Kev tshawb fawb ntawm High-Kev Ua Haujlwm Txias Txias Txheej Txheem ntawm TC4 Titanium Alloy Bars thiab Hlau
Daim ntawv no tsom rau cov txheej txheem kev kos duab txias ntawm TC4 titanium alloy tuav thiab cov xov hlau, tshawb xyuas cov txheej txheem ua ntej thiab tuag tsis nyob rau hauv daim ntawv sau. Los ntawm kev ua kom zoo dua cov txheej txheem kev kos duab txias, chav tsev kub txias txias ntawm TC4 titanium alloy tau ua tiav tiav.
Kev tsom xam thiab kev tsom xam microstructure ntawm TC4 billets uas tsim los ntawm cov duab kub tau qhia tias cov qauv nplej tau tawg thiab ua rau tsis tiav recrystallization tom qab kub kub. Cov nplej tau zoo thiab equiaxed, nrog indistinct rheological kev taw qhia, tsim kom muaj tej yam kev mob rau txias deformation. Cov pob txha tawg ntawm TC4 tom qab kub daim duab nthuav tawm cov yam ntxwv ntawm cov pob txha tawg, nrog ntau qhov pores tshwm rau hauv qab ntawm qhov dimples raws li qib ntawm deformation nce. Tom qab annealing ntawm 760℃rau 1 teev, lub billet pom zoo tag nrho cov kev ua tau zoo, thiab ib tug uniform thiab ntom lub teeb daj oxide zaj duab xis tsim rau saum npoo.
Ua ntej kos duab, TC4 billets underwent nto pretreatment, ntse npaj phosphate thiab oxalate lubricating coatings nrog thicknesses ntawm 2 μm thiab 20 μm, feem. Cov coatings nthuav tawm ntom adhesion rau lub substrate, muab cov cab kuj rau lubricant adhesion thiab cais cov billet los ntawm kev sib cuag ncaj qha nrog cov tuag. Kev txheeb xyuas lej tau txiav txim siab qhov tsis zoo ntawm qhov bar thiab hlau txias kos duab tuag, uas qhia tau hais tias lub zog deformation tseem qis dua thaum lub kaum sab xis ua haujlwm yog 10-12 degree.
Cov kev sim qhia tau hais tias oxalate lubrication txheej yog zoo dua nyob rau hauv TC4 txias daim duab, uas ua rau ntau dua nto zoo ntawm cov kos billet. Tom qab plaub daim duab sib law liag, tag nrho cov deformation ntawm lub billet nce mus txog 45%, ua tau raws li qhov yuav tsum tau ua rau ntau lawm.
Tom qab kos duab txias, lub zog ntawm TC4 titanium alloy nce thaum nws elongation txo qis, nthuav tawm kev ua haujlwm tseem ceeb. Annealing restores lub plasticity ntawm lub billet yam tsis muaj kev cuam tshuam rau lub caij txias daim duab tom ntej. Tom qab annealing, cov qauv nplej yog equiaxed, thiab qib ntawm equiaxing nce nrog nce deformation.
