TA18 Titanium Alloy Tube (Ti-3Al-2.5V): Cov khoom, kev ua haujlwm thiab kev siv
Mar 12, 2024
TA18 Titanium Alloy Tube yog dab tsi?
TA18 yog Suav lub npe rau ze rau -alpha titanium alloy Ti-3Al-2.5V, tsim los ntawm Ti-6Al-4V (TC4) alloy system tab sis nrog txo cov txhuas thiab vanadium cov ntsiab lus los txhim kho qhov txias formability thiab weldability. Hauv cov kev qhia tshwj xeeb thoob ntiaj teb, tib lub npe hu ua Qib 9 (UNS R56320). TA18 tubing ua ke nrog chav-kub thiab elevated-kub lub zog txog 20-50% siab dua li kev lag luam ntshiab titanium nrog kev ua kom txias txias thiab vuam kev ua tau zoo dua li TC4 alloy.
Chemical Composition thiab Alloy Design
Cov alloy muaj nominally 3% txhuas thiab 2.5% vanadium, nrog rau qhov sib npaug titanium. Aluminium stabilizes alpha theem thiab muab cov khoom ruaj khov- kev daws teeb meem; vanadium stabilizes theem beta thiab txhim kho kev ua haujlwm. Vim tias tag nrho cov alloying ntxiv yog qis dua hauv Ti-6Al-4V, TA18 khaws qhov zoo ze-alpha microstructure nyob rau hauv cov txheej txheem annealed, muab nws ib qho kev sib xyaw ua ke ntawm nruab nrab lub zog, ductility thiab tiv thaiv kev ntxhov siab corrosion.
Mechanical Properties thiab kev sib piv
| Khoom | TA18 / Qib 9 (Ti-3Al-2.5V) | CP Titanium Qib 2 | TC4 / Qib 5 (Ti-6Al-4V) |
|---|---|---|---|
| Tensile zog, min | 620 MPa rau | 345 MPa rau | 895mpa ua |
| Yield zog, min | 483 MPa ua | 275 MPa rau | 828MPa ua |
| Elongation, min | 15% | 20% | 10% |
| Txias formability | Zoo | Zoo heev | Txwv tsis pub |
| Weldability | Zoo | Zoo | Nruab nrab |
Tus nqi rau TA18 yog raws li ASTM B861 Qib 9 tube yuav tsum. Qhov kev sib piv qhia tau hais tias vim li cas TA18 raug xaiv thaum lub zog siab dua li CP titanium xav tau tab sis qhov tseem yuav tsum tau tsim los yog welded yam tsis muaj teeb meem.
Daim ntawv thov
TA18 seamless raj yog dav siv nyob rau hauv aerospace hydraulic, roj thiab pneumatic systems ua hauj lwm txog li 315 deg C, qhov twg siab tsis kam, lub teeb yuag thiab tsis muaj teeb meem. Cov khoom sib xws muaj xws li aircraft hydraulic kab, cav piping thiab lub teeb structural tubing. Sab nraum aerospace, TA18 raj yog siv rau tsheb kauj vab thav duab, marine instrumentation, tshuaj ua kab thiab lwm yam kev siv uas yuav tsum tau ib tug weldable, corrosion-resistant, nruab nrab- lub zog titanium raj.
Processing thiab Fabrication
Txias ua hauj lwm thiab tsim
TA18 tuaj yeem ua haujlwm txias thiab txias tsim. Nyob rau hauv txias pilgering thiab kos duab, tus nqi pub, dov ceev thiab kev sib txhuam yuav tsum sib npaug: ntau npaum li cas pub tsub kom tsim load thiab yuav ua rau tawg los yog folding, thaum ntau dua dov ceev txo cov strain Cheebtsam thiab ntsug load. Rau tuab- cov phab ntsa phab ntsa ua rau muaj qhov tsis xws luag sab hauv, qhov kev sib txhuam siab dua me ntsis feem ntau pom zoo kom tswj cov phab ntsa tuab.
Nto Finishing
Electrolytic- sib nqus sib nqus sib tsoo yog txoj hauv kev ua tiav zoo rau TA18 raj nplaim. Nyob rau hauv kev tswj xyuas, burrs thiab khawb raug tshem tawm thiab qhov chaw roughness tuaj yeem txo los ntawm Ra 1.6 um mus rau Ra 0.13 um, txhim kho kev qaug zog thiab kev tiv thaiv corrosion. Cov raj tiav lawm feem ntau muab cov khoom noj, polished lossis passivated.
Vuam
TA18 welds tau yooj yim nrog roj tungsten arc vuam siv cov muab tub lim, nrog argon shielding ntawm ob sab kom tsis txhob muaj pa oxygen thiab nitrogen. Post-weld annealing yog siv thaum yuav tsum muaj qhov siab tshaj plaws ductility.
Standards thiab Equivalents
Tuam Tshoj: TA18 rau GB / T 3625 thiab GB / T 12969.
International: Qib 9 rau ASTM B861 (seamless raj), ASTM B338 (welded raj), ASTM B862 (welded loj- txoj kab uas hla).
aircraft Lub foob npas AMS4943 sau npe hauv Is Nrias teb
UNS: R56320.
FAQ
Puas yog TA18 zoo ib yam li Qib 9 titanium?
Yog lawm. TA18 yog Suav tsim rau Ti-3Al-2.5V, uas sib haum rau Qib 9 (UNS R56320) hauv ASTM thiab AMS specifications.
Qhov kev pabcuam siab tshaj plaws ntawm TA18 raj yog dab tsi?
TA18 Cheebtsam feem ntau yog tsim los rau kev pabcuam txog li 315 deg C, qhov twg cov hlau tseem muaj zog thiab oxidation tsis kam.
Vim li cas thiaj xaiv TA18 hloov TC4 (Ti-6Al-4V)?
TA18 muaj qhov zoo tshaj qhov txias formability thiab weldability tshaj TC4 thaum muab txog 20-50% siab zog dua titanium ntshiab; TC4 yog qhov nyiam tsuas yog qhov uas yuav tsum muaj lub zog siab tshaj plaws thiab tsim kev nyuaj siab tsawg.
TA18 raj puas tuaj yeem welded?
Yog lawm. TA18 muaj qhov zoo weldability siv GTAW nrog argon shielding; post-weld annealing yog pom zoo thaum xav tau tag nrho ductility.
Dab tsi nto tiav rau TA18 raj?
Pickled, polished, passivated thiab tshwj xeeb hauv av tiav yog muaj; electrolytic- sib nqus sib nqus tuaj yeem ua tiav Ra qhov txiaj ntsig mus txog 0.13 um.
Cov qauv dab tsi tswj hwm TA18 raj xa khoom?
Thoob ntiaj teb, ASTM B861 thiab ASTM B338 tswj seamless thiab welded raj feem, nrog AMS 4943 rau aerospace hydraulic tubing; Hauv Suav teb, GB / T 3625 siv.
