Cov koom haum tsis muaj txiaj ntsig, xov xwm, thiab cov pej xeem tuaj yeem rub tawm cov duab los ntawm MIT Press Office lub vev xaib raws li Creative Commons Attribution tsis yog lag luam, tsis yog daim ntawv tso cai.Koj yuav tsum tsis txhob hloov cov duab muab, tsuas yog qoob loo rau qhov loj me.Cov qhab nia yuav tsum tau siv thaum luam cov duab;"MIT" credit rau cov duab tshwj tsis yog sau tseg hauv qab no.
Kev kho cua sov tshiab tsim los ntawm MIT hloov cov microstructure ntawm 3D luam ntawv hlau, ua rau cov khoom muaj zog thiab tiv taus rau huab cua kub.Cov thev naus laus zis no tuaj yeem ua rau 3D luam ntawv ntawm cov hniav zoo nkauj thiab cov vanes rau cov roj turbines thiab cov dav hlau dav hlau uas tsim hluav taws xob, ua kom cov qauv tshiab los txo cov roj noj thiab kev siv hluav taws xob.
Niaj hnub no cov roj turbine hniav yog tsim los ntawm kev siv cov txheej txheem casting ib txwm nyob rau hauv uas molten hlau yog poured rau hauv complex duab thiab directionally solidified.Cov Cheebtsam no yog tsim los ntawm ib co ntawm cov feem ntau tshav kub-resistant hlau alloys nyob rau hauv lub ntiaj teb no, raws li lawv yog tsim los rau kiv ntawm high speeds nyob rau hauv tsis tshua muaj kub gases, extracting ua hauj lwm los tsim hluav taws xob nyob rau hauv fais fab nroj tsuag thiab muab thrust rau lub dav hlau engine.
Muaj kev txaus siab rau kev tsim cov turbine hniav siv 3D luam ntawv, uas, ntxiv rau cov txiaj ntsig ntawm ib puag ncig thiab kev lag luam, tso cai rau cov neeg tsim khoom sai sai tsim cov hniav nrog ntau qhov nyuaj thiab lub zog-tsim geometries.Tab sis kev siv zog rau 3D luam turbine hniav tseem tsis tau kov yeej ib qho teeb meem loj: nkag.
Nyob rau hauv metallurgy, creep yog to taub raws li ib tug nyiam ntawm ib tug hlau mus irreversibly deform nyob rau hauv tas li mechanical kev nyuaj siab thiab kub siab.Thaum cov kws tshawb fawb tab tom tshawb nrhiav qhov muaj peev xwm ntawm cov tshuab luam ntawv turbine, lawv pom tias cov txheej txheem luam ntawv tsim cov nplej zoo li ntawm kaum mus rau pua pua micrometers - ib qho microstructure uas tshwj xeeb tshaj yog nkag mus.
Zachary Cordero, tus xibfwb ntawm Boeing ntawm aerospace ntawm MIT tau hais tias "Hauv kev xyaum, qhov no txhais tau hais tias cov roj turbine yuav muaj lub neej luv dua lossis qis dua," said Zachary Cordero."Cov no yog cov txiaj ntsig tsis zoo."
Cordero thiab cov npoj yaig tau pom ib txoj hauv kev los txhim kho cov qauv ntawm 3D luam ntawv alloys los ntawm kev ntxiv cov txheej txheem kev kho cua sov ntxiv uas hloov cov nplej zoo ntawm cov ntaub ntawv luam tawm mus rau hauv cov "kem" loj dua cov nplej - lub microstructure muaj zog uas txo cov khoom muaj peev xwm nkag tau.cov khoom siv vim tias "tus ncej" yog ua raws li cov axis ntawm qhov siab tshaj plaws.Txoj hauv kev uas tau teev tseg niaj hnub no hauv Additive Manufacturing paves txoj hauv kev rau kev lag luam 3D luam ntawv ntawm cov roj turbine hniav, cov kws tshawb fawb hais.
"Nyob rau hauv lub neej yav tom ntej, peb cia siab tias cov tuam txhab roj turbine luam tawm lawv cov hniav hauv cov chaw tsim khoom loj thiab tom qab ua tiav lawv siv peb cov kev kho cua sov," Cordero tau hais."3D luam ntawv yuav ua kom cov txheej txheem cua txias tshiab uas tuaj yeem ua kom cov thermal efficiency ntawm turbines, tso cai rau lawv tsim tib lub zog thaum hlawv roj tsawg thiab thaum kawg emissions tsawg carbon dioxide."
Cordero txoj kev tshawb fawb tau sau los ntawm cov kws sau ntawv Dominic Pichi, Christopher Carter, thiab Andres Garcia-Jiménez ntawm Massachusetts Institute of Technology, Anugrahapradha Mukundan thiab Marie-Agatha Sharpan ntawm University of Illinois ntawm Urbana-Champaign, thiab Donovan Leonard ntawm O. Ridge National Laboratory.
