhov cuam tshuam ntawm cov txheej txheem forging sib txawv ntawm cov qauv thiab cov khoom siv ntawm titanium alloys txhawm rau nrhiav cov txheej txheem forging tsim nyog los tsim titanium alloy forgings.
TC4 titanium alloy raw khoom siv nyob rau hauv qhov kev sim yog ib tug forging billet nrog ib tug loj ntawm Φ100mm × 450mm. Qhov (+) / theem hloov pauv taw tes (T) ntsuas los ntawm txoj kev metallographic yog 990 degree.
Txhawm rau kawm txog kev cuam tshuam ntawm cov txheej txheem forging ntawm microstructure thiab mechanical zog ntawm TC4 titanium alloy, forging billet tau muab faib ua peb ntu, thiab cov qauv forging (T -60 degree), ze- forging (T {{ 3}} degree) thiab forging tau ua raws. (T +40 } degree) cov txheej txheem kuaj, qhov deformation yog 50%. Cov khoom siv forging yog 3t dawb forging rauj. Tom qab forging, forgings tau los ntawm peb cov txheej txheem tau raug kev kho cua sov dual ntawm 900 degree × 1h / AC+600 degree × 4h / AC. Tom qab kev kho cua sov, cov qauv metallographic, cov qauv tensile thiab cov qauv cuam tshuam tau raug coj los ntawm TC4 titanium alloy forgings, thiab lawv cov microstructures raug soj ntsuam nyob rau hauv lub tshuab ntsuas metallographic. Cov duab tsom xam software tau siv los ua kom tiav cov txheeb cais ntawm microstructural tsis xws li equiaxed theem cov ntsiab lus thiab theem nrab lamellar theem thickness. Cov txiaj ntsig tau pom tias:
(1) Tom qab TC4 titanium alloy yog forged los ntawm peb txheej txheem: + forging, ze- forging thiab forging, nws tau txais cov qauv equiaxed, cov qauv sib xyaw thiab cov qauv lamellar feem.
(2) Lub zog ntawm TC4 titanium alloy tuav tom qab + forging, ze- forging thiab forging yog sib npaug, thaum lub plasticity ntawm + forging thiab ze- forging yog siab tshaj qhov forging, tab sis TC4 titanium alloy tuav tom qab forging muaj kev cuam tshuam zoo tshaj plaws. tawv. TC4 titanium alloy bar qhia tau hais tias qhov zoo tshaj plaws kev siv tshuab ua haujlwm tom qab ze-beta forging.
(3) Cov pob txha tawg ntawm cov qauv tensile ntawm TC4 titanium alloy tuav nyob rau hauv peb txheej txheem forging tag nrho qhia txog kev puas tsuaj ntawm lub cev. + forging thiab ze-forging muaj qhov sib sib zog nqus thiab sib sib zog nqus dimples, thaum tom qab forging Cov alloy nthuav tawm flatter thiab elongated dimples.
