TC4 thiab TC4 ELI Tsawg-Interstitial Titanium: Kev sib xyaw, Toughness thiab Cryogenic Siv
Mar 12, 2024
Ib qho Alloy, Ob Lub Ceilings Interstitial
TC4 ELI tsis yog qhov sib txawv alloy. Nws yog Ti-6Al-4V nrog cov ntsiab lus sib txuam tuav kom nruj dua: oxygen, nitrogen, hlau thiab hydrogen raug txo, thiab cov pa roj carbon tswj tau nyob rau tib theem. Aluminium thiab vanadium bands nyob qhov twg lawv nyob. Ib qho kev hloov pauv ntawd yog qhov hloov pauv lub hom phiaj dav dav rau hauv cov khoom tsim nyog rau kev pabcuam cryogenic thiab rau kev cog qoob loo.
Kev lag luam yog ncaj nraim. Cov ntsiab lus qis interstitial txhais tau tias qis zog thiab ua kom zoo dua toughness thiab ductility. Cov neeg yuav khoom uas xaj ELI rau ib feem uas tsis xav tau qhov hnyav yog them tus nqi them tsis muaj dab tsi; cov neeg yuav khoom uas xaj tus qauv TC4 rau cov kua dej -hydrogen tank lossis femoral qia tau ua rau muaj kev pheej hmoo tias cov ntsiab lus interstitial tsis tau tsim los npog.
Kev sib piv ntawm Chemistry
| Element | TC4 txheem | TC4 ELI | Qhov cuam tshuam ntawm kev txwv nruj |
|---|---|---|---|
| Al | 5.5–6.75 % | 5.5–6.5 % | Narrower band rau implant qib |
| V | 3.5–4.5 % | 3.5–4.5 % | Tsis hloov |
| O | 0.20% max | 0.13% max | Tus tsav tsheb tseem ceeb ntawm qhov sib txawv toughness |
| N | 0.05% max | 0.03% max | Tiv thaiv kev poob ntawm ductility thiab weld cracking |
| Fe | 0.30% max | 0.25% max | Txo cov beta theem tawg |
| C | 0.08% max | 0.08% max | Tsis hloov |
| H | 0.015% max | 0.0125% max | Txo hydride embrittlement txaus ntshai |
Oxygen ua haujlwm feem ntau. Nws yog ib qho alpha stabilizer thiab ib qho kev daws teeb meem muaj zog, yog li txhua qhov ntxiv 0.01% nce yield zog thiab txiav tawg toughness. Tias yog vim li cas tus qauv TC4 cua sov ntawm 0.18% oxygen tuaj yeem muaj zog dua li ELI cua sov ntawm 0.10% thiab tib lub sijhawm tsis muaj kev puas tsuaj tsawg dua.
Kev lees txais txiaj ntsig raws li kev cog lus thiab Aerospace Specifications
ASTM F136 npog wrought Ti-6Al-4V ELI rau kev phais cov ntawv thov kev cog lus thiab teeb tsa cov cuab yeej cuab tam uas cog cov neeg tsim khoom tau lees paub tiv thaiv: 860 MPa yam tsawg kawg nkaus tensile lub zog, 795 MPa yam tsawg kawg nkaus lub zog, 10% yam tsawg kawg nkaus elongation thiab 25% qhov tsawg kawg nkaus txo ntawm cheeb tsam. TS EN ISO 5832-3 npog tib qho kev cog ntoo rau kev cog qoob loo nrog cov qauv kev lees paub zoo sib xws. Ntawm sab aerospace, qib ELI tshwm nyob rau hauv ASTM B348 rau bar thiab billet thiab hauv ASTM B265 rau cov khoom tiaj tus, nyob rau hauv txhua rooj plaub nrog lub tighter interstitial qab nthab nqa nyob rau hauv lub chemistry rooj.
Piv nrog rau tus qauv qib ntawm 895 MPa yam tsawg kawg nkaus tensile thiab 828 MPa yam tsawg kawg nkaus tawm los, cov ELI pem teb yog qis dua. Qhov ntawd yog txhob txwm tshaj tawm: qib raug xaiv rau qhov tawv thiab kev ntseeg siab, tsis yog rau tus lej siab tshaj ntawm daim ntawv pov thawj.
Vim li cas Toughness Matters hauv Cryogenic Service
Tus qauv TC4 tseem siv tau ntawm qhov kub thiab txias, tab sis nws cov ntsiab lus interstitial txwv kom deb li deb ntawm qhov toughness margin txuas mus. Qib ELI khaws cov alpha theem sib xyaw ua ke ntau dua thiab txo qhov kev nyiam rau kev coj cwj pwm nkig thaum kub poob, uas yog qhov tso cai rau nws siv hauv cryogenic engineering, hauv cov kua roj tuav thiab hauv cov qauv uas ua ke nrog qhov kub thiab txias nrog dynamic load.