Pab neeg no txoj kev tshiab yog ib daim ntawv ntawm kev taw qhia recrystallization, kev kho cua sov uas txav cov khoom los ntawm thaj chaw kub ntawm qhov kev tswj hwm tus nqi, fusing ntau lub microscopic nplej ntawm cov khoom mus rau hauv loj, muaj zog, ntau yam muaju.
Directional recrystallization tau tsim dua 80 xyoo dhau los thiab siv rau cov ntaub ntawv deformable.Hauv lawv txoj kev tshawb fawb tshiab, ib pab pawg MIT tau siv cov lus qhia recrystallization rau 3D luam tawm superalloys.
Pab neeg no tau sim cov qauv no ntawm 3D luam tawm nickel-based superalloys, hlau feem ntau cam khwb cia thiab siv hauv cov roj turbines.Hauv kev sim ntau, cov kws tshawb fawb tau tso 3D-luam cov qauv ntawm cov pas nrig zoo li superalloys hauv chav dej kub da dej ncaj qha hauv qab lub kauj induction.Lawv maj mam rub txhua tus pas nrig tawm ntawm cov dej thiab dhau los ntawm ib lub kauj ntawm qhov sib txawv ntawm qhov sib txawv, ua kom sov cov pas nrig kom kub li ntawm 1200 txog 1245 degrees Celsius.
Lawv pom tias rub tus pas nrig ntawm ib qho kev ceev (2.5 millimeters ib teev) thiab ntawm qhov kub thiab txias (1235 degrees Celsius) tsim kom muaj qhov kub thiab txias gradient uas ua rau muaj kev hloov pauv hauv cov nplua-grained microstructure ntawm cov ntawv luam tawm.
Cordero piav qhia tias "Cov khoom siv pib ua cov khoom me me nrog qhov tsis xws luag hu ua dislocations, zoo li tawg spaghetti," Cordero piav qhia.“Thaum koj ua kom sov cov khoom, cov kev tsis zoo no ploj mus thiab rov tsim kho dua, thiab cov nplej tuaj yeem loj tuaj.cov nplej los ntawm kev nqus cov khoom tsis zoo thiab cov nplej me me - cov txheej txheem hu ua recrystallization. "
Tom qab txias cov cua kub kho cov pas nrig, cov kws tshawb fawb tau tshuaj xyuas lawv cov microstructure siv optical thiab electron microscopes thiab pom tias cov imprinted microscopic nplej ntawm cov khoom tau hloov los ntawm "columnar" nplej, los yog ntev, siv lead ua zoo li thaj chaw uas loj dua li qub. nplej..
Dominic Peach tau hais tias "Peb tau hloov kho tag nrho,""Peb qhia tau tias peb tuaj yeem ua kom cov qoob loo loj tuaj los ntawm ntau qhov kev txiav txim ntawm qhov loj los tsim cov qoob loo loj, uas yuav tsum tau ua raws li kev txhim kho tseem ceeb hauv cov khoom creep."
Pab neeg no tseem qhia tau hais tias lawv tuaj yeem tswj tau tus nqi rub thiab qhov kub ntawm cov qauv pas nrig kom zoo kho cov qoob loo loj hlob ntawm cov khoom, tsim cov cheeb tsam ntawm cov qoob loo tshwj xeeb thiab kev taw qhia.Qhov kev tswj hwm qib no tuaj yeem tso cai rau cov tuam txhab luam tawm cov tshuab turbine nrog rau qhov chaw tshwj xeeb microstructures uas tuaj yeem hloov kho rau cov haujlwm tshwj xeeb, Cordero hais.
Cordero npaj yuav kuaj cov kev kho cua sov ntawm 3D luam tawm qhov chaw ze rau ntawm lub tshuab cua tshuab.Pab neeg no tseem tab tom nrhiav rau hauv txoj hauv kev txhawm rau txhawm rau txhawm rau lub zog tensile nrog rau kev sim cov creep tsis kam ntawm cov txheej txheem kho cua sov.Tom qab ntawd lawv xav tias kev kho cua sov tuaj yeem ua kom muaj txiaj ntsig zoo ntawm 3D luam ntawv los tsim cov khoom lag luam qib turbine nrog ntau cov duab thiab cov qauv.
"Cov hniav thiab cov hniav geometry tshiab yuav ua rau cov av-raws li cov roj turbines thiab, thaum kawg, cov tshuab dav hlau siv zog ntau dua," Cordero hais."Los ntawm qhov kev xav hauv paus, qhov no tuaj yeem txo qis CO2 emissions los ntawm kev txhim kho cov txiaj ntsig ntawm cov khoom siv no."
Post lub sij hawm: Nov-15-2022
