Gr9 Titanium (Ti-3Al-2.5V) Tubing rau Aerospace Hydraulic Systems
Apr 07, 2024
Gr9 Titanium yog dab tsi
Gr9, kuj sau Qib 9 thiab tus qauv raws li UNS R56320, yog titanium alloy Ti-3Al{10}}2.5V. Nws zaum ntawm kev lag luam ntshiab titanium thiab cov neeg ua haujlwm Ti-6Al-4V hauv tsev neeg qib: alloyed txaus kom ncav cuag li 620 MPa tensile lub zog nyob rau hauv cov mob annealed, tab sis tseem ductile thiab txias-formable txaus los ua raws li nyias-phab ntsa seamless thiab welded tubing. Nws cov beta transus yog kwv yees li 935 degree, uas yog qis dua piv nrog Ti-6Al-4V thiab ua rau cov hlau sib piv tau yooj yim.
Cov khoom siv tau teev nyob rau hauv cov qauv khoom lag luam xws li ASTM B338 rau welded thiab seamless raj, thiab nyob rau hauv cov khoom sib txuas thiab cov qauv forging rau Tshuag siv los ua fittings. Aerospace tubing specifications ntxiv qhov yuav tsum tau rau grain loj, nto tiav, nondestructive kuaj thiab huv.
Chemistry thiab Mechanical Properties
| Element | Kev xav tau |
| Aluminium | 2.5 - 3.5 % |
| Vanadium | 2.0 - 3.0 % |
| Hlau | 0.25% max |
| Oxygen | 0.12% max |
| Nitrogen | 0.03% max |
| Cov pa roj carbon | 0.08% max |
| Hydrogen | 0.015% max |
| Lwm cov ntsiab lus, txhua / tag nrho | 0.10% max / 0.40% max |
| Khoom, annealed tube | Yam yuav tsum tau muaj |
| Tensile zog | 620 MPa min |
| Yield zog (0.2% offset) | 483 MPa min |
| Elongation | 15% min |
| Qhov ntom | 4.48 g / cm³ |
| Elastic modulus | kwv yees . 100 GPa |
Piv nrog rau austenitic stainless tube cov hlau alloy yog kwv yees li 40% sib dua rau tib lub bore thiab phab ntsa, thiab nws lub zog yog khaws cia rau qhov ntau dua ntawm qhov kub siab. Qhov sib ntxiv ntawm txhuas muab cov khoom siv- kev daws teeb meem thiab txhawb nqa cov beta transus txheeb ze rau titanium ntshiab; qhov ntxiv vanadium stabilizes beta theem thiab txhim kho kev ua haujlwm kub.
Vim li cas Aerospace Hydraulic Systems Siv Gr9 Tubing
Qhov hnyav.Hydraulic kab khiav qhov ntev ntawm ib qho airframe. Hloov cov raj stainless nrog Gr9 txuag huab hwm coj ntawm txhua kab thiab, vim tias cov kab dej hydraulic muaj ntau heev, kev txuag tau khaws cia thoob plaws lub dav hlau.
Siab muaj peev xwm.Aerospace hydraulic systems ua haujlwm ntawm lub siab nominal siab, thiab nyias -phab ntsa lub zog ntawm Ti-3Al-2.5V tubing tso cai rau ib phab ntsa me me rau qhov yuav tsum tau tawg ntau dua li lub raj stainless sib piv.
Kev vibration thiab qaug zog.Cav thiab airframe kev co imposes cyclic dabtsi yog khoov ntawm kab thiab fittings; lub alloy muaj zoo qaug zog tiv thaiv nyob rau hauv lub annealed mob, tshwj xeeb tshaj yog qhov twg khoov, clamps thiab kev txhawb nqa yog positioned kom raug.
Corrosion kuj.Cov yeeb yaj kiab oxide tsis muaj zog tiv thaiv cov kua dej hydraulic, noo noo, tshuaj tsuag ntsev thiab cov tshuaj ntxuav feem ntau, kom tsis txhob muaj qhov pitting thiab kev ntxhov siab - kev txhawj xeeb corrosion uas cuam tshuam rau siab - lub zog steels nyob rau hauv marine ib puag ncig.
Qhov kub thiab txias.Cov hlau ua tau zoo los ntawm cov kev pabcuam cryogenic tau ntsib nyob ib puag ncig roj thiab inerting systems mus txog rau qhov hydraulic system kub, tsis muaj cov ductile - brittle hloov ntawm ferritic steels.
Sizing, dabtsi yog khoov thiab installation xyaum
Aerospace raj qhov ntau thiab tsawg yog hais raws li sab nraud txoj kab uas hla nrog phab ntsa thickness, nyob rau hauv ob nti thiab metric series. Kev ua lag luam ib txwm muaj xws li:
Khoov vojvoog yog khaws cia rau qhov tsawg kawg nkaus qhov tshwj xeeb tso cai rau txoj kab uas hla thiab phab ntsa siv; nruj dua radii yuav tsum khoov nrog kev txhawb nqa sab hauv, xws li mandrel lossis fusible muab tub lim, tiv thaiv ovality thiab phab ntsa thinning ntawm sab nraud ntawm qhov khoov.
Khoov txias yog ib txwm rau nyias -wall Gr9 raj. Springback yog qhov tseem ceeb thiab tau them nyiaj rau hauv cov cuab yeej es tsis yog dhau ntawm - khoov ntawm lub dav hlau.
