Lub Titanium Alloy tau ua kom zoo los ntawm kev kho Hydrogen

Cov titanium alloy tau ua kom zoo los ntawm kev kho hydrogen

Ultrafine titanium alloy muaj cov txiaj ntsig zoo, nws lub zog kub hauv chav tuaj yeem txhim kho rau qee qhov, thiab nws muaj qhov zoo elongation ntawm qhov kub thiab txias. Grain refinement feem ntau yog tau los ntawm txoj kev loj deformation, xws li sib npaug ntawm txoj kab uas hla lub kaum sab xis extrusion, siab torsion, multi-axis forging thiab cumulative yob vuam. Tsis tas li ntawd, titanium alloy kuj tuaj yeem kho hydrogen.

Xyoo 1970, lub koom haum tshawb fawb dav hlau hauv Moscow, kawm txog cov txiaj ntsig ntawm hydrogen ntawm cov khoom ntawm titanium alloy ua, muab tso rau pem hauv ntej lub tswv yim ntawm "hydrogen plasticizing", raws li ib ntus alloying caij rau hydrogen, los ntawm hydrogen permeability thiab eutectoid decomposition, nqus tsev vacuum. dua li hydrogen, thiab siv hydrogen induced plasticity, hydrogen induced theem hloov, thiab reversible hydrogen nyob rau hauv titanium alloying nyhuv, txhim kho cov kev ua tau zoo, refine microstructure ntawm cov ntaub ntawv.

Kev kho hydrogen tuaj yeem siv los kho cov qauv nplej ntawm titanium alloy castings thiab forgings thiab txhim kho lawv cov khoom siv kho tshuab.Nws tau raug tshaj tawm tias lub microstructure ntawm TiAl alloy tuaj yeem ua kom zoo los ntawm kev kho hydrogen, thiab lub zog compression thiab lub zog ntawm TiAl alloy tuaj yeem txhim kho tau zoo.Hauv kev xyaum, kev kho hydrogen thev naus laus zis feem ntau tuaj yeem ua ke nrog kev kho cua sov tom qab thiab kev kho thermal deformation kom tau txais cov qauv zoo heev.Qee cov kev tshawb fawb tau pom tias thaum hydrogenated titanium alloy yog deformed ntawm qhov kub thiab txias, equiaxed nplua nplej nrog cov nplej loj ntawm li 1μm tuaj yeem tsim tau, thiab txawm tias cov nplej nano-scale tuaj yeem tsim.Txoj kev tshawb no ntawm Ti-6.3Al-3.5Mo-1.7Zr (feem pua ​​​​, pawg pawg) alloy qhia tau hais tias cov hydrogen feem yog 14 feem pua ​​~ 16 feem pua ​​​​hauv kev kho hydrogen, qhov kub thiab txias deformation yog txo mus rau 550 degree, thiab los ntawm cov txheej txheem deformation thiab cov txheej txheem decomposition ntawm metastable theem, nanocrystalline grain loj ntawm 40nm yog thaum kawg tau.Muab piv rau engineering stress-strain curves ntawm Ti-6AL-4V alloy nrog ntau qhov ntau thiab tsawg, nws tuaj yeem pom tau tias cov khoom siv zoo tshaj plaws ua rau muaj zog yield thiab elongation piv nrog cov nplej ntxhib lossis dav. hmoov nplej zoo.

Los ntawm kev tso cai rau cov titanium alloy kom nqus tau ntau cov hydrogen atoms thiab los ntawm kev tso cai rau cov hydrogen atoms kom desorption hauv lub tshuab nqus tsev ntawm qhov kub thiab txias, txheej txheem hu ua ADH-kev kho.Nrog rau kev ntxiv titanium alloy, kev kho mob los ntawm pyh suav nrog peb txheej txheem hauv qab no: (1) los ntawm hydrogen nqus hauv hydrogen cua;(2) Martensite transformation thiab thermal ua nws thiaj li ua rau dispersion ntawm hydride nag lossis daus;(3) Kev kho desorption kawg thiab recrystallization los ntawm hydrophyzation.Nws tau tshaj tawm tias los ntawm kev kho Ti{{0}}AL-4V alloy nrog hydrogen ntxiv, cov alloy adsorbed 0.5 feem pua ​​​​los ntawm hydrogen ntxiv thiab desorbed ntawm 873K, pom ultra-fine isoaxed crystal qauv nrog loj angular grain ciam teb thiab grain loj nyob rau hauv thaj tsam ntawm 300 ~ 500nm.Cov txiaj ntsig tau pom tias -phase cov ntsiab lus hauv matrix tau nce los ntawm txoj kev kho prophyton.Tensile xeem qhia tau hais tias lub zog tawm los ntawm alloy nce nyob rau hauv chav tsev kub, thiab qhov siab tshaj plaws elongation mus txog 9000 feem pua ​​​​ntawm 1123K.

Cov txiaj ntsig kev sim qhia tau hais tias lub superplastic elongation thiab lwm yam khoom siv ntawm cov hlau alloy nce pom tseeb nrog qhov txo qis ntawm cov nplej loj.

Txawm hais tias txoj kev kho hydrogen qhia tau hais tias muaj peev xwm zoo rau kev kho cov titanium alloys, piv nrog rau lwm txoj kev, txoj kev kho hydrogen muaj tus nqi siab dua, thiab rau cov qauv loj, txoj kev kho kuj muaj teeb meem ntawm kev faib tsis sib xws ntawm hydrogen thiab cov khoom siv siab. tej yam kev mob, uas yuav tsum tau kawm ntxiv kom daws tau.