Ib leeg Crystal Turbine Hniav

Directional crystallization blades tshem tawm transverse grain ciam teb, uas yog rhiab rau voids thiab kab nrib pleb, thiaj li hais tias tag nrho cov grain ciam teb yog parallel mus rau cov kev taw qhia ntawm kev nyuaj siab axis, yog li txhim kho cov alloy lub serviceability. Ib leeg siv lead ua hniav tshem tawm tag nrho cov qoob loo ciam teb, tsis tas yuav ntxiv cov ciam teb ntxiv dag zog rau cov ntsiab lus, kom qhov kub ntawm qhov pib melting ntawm cov hlau yog qhov siab, yog li ua kom lub zog kub ntawm cov hlau, thiab ntxiv dag zog rau tag nrho cov kev ua tau zoo. lub alloy. Ib leeg siv lead ua hniav tag nrho cov casting muaj ib tug grain muaj pes tsawg leeg ntawm casting ntawm kub alloys. Qhov no yog ua raws li cov kev taw qhia solidification casting siab kub alloys, kom ntxiv dag zog lub zog ntawm alloy thiab kev siv kub ntawm ib txoj kev.

Ib leeg siv lead ua hniav castings ntawm lub koom haum zoo tagnrho yog cov nplooj hauv paus, nplooj lub cev thiab nplooj nplooj, yog tsim los ntawm cov tsis xws luag-dawb multi-theem ib leeg siv lead ua. Crystal orientation yuav tsum yog 〈001 〉 kev taw qhia, thiab nrog cov hniav lub ntsiab kev ntxhov siab axis kev taw qhia ntawm qhov sib txawv yuav tsum tsis txhob siab tshaj 10 degrees. Ib leeg siv lead ua castings tuaj yeem npaj nrog cov khoom siv tib yam thiab cov txheej txheem ntawm kev taw qhia solidification, thiab cov kev taw qhia solidification castings txawv tsuas yog nyob rau hauv cov dej-txias chassis ntawm sab sauv ntawm qhov sib ntxiv ntawm cov siv lead ua selector los yog siv lead ua me me, thiaj li tswj tau cov siv lead ua ib leeg. nyob rau hauv lub casting.

Cov keeb kwm luv luv ntawm thawj zaug ib leeg siv lead ua casting high-temperature alloys siv zoo tib yam casting high-temperature alloy muaj pes tsawg leeg, nyob rau hauv cov ntaub ntawv no, ib leeg siv lead ua casting high-temperature alloys thiab directional solidification casting high-temperature alloys, ntxiv rau kev txhim kho transverse zog thiab plasticity, thiab lwm yam khoom thiab tsis muaj kev txhim kho tseem ceeb. Thaum kawg ntawm xyoo 1970, qhov tshwm sim ntawm kev tshem tawm ntawm cov qoob loo ntawm cov ciaj ciam muaj zog (saib qhov kub-kub alloys ntxiv dag zog los ntawm cov qoob loo ciam teb ntawm cov) cov ntsiab lus ntawm ib leeg-crystal casting high-temperature alloys, xws li US PwAl480, NASAIRl00.

carbon, boron, zirconium, hafnium thiab lwm yam qoob loo ntxiv dag zog cov ntsiab lus tshem tawm los txhim kho qhov pib melting kub ntawm cov hlau, yog li tso cai rau txhim kho cov khoom siv kho mob kub, kom tau txais qhov zoo dua, ntau dua Y 'theem (saib cov ntaub ntawv kub kub intermetallic tebchaw theem), yog li ntawd cov alloy lub peev xwm kom tau ib tug fuller ua si.Tom qab ntau tshaj 20 xyoo ntawm txoj kev loj hlob, ntau tshaj 20 hom ib leeg-crystal cam khwb cia high-temperature alloys tau tshwm sim. Cov hlau no tuaj yeem muab faib ua peb tiam: thawj tiam rau PwAl480 ua tus neeg sawv cev ntawm nws qhov kub thiab txias muaj peev xwm tshaj qhov zoo tshaj plaws kev taw qhia solidification casting high-temperature alloy PwAl422 muaj 25 degree kom zoo dua; tiam thib ob rau PwAl484 ua tus sawv cev ntawm thawj tiam tshaj li thawj tiam thiab txhim kho los ntawm 25 degree; yog tsim los yog tiam thib peb ntawm ib leeg-crystal alloys.