BT16 titanium alloy rau txias taub hau fastener kev ua tau zoo

Ti-3AI-5Mo-4.5V titanium alloy (BT16) yog tsim los ntawm Lavxias Lub Teeb Alloy Research Institute. Nws yog lub zog siab, hom tshiab ntawm ob-theem titanium alloy. Nws muaj cov cuab yeej zoo heev thiab cov khoom ua kom txias txias. Cov yam ntxwv tseem ceeb ntawm cov khoom siv ua tiav no yog dov thiab kos cov xov hlau thiab tuav nrog txoj kab uas hla ntawm 4 mus rau 10 hli, uas tuaj yeem siv los tsim cov ntsia hlau, bolts, rivets thiab lwm yam aviation fasteners los ntawm lub taub hau txias.

Cov yam ntxwv ntawm BT16 titanium alloy yog: nws muaj ib tug me me ntawm Al, ib tug loj npaum li cas ntawm -stabilizing caij (Mo), lub -phase stability coefficient K yog siab li 0.8, cov ntsiab lus -phase yog txog 25% ~ 30%, thiab nws muaj kev ua haujlwm siab hauv lub xeev annealed lossis quenched. ruaj khov. Plasticity, txawm hais tias cov khoom siv + kev laus alloy muaj zog dua, lub plasticity tsis txo qis. Cov theem hloov pauv tseem ceeb uas tshwm sim hauv titanium alloys thaum kho cua sov yog 'theem, ″ theem thiab quenching aging theem.

Russia siv annealed BT16 alloy hlau rau txias taub hau los tsim aviation fasteners. Cov kws tshawb fawb hauv tsev thiab txawv teb chaws tau tshawb fawb ntau yam ntawm cov txheej txheem annealing, microstructure, theem qauv thiab txhua yam khoom ntawm BT16 titanium alloy. Txias deformation ntxiv dag zog rau cov hlua khi ua los ntawm BT16 alloy xav tau cov sij hawm ua haujlwm qis tshaj plaws thiab cov nqi thiab tuaj yeem siv tsis tau qis dua 160 degree; fasteners ua los ntawm kev daws-hnub nyoog BT16 alloy tuaj yeem ua haujlwm ntawm qhov kub txog li 350 degree.

Txhawm rau muab cov ntsiab lus theoretical thiab cov ntaub ntawv sim rau kev tshawb fawb ntxiv thiab kev ua kom zoo ntawm BT16 titanium alloy thiab nws cov ntawv thov, cov kws tshawb fawb siv optical microscopy (OM), scanning electron microscopy (SEM), thiab lwm yam. alloy thaum lub sij hawm ntau lawm txheej txheem. (SEM) thiab kis tau tus mob electron microscopy (TEM). Thiab kev cuam tshuam ntawm cov txheej txheem kev kho cua sov ntawm cov khoom siv ntawm cov hlau alloy.

BT16 titanium alloy hlau nrog ib txoj kab uas hla ntawm 6.5 hli tau siv nyob rau hauv qhov kev sim, thiab nws cov tshuaj muaj pes tsawg leeg yog qhia nyob rau hauv Table 1. Cov txheej txheem ntawm cov hlau alloy yog: ingot casting → blanking → forging → dov. Ua ntej, ob lub tshuab nqus tsev electrode melting rauv yog siv kom tau txais Φ210mm BT16 titanium alloy ingots, thiab tom qab ntawd cov billets raug txiav. Qhov kub pib yog 1150 degree, qhov kawg kub yog tswj ntawm txog 800 degree, thiab ces kub forged rau hauv ib tug hlau pas nrig nrog ib txoj kab uas hla ntawm 7.5 hli. Kev kho annealing kawg: 780 degree rau 2 teev, rauv txias rau 550 degree, thiab tom qab ntawd cua txias. Qhov saum npoo ntawm tus pas nrig annealed tau polished los npaj rau kev sim ua kom txias.

BT16 titanium alloy hlau thiab cov qauv txias taub hau tau soj ntsuam thiab tshuaj xyuas siv LEICA DM2500M upright kis tau tus mob thiab kev cuam tshuam kho qhov muag microscope (OM), JEOL JEM? 2100 kis tau tus mob electron microscope (TEM) thiab JEOL JSEM? 7001F high-resolution scanning electron microscope (S) tsom xam. Cov tshuaj corrosion piv yog 2.5mLHf+3mLHNO3+5mLHCl+89.5mLH2O. Cov txiaj ntsig kev xeem yog raws li nram no:

(1) Cov txheej txheem annealing ntawm BT16 alloy hlau yog: 760 ~ 830 degree, 2h +550 degree, cua txias. Cov khoom siv hluav taws xob ntawm cov hlau tau txais yog raws li hauv qab no: σb yog 870 txog 935MPa, δ yog 22% txog 25%, thiab ψ yog 62% mus rau 65%. Nws lub taub hau txias deformation ncav cuag 80%. Cov qauv hlau tom qab annealing muaj thawj theem equiaxed, ib qho me me ntawm luv luv strip theem thiab intergranular theem.

(2) Tom qab kev daws teeb meem (cua txias) + kev laus, cov qauv hlau muaj qhov tsis xwm yeem equiaxed thawj theem thiab theem, thiab koob zoo li ' theem precipitates; Tom qab kev daws teeb meem (quenching) + aging, lub alloy muaj equiaxed theem muaj pes tsawg leeg. Ob lub xeev cov qauv tsim los ntawm theem pib thiab theem intergranular yog tsim los ntawm thawj theem, intergranular theem thiab koob zoo li 'theem precipitated nyob rau hauv theem.