TC4 / Gr5 Ti-6Al-4V Titanium Alloy Sheet, Phaj thiab Thaiv: Cov ntaub ntawv thiab Tshuag Ntau
Mar 12, 2024
Alloy Identity thiab Vim Li Cas Nws Dominates
TC4 yog Suav lub npe rau cov hlau uas lub lag luam thoob ntiaj teb hu rau Qib 5 lossis Ti-6Al-4V. Nws yog alpha-beta alloy nrog 6% txhuas raws li alpha stabilizer thiab 4% vanadium raws li cov beta stabilizer, thiab nws yog cov khoom siv dav tshaj plaws thiab feem ntau ua cov alpha-beta titanium alloy hauv ntiaj teb no, tsuas yog vim tsis muaj lwm qib ntais nws cov kev sib xyaw ua ke ntawm lub zog, toughness, weldability thiab industrial availability.
Kev pabcuam kub yog ib txwm hais raws li 400℃txuas ntxiv, nrog rau kev mus ncig luv luv mus rau 450℃siv tau rau ntau yam qauv. Lub qab nthab, ua ke nrog qhov ntom ntawm 4.43 g / cm³ thiab lub zog tensile hauv pem teb ntawm 895 MPa, yog dab tsi tso cov hlau rau hauv lub cav kiv cua thiab compressor kho vajtse, airframe beams, pob qij txha thiab bulkheads, thiab ntau yam kev lag luam thiab kev kho mob yam tsis tau tawm hauv av.
Cov txheej txheem los ntawm Cov Khoom Siv
Daim ntawv khoom txiav txim siab qhov tshwj xeeb. ASTM B265 npog phaj, ntawv thiab sawb; AMS 4911 npog cov ntawv annealed thiab strip rau aerospace siv; ASTM B348 npog bar thiab billet; ASTM B381 npog forgings. Nyob rau hauv Suav system, GB / T 3620.1 teeb tsa thiab chemistry txwv, thiab GB / T 3621 npog titanium thiab titanium alloy phaj, ntawv thiab sawb. Daim ntawv xaj yuav tsum tau sau npe rau cov khoom lag luam, tsis yog qib xwb, vim tias kev lees txais cov khoom siv kho tshuab thiab cov kev tso cai tsis zoo sib txawv ntawm lawv.
Chemistry Qhov rai
| Element | Ntau los yog siab tshaj plaws | Cov nyhuv yog tawm ntawm qhov rais |
|---|---|---|
| Al | 5.5–6.75 % | Hauv qab band, lub zog poob; saum toj band, alpha embrittlement txaus ntshai |
| V | 3.5–4.5 % | Tswj beta theem feem thiab hardenability |
| Fe | 0.30% max | Beta stabilizer; tshaj txo oxidation kuj |
| O | 0.20% max | Nce lub zog thiab beta transus, depresses toughness |
| N | 0.05% max | Lub zog muaj zog, txiav ductility sai |
| C | 0.08% max | TiC tsim tshaj qhov kev txwv ntawm solubility |
| H | 0.015% max | Hydride embrittlement |
| Ti | Tshuav | Matrix |
Mechanical thiab Physical Data
| Khoom | Annealed | Tshuaj kho thiab laus |
|---|---|---|
| Tensile zog | 895 MPa rau min | Feem ntau 1,000-1,150 MPa |
| Lub zog muaj zog, 0.2% | 828MPa min | Feem ntau 930-1,080 MPa |
| Elongation | 10% min | Feem ntau 8-12% |
| Kev txo qis ntawm cheeb tsam | 25% min | qis, nyob ntawm seem |
| Hardness | Txog 30–36 HRC | Txog li 40 HRC |
| Qhov ntom | 4.43 g / cm³ | Tsis hloov |
| Elastic modulus | 110 GPa | Marginally siab dua |
| Thermal conductivity | Txog 7 W / (m·K) | Tsis hloov |
| Linear expansion, 20-100 degree | 8.6 × 10⁻⁶ /K | Tsis hloov |
| Beta transus | Kwv yees li 995 degree | Tsis hloov |
Ob tug ntawm cov lej no tsav lub khw-kev txiav txim hauv pem teb. Ib qho elastic modulus ntawm 110 GPa yog kwv yees li ib nrab ntawm cov hlau, yog li cov khoom siv rov qab li ob zaug kom deb li deb tom qab kev tsim lossis kev ua haujlwm dhau los, thiab cov cuab yeej yuav tsum tso cai rau nws. Thermal conductivity nyob ze 7 W / (m·K), kwv yees li ib feem kaum ntawm txhuas, txhais tau hais tias tshav kub los ntawm kev txiav nyob rau hauv lub cuab tam thiab lub workpiece, uas yog vim li cas titanium yog machined nyob rau hauv qis nto ceev nrog hnyav coolant ntws tshaj hlau.
