Hauv cov txheej txheem titanium, cov kev ua minrord rau TA2 titanium yog kev txiav thiab vuam. Vim tias cov khoom siv lub cev tshwj xeeb thiab tshuaj lom neeg ntawm cov khoom no, cov vuam thiab tej cov txheej txheem yooj yim tsim cov kev tsis xws luag thiab thaj chaw cuam tshuam kub (HORD). Thaum vuam, ntau tus saib ntawm cov yam ntxwv ntawm lub cev hauv qab no ntawm titanium daim phiaj tau them:
Thermal nthuav tawm coefficient: autenenitic titanium phaj yog 1.5 npaug siab dua cov roj carbon titanium phaj.
Thermal Conductivity: tsuas yog 1/3 (Austenitic) lossis 1/2 (siab chromium) ntawm cov roj carbon titanium.
Cov kev tsis kam: Txog 4 zaug (Austenitic hom) lossis 3 zaug (siab chromium hom) ntawm cov roj carbonium titanium.
Ib qho ntxiv, cov ntsiab lus xws li ntom ntom, thaj av nro thiab magnetism kuj tseem muaj kev cuam tshuam ntau rau vuam zoo.
Cov teeb meem tseem ceeb ntawm kev ua tau zoo ntawm TA2 titanium phaj
1. Kev kub kub tawg
Hom: suav nrog solidification nrib pleb, microschopic nrib pleb, tshav kub kub sib tawg (haz) tawg thiab rov qab tawg.
Cause: ntsig txog kev vuam thermal voj voog, cov ntaub ntawv muaj pes tsawg leeg thiab kev ntxhov siab.
2. Tsawg Kub
Prone cov khoom siv: Martensitic Titanium Phaj thiab Ferritic Titanium Phaj Muaj cov qauv martensitic.
Cov laj thawj: Hydrogen diffusion, sib koom tes khi cov tawv nqaij thiab tawv tawv.
Kev daws: hydrogen resulation tswj, tsim nyog preheating thiab tom qab vuam kub kho, txwv kev txo.
3. Lub tawv ntawm welded pob qij txha txo qis
Austenitic titanium phaj: txhawm rau txhawm rau inhibit kub tawg, 5% {% ferrite yog khaws cia hauv daim ntaub, tab sis nws yuav txo qhov ntsuas kub tsawg.
Duplex titanium phaj: qhov txo ntawm Austenite nyob rau hauv lub teb vuam ua rau muaj kev txo qis hauv kev txo qis, thiab nce cov ferrite cov ntsiab lus yuav ua rau muaj kev cuam tshuam no tshwm sim.
Cov Phaj Purritic Herritic titanium Phaj: carbon, nitrogen impurities yog yooj yim los tsim oxide suav nrog los yog ua daus los nag.
4. Theem embrittlement
Prone cov khoom: Austenitic, ferritic thiab duplex daim hlau.
Ntau yam: {{600-900 degree (tshwj xeeb tshaj yog nyob ze 750 degree).
Kev tiv thaiv kev ntsuas: txo cov ntsiab lus ferritic thiab zam kev ntev ntev.
5. Mebrittlement ntawm 475 degree
Mechanism: Fe-Cr alloy is decomposed into low chromium α phase and high chromium α' phase (Cr>75%) thaum tuav ntawm 370-540 degree rau lub sijhawm ntev.
Cov nyhuv: ho txo cov plasticity thiab kev nruj ntawm cov khoom siv.
Lub ntsiab
Cov txheej txheem vuam ntawm Ta2 titanium phaj yuav tsum tau ua kom zoo rau cov pa hluav taws xob, thiab siv cov tshuaj tiv thaiv sov, kom tsis txhob tawg, emritting thiab tawv tawv ploj.