Kev npaj kawg ua raws li qhov kev sib haum xeeb hauv kev siv. Flareless fittings thiab flared fittings txhua tus yuam lawv tus kheej cov kev cai ntawm kev txiav squareness, deburring thiab phab ntsa mob, thiab tube kawg yog ib txwm tshuaj xyuas ua ntej sib dhos.
Clamping spacing yog teem kom cov kab tsis vibrate tiv thaiv cov qauv. Kev sib cuag ntawm lub raj titanium thiab cov hlau tsis sib xws yog zam qhov twg galvanic lossis fretting puas tuaj yeem ua tau.
Cov raj yog tuav thiab khaws cia nrog lub hau kawg. Titanium yog notch-sensitive nyob rau hauv qaug zog, thiab ib tug khawb nyob rau sab nraud txoj kab uas hla ntawm ib tug nyias - phab ntsa kab yog ib tug kev nyuaj siab.
Vuam thiab kev kho cua sov
Gr9 raj yog welded los ntawm roj tungsten arc vuam nrog siab -purity argon shielding, thiab rau qhov tseem ceeb aerospace pob qij txha vuam yog nqa tawm nyob rau hauv ib tug kaw chamber los yog trailing shields kom lub pob qij txha nyob twj ywm kaj thiab unoxidized. Txawm tias lub teeb decoloration qhia tau hais tias oxygen thiab nitrogen khaws thiab feem ntau tsis lees paub. Nyias- cov kab phab ntsa yog nquag welded autogenously, tsis muaj muab tub lim, ntawm ib tug squared pob tw; thicker seem siv txuam titanium muab tub lim.
Tom qab kev tsim thiab vuam, cov khoom raug ntxuav, khaws cia qhov chaw tso cai kom tshem tawm cov kab mob, thiab kho cua sov hauv lub tshuab nqus tsev lossis inert cua. Kev ntxhov siab feem ntau yog ua nyob rau hauv thaj tsam ntawm 540 - 650 degree, zoo hauv qab beta transus, kom cov qauv zoo alpha + beta tsim los ntawm kev tsim cov raj yog khaws cia. Txhua qhov kev kho cua sov saum lub transus yuav coarsen tus qauv thiab txo ductility.
Cov kev xav tsis zoo thiab kev txwv kev xaiv
Gr9 tsis yog qhov hloov pauv rau Ti-6Al-4V qhov twg yuav tsum muaj lub zog zoo li qub. Rau cov qauv fittings thiab brackets qib siab zog tseem yog qhov kev xaiv ib txwm muaj.
Gr9 raj tsis hloov pauv nrog Gr9 daim ntawv lossis bar rau kev tsim qauv. Cov khoom yog tsim los ntawm cov khoom siv thiab cov khoom siv raws li tus qauv, thiab tubing tolerances thiab kev xeem yuav tsum txawv ntawm cov phaj lossis bar.
Lub sijhawm ntev - kev pabcuam hauv huab cua ntawm qhov kub siab yog txwv los ntawm kev nqus pa thiab kev loj hlob ntawm cov pa; cov alloy yuav tsum tsis txhob siv sab nraum qhov kub thiab txias uas tsim nyog rau daim ntawv thov.
Kev ua haujlwm txias ua thaum khoov tsa lub zog hauv zos thiab txo qis hauv zos ductility. Qhov twg ib feem yog tom qab kev ntxhov siab rau kev txhim kho corrosion lossis qaug zog, kev kho mob yuav tsum tau sib haum nrog lub raj temper teev.
FAQ
Q: Dab tsi yog Gr9 titanium?
Gr9 yog Ti-3Al-2.5V, UNS R56320, ib qho alpha + beta titanium alloy nrog roughly 620 MPa lub zog tensile yam tsawg kawg nkaus hauv cov mob annealed, dav siv rau aerospace hydraulic tubing.
Q: Dab tsi yog qhov txawv ntawm Gr9 thiab Qib 2 titanium?
Qib 2 yog kev lag luam ntshiab titanium nrog qis zog tab sis zoo formability thiab weldability. Gr9 yog alloyed thiab muaj zog heev, yog li nws yog siv nyob rau hauv qhov chaw siab thiab hnyav tsav tus tsim.
Q: Tus qauv twg npog Gr9 tubing?
ASTM B338 npog seamless thiab welded titanium alloy raj, suav nrog Qib 9; bar thiab forging Tshuag rau fittings yog them los ntawm cov khoom siv titanium cov qauv, nrog rau aerospace specifications ntxiv kev soj ntsuam thiab kev huv huv.
Q: Gr9 raj puas tuaj yeem khoov txias?
Yog lawm, nyias-phab ntsa Gr9 raj yog ib txwm txias khoov. Kev txhawb nqa sab hauv thiab tswj lub vojvoog khoov yog siv los txwv ovality, thiab springback yog them rau hauv cov cuab yeej.
Q: Vim li cas yuav tsum Gr9 welds ci?
Xim ntawm lub titanium weld qhia cov pa oxygen thiab nitrogen paug ntawm qhov chaw, uas ua rau lub pob qij txha. Ci ntsa iab, silvery weld thiab tshav kub- thaj tsam cuam tshuam yog qhov kev lees paub.
Q: Puas yog Gr9 haum rau siab -kev pabcuam kub?
Nws yog siv nyob rau hauv ntau yam xws li cryogenic thiab sov hydraulic kev pab cuam, tab sis tsis tu ncua raug rau huab cua ntawm qhov kub thiab txias yog txwv los ntawm oxidation thiab oxygen diffusion rau hauv cov hlau.