Sheet, Phaj thiab Thaiv: Ib txwm Mill Supply
| Daim ntawv | Hom thickness ntau | Hom dav lossis loj | Kev xa khoom |
|---|---|---|---|
| Daim ntawv | 0.5-6.0 hli | Txog li 1,500 mm dav | Annealed, pickled los yog ci |
| Phaj | 6-100 hli | Txog li 2,000 mm dav | Annealed, machined nto |
| Thaiv thiab billet | Txog li 300 mm seem | Txiav kom loj | Annealed, sawn los yog machined |
| Sawb thiab coil | 0.3-3.0 hli | Coil rau qhov dav dav | Annealed, descaled |
Anneal yog qhov kev xa khoom tsis zoo rau cov khoom lag luam vim nws tshuab kwv yees thiab cov ntawv tsis tawg. Cov tshuaj kho thiab cov khoom muaj hnub nyoog tau teev tseg rau cov khoom uas xav tau lub zog siab dua thiab hnav tsis kam, thiab nws raug nqi ntau dua vim yog cov kauj ruam quenching thiab vim yog qhov quench distortion uas yuav tsum tau ncaj qha tawm tom qab.
Fabrication Notes
TC4 welds nyob rau hauv ib qho chaw inert thiab yog niaj hnub koom los ntawm TIG nrog cov muab tub lim zoo sib xws, tab sis lub pas dej ua ke thiab cov cua sov uas nyob ib sab - raug cuam tshuam cheeb tsam yuav tsum tau tiv thaiv kom txog thaum lawv poob qis dua li 400℃lossis qhov chaw khaws cov pa thiab nitrogen. Cov hlau kuj tseem nthuav tawm cov cwj pwm superplastic nyob rau hauv qhov kub thiab txias thiab strain- tus nqi sib xyaw ua ke, uas yog lub hauv paus ntawm diffusion-bonded thiab superplastic tsim airframe panels. Machined nto yuav tsum tau kuaj xyuas cov pa oxygen-nplua nuj alpha ntaub ntawv tom qab ib tug kub forming los yog vuam ua hauj lwm, vim hais tias ib tug tawv, brittle daim tawv nqaij ntawm ib tug load- bearing nto yog ib tug qaug zog pib qhov chaw.
Cov lus nug nquag
Q:Puas yog TC4 zoo ib yam li Qib 5?
A: Hauv alpha-beta Ti-6Al-4V tsev neeg lawv xa mus rau tib lub alloy, tab sis cov ntawv pov thawj tau sau tawm tsam cov qauv sib txawv. Cov neeg yuav khoom yuav tsum nug cov qauv khoom, xws li ASTM B265 lossis ASTM B348, thiab sib piv cov kev txwv ntau dua li qhov sib npaug ntawm lub npe.
Q:Dab tsi yog qhov siab tshaj qhov kev pabcuam kub rau TC4?
A: Nyob ib ncig ntawm 400℃yog tus qauv tsim ib txwm, nrog luv luv - lub sijhawm ua haujlwm rau 450℃hauv ntau daim ntawv thov. Saum toj no ntau yam oxidation thiab interstitial pick- los ua qhov txwv tsis pub, tsis muaj zog txhua yam.
Q:Yam xwm txheej twg yuav tsum raug txiav txim rau lub tshuab ua qauv?
A: Annealed, feem ntau. Nws yog qhov ruaj khov dua tom qab machining, pheej yig dua thiab yooj yim rau qhov chaw. Cov tshuaj kho thiab cov hnub nyoog Tshuag yog tsim nyog tsuas yog qhov yuav tsum tau muaj zog nce ntxiv.
Q:Vim li cas TC4 xav tau lub vojvoog khoov dav dua li cov hlau?
A: Vim hais tias nws elastic modulus yog ib nrab ntawm cov hlau, yog li nws springs rov qab roughly ob zaug kom deb li deb. Khoov radii thiab tuag them nyiaj raws li qhov loj me, thiab txias tsim hauv qab li 3 hli tuab kuj tseem yuav xav tau kev ntxhov siab tom qab.
Q:Cov ntaub ntawv alpha raug tshem tawm li cas tom qab ua haujlwm kub?
A: Los ntawm pickling nyob rau hauv ib tug tswj acid da dej los yog machining qhov cuam tshuam qhov tob. Cov txheej tawv tawv feem ntau ncav cuag 0.1-0.15 hli, thiab cov khoom seem ntawm qhov qaug zog- qhov chaw tseem ceeb yog qhov tsis xws li qhov ntsuas qhov ntev npaum li cas.
Q:TC4 phaj puas tuaj yeem welded rau hauv cov khoom siv siab?
A: Yog, nrog kev tiv thaiv tsis zoo thiab kev tsim nyog ntawm cov txheej txheem vuam. Tsim cov lej thiab cov qauv tsim khoom siv tau teeb tsa kev ua haujlwm sib koom ua ke thiab cov kev xeem yuav tsum tau ua, thiab cov cua sov- raug cuam tshuam yuav tsum raug ntxuav thiab, qhov xav tau, tshuaj xyuas cov ntaub ntawv alpha.
