Ultrasonic hlau yaj cov kev kho mobyog siv cov txiaj ntsig cavitation ntawm ultrasonic hauv molten kua, tuaj yeem txiav cov dendrite uas puas lawm, cuam tshuam rau lub zog ua ntej, ntxiv cov nplawm diffusion, homogenize microstructure, nce lub zog tensile ntawm cov ntaub ntawv hlau thiab txhim kho lub hlau tawv. Lub noob nplej me me thiab thaj chaw thaj tsam loj heev, uas tuaj yeem tiv thaiv kev cuam tshuam thiab cuam tshuam rau qhov chaw qis, qhov ntawd yog hais, ntau lub zog xav tau los ua qhov khoom tawg. Ua kom tiav cov nplej loj dua, qhov me me dendrite spacing, qhov ntau dua qhov tawm los muaj zog thiab qhov ua tau zoo.
Qhov zoo tshaj plaws microstructure ntawm lub ingot yog tias muaj cov xaim hluav taws xob zoo thiab zoo equiaxed ntawm tag nrho cov ntoo khaub lig ntu ntawm lub ingot, uas yog vim muaj qhov me me anisotropy ntawm equiaxed nplej, uniform deformation, zoo heev thiab zoo plasticity thaum lub sij hawm ua, uas yog zoo rau casting thiab tom qab ua yas. Txhawm rau kom tau txais cov qauv zoo no, txoj kev ua haujlwm tseem ceeb tshaj plaws yog siv cov khoom siv ultrasonic hlau yaj ua kom zoo dua ntawm cov yaj.
Kev ua haujlwm ntawm ultrasonic yaj kev kho kab mob
Tshem tawm qhov tsis zoo: nws yog qhov nyuaj heev kom ntab cov me me hauv cov hlau tsis huv, thiab nws yuav yooj yim rau ntab tsuas yog thaum lawv sib sau ua ke. Ultrasonic sawv nthwv dej tuaj yeem ua rau cov hmoov suav daws hauv kev daws teeb meem thiab kev ua kom tiav los ntawm cov khoom siv ultrasonic yaj.
Ultrasonic degassing: ultrasonic muaj qhov cuam tshuam zoo ntawm kev tshem tawm cov roj ntawm molten hlau. Ultrasonic elastic kev co tuaj yeem ua rau degass alloy hauv ob peb feeb. Thaum ultrasonic kev co nkag tau rau hauv cov hlau tsis muaj hlau, cavitation pom, uas yog tshwm sim los ntawm qhov tawg ntawm cov kev txuas ntxiv ntawm cov kua theem, thiab cov roj yaj hauv cov kua hlau yuav muaj ntau nyob hauv nws. Lub elastic kev co ntawm ultrasonic yoj ua rau cov tub ntxhais npuas kom loj hlob mus txog thaum nws tuaj yeem tawm los ntawm molten hlau ntseeg nkaws.
Txhim kho qhov zoo ntawm kev ua tiav: cov cuab yeej ua kua hlau ultrasonic tuaj yeem siv rau hauv pwm txhawm rau txhim kho qhov chaw zoo ntawm cov pob zeb. Kev vibration ultrasonic tuaj yeem siv rau billet, tawg thiab slab, thiab nws tsis yog qhov yuav tsum xaub qhov tsis zoo thaum ultrasonic kev siv. Thaum nrum cov square me me thiab tawg, saum npoo ntawm billet tuaj yeem tau txais los ntawm ultrasonic kev co.
Grain ua kom zoo: thaum ultrasonic kev co solidification txheej txheem yog siv los tsim castings, ultrasonic yoj yuav ua lub suab zoo thiab tsis zoo hloov lub suab siab thiab daim ntawv dav hlau. Lub caij no, acoustic thiab micro acoustic txaus yuav tsim vim cov nyhuv nonlinear, thaum ultrasonic cavitation yuav tsim high-speed micro dav hlau ntawm cov khoom thiab kua interface. Cavitation effect nyob rau hauv ultrasonic kua tuaj yeem txiav tawm qhov tawg dendrites, muaj feem cuam tshuam rau hauv lub solidification pem hauv ntej, nce qhov sib txawv diffusion, thiab tuaj yeem ntxuav cov qauv, ua kom zoo dua cov nplej, thiab homogenize tus qauv. Ntxiv rau qhov kev txiav txim siab tshuab los ntawm kev co, lwm lub luag haujlwm tseem ceeb ntawm ultrasonic kev co solidification yog txhawm rau txhim kho qhov zoo supercooling degree ntawm cov kua hlau, txo qhov tseem ceeb nucleation, nce nucleation tus nqi thiab rov qab kho cov nplej.