Cov txheej txheem tsis zoo ib yam li cov hlua khi - mus rau - kev hloov pauv hauv cov hlau ferritic. Titanium khaws cov qauv hexagonal thiab tsis ua iav - nkig, tab sis txo cov ntsiab lus interstitial khaws cia cov yas deformation muaj peev xwm ua rau cov qauv rov faib cov kev ntxhov siab nyob ib puag ncig kev ntxhov siab ntau dua li tawg ntawm nws.
Kev siv kho mob thiab phais mob
Cov ntsiab lus qis interstitial kuj yog daim pib nkag rau cov ntawv thov cog. Biocompatibility zoo dua, tsis tshua muaj elastic modulus txheeb ze rau stainless hlau thiab cobalt-chromium alloys, tsawg ntom, corrosion kuj, non-toxicity, siab yield zog thiab lub neej qaug zog ntev ua rau qib ib tug qauv xaiv rau load- bearing implant Cheebtsam. Kev kho mob cov khoom lag luam hauv qib no yog siv rau kev kho pob txha cranial thiab pob txha grafting, qhov twg lub zog, qaug zog lub neej thiab plasticity yuav tsum nruj dua li kev ua haujlwm hauv kev lag luam.
Implant manufacturers yuav rau ASTM F136 los yog ISO 5832-3 thiab feem ntau yuav tsum tau kuaj ultrasonic, tag nrho traceable melt keeb kwm thiab kev ywj pheej los ntawm alpha rooj plaub, vim hais tias ib tug nyuaj, oxygen-nplua nuj txheej nto yog ob qho tib si ib tug qaug zog pib qhov chaw thiab ib tug neeg pluag substrate rau cov kev kho mob nto thov tom qab.
Kev xaiv ntawm ob
| Kev xav tau | Kev xaiv | Yog vim li cas |
|---|---|---|
| General structural qhov chaw, ambient thiab sov kev pab cuam | TC4 txheem | Ntau zog pem teb, tus nqi qis, muaj dav |
| Cryogenic tanks, kab thiab kev txhawb nqa | TC4 ELI | Khaws toughness ntawm qhov kub thiab txias |
| Implants thiab phais instrumentation | TC4 ELI | ASTM F136 thiab ISO 5832-3 kev tsim nyog |
| Kev qaug zog qhov tseem ceeb nrog cov yam ntxwv ntse | TC4 ELI | Toughness margin ntawm kev nyuaj siab concentration |
| Siab tuav qhov chaw tsim los rau lub zog txwv | TC4 txheem | Ntau qhov tsawg kawg nkaus tawm los simplifies phab ntsa thickness xam |
Cov lus nug nquag
Q:ELI qhov tseeb yog dab tsi?
A: Ntxiv qis interstitial. Nws tsuas yog hais txog kev tswj chemistry xwb. Cov txheej txheem alloy, aluminium thiab vanadium bands thiab cov qauv siv lead ua yog tib yam li cov qauv qib.
Q:Puas yog TC4 ELI muaj zog dua tus qauv TC4?
A: Tsis yog. Qhov tsawg kawg nkaus txais qhov tseem ceeb yog qis dua vim tias cov ntsiab lus interstitial raug txo. Cov txiaj ntsig yog toughness, ductility thiab kev ntseeg siab ntawm qhov kub thiab txias, tsis muaj zog.
Q:Vim li cas cov pa oxygen txwv nruj heev nyob rau hauv qib qis -interstitial?
A: Oxygen ntxiv dag zog rau alpha theem thiab tsa cov beta transus thaum txo cov tawv nqaij. Capping nws ntawm 0.13% yog dab tsi khaws cov yas deformation muaj peev xwm qib tau yuav rau.
Q:Ob qib puas tuaj yeem txuas rau ib leeg?
A: Yog, thiab cov vuam yog metallurgically suab, tab sis qhov sib koom ua ke yuav siv cov ntsiab lus ntawm qhov muab tub lim thiab qhov chaw dilution. Ntawm qhov chaw cryogenic los yog cog cov txheej txheem vuam yog ib txwm tsim nyog nrog kev sib tw qis -interstitial muab tub lim thiab kuaj raws li.
Q:Cov kev qhia tshwj xeeb twg siv rau cov khoom siv kho mob?
A: ASTM F136 npog wrought Ti-6Al-4V ELI rau kev cog hniav thiab ISO 5832-3 npog tib tsev neeg hlau. Chemistry, mechanical values, ultrasonic kuaj thiab kev ywj pheej ntawm alpha rooj plaub yog cov ntsiab lus lees paub.
Q:Cov qhab nia txheeb xyuas li cas ntawm kev xa khoom?
A: Los ntawm cov ntawv pov thawj chemistry nrog rau cov pa oxygen, nitrogen thiab hydrogen los ntawm tus qauv tus neeg sawv cev ntawm daim ntawv xa, ua ke nrog cov txiaj ntsig tensile thiab, rau kev txiav txim kho mob thiab aerospace, kuaj ultrasonic. Interstitial gases yog thawj yam khoom los xyuas.
