Dab tsi yog qhov tsis zoo ntawm Inconel 718?
Inconel 718 yog ib qho kev ua haujlwm siab nickel-hlau-chromium-raws li superalloy tsim los ntawm Inconel's Eiselstein thaum xyoo 1950s los siv rau hauv cov roj turbine xyaw. Nws ua rau muaj txiaj ntsig zoo los ua kom tau raws li qhov yuav tsum tau ua ntawm cov roj turbine siab heev. Nws yog dav siv nyob rau hauv aerospace teb vim nws zoo weldability thiab superior mechanical zog tshaj lwm qib ntawm superalloys. Lub siab thermal zog ntawm Inconel 718 alloy yog ua tiav los ntawm nag lossis daus ntawm prime-[Ni3Ti, Ni3Al)] thiab biprime-[Ni3Nb] theem. General Electric siv 34 feem pua Inconel 718 alloy nyob rau hauv lub Boeing 787 lub CF6 cav, uas yog siv los ua aerospace cav Cheebtsam. Nws yog siv nyob rau hauv kub qhov chaw ntawm foob pob hluav taws thiab roj turbines, xws li cov hniav, disks thiab casings nyob rau hauv lub high-pressure cheeb tsam ntawm compressors thiab disks, raws li zoo raws li ib co hniav nyob rau hauv turbine qhov chaw nrog high-temperature zog, zoo heev creep thiab kev nyuaj siab rupture zog. . , zoo kub corrosion kuj thiab oxidation kuj yog lub ntsiab yuav tsum tau. Nws suav nrog ob txoj hauv kev ntxiv dag zog: kev daws teeb meem ntxiv zog (Fe, Cr, Mo, Nb atoms hloov Ni hauv Ni matrix) thiab nag lossis daus ntxiv ntawm ' thiab ″ precipitates. Ntawm qhov kub thiab txias ze rau 650 degree, Nb ua ke nrog Ni Forms ″ theem (Ni3Nb), muab cov khoom zoo heev ntawm qhov kub thiab txias.
Kev txhim kho txuas ntxiv hauv kev ua tau zoo, kev ua haujlwm ntawm thaj chaw thiab txo kev txij nkawm ntawm cov roj turbine xyaw yuav tsum tau siv dav hauv Inconel 718 alloy. Lawv tuaj yeem tiv taus kev ntxhov siab ntau dua ntawm qhov kub siab txog 650 degree rau lub sijhawm ntev, ua kom pom tias lawv muaj peev xwm siv tau rau hauv kev siv roj turbine tshuab thev naus laus zis. Tom qab xyoo 1950, lub hnub nyoog ntawm cov tshuab dav hlau thiab foob pob hluav taws tau pib, thiab nws tau ua lub luag haujlwm tseem ceeb hauv kev txhim kho cov tshuab hluav taws xob siab. Yog tsis muaj nickel-based superalloys, lub dav hlau yuav ya nrog lub zog tsawg dua thiab qeeb qeeb. Txoj hauv kev zoo tshaj plaws los ua kom nrawm nrawm ntawm aeroengine yog ua kom nws qhov kub thiab txias. Nws yog txwv los ntawm qhov kub tsis kam ntawm cov hlau siv hauv aerospace engine Cheebtsam. Nws yuav tsum nyuaj thiab tiv taus corrosion, oxidation thiab deformation ntawm qhov kub thiab txias. Cov ntaub ntawv feem ntau muaj kev nrawm nrawm ntawm qhov kub thiab txias 30-40% ntawm lawv qhov melting point. Piv txwv li, titanium alloys nkag mus nrawm dua 360 degree. Inconel 718 superalloy muaj qhov nkag tau zoo heev thiab tuaj yeem siv tau ntawm qhov kub txog li 860 degree, uas yog 70% siab tshaj nws qhov melting point (Tm=1430} degree ). Ob xyoo dhau los, roj turbine cav propulsion tau nce 60 feem pua thaum siv roj tau txo los ntawm 20 feem pua. Nws txuas cov kev txwv kev ua haujlwm ntawm superalloys mus rau 1300 degree, pab txhawb rau lub dav hlau muaj zog.
