Ultrasonic kev ntawm Melts hlau

Ultrasonic kev ntawm Melts hlau

Lub hwj huam ultrasound hauv cov pa hlau hlau thiab cov phom pom muaj ntau yam txiaj ntsim xws li kev teeb tsa xws li kev teeb tsa, kev ua kom zoo nkauj, thiab kev pom zoo.

Ultrasonic txhawb nqa cov non-dendritic solidification hauv cov kua thiab cov khoom ib nrab. Sonication muaj ntau cov kev pab cuam rau lub microstructural kev ua kom pom ntawm dendritic cov nplej thiab thawj cov khoom sib txuas ua ke.

Ntxiv mus, hwj huam ultrasound tuaj yeem siv lub hom phiaj los txo cov hlau porosity los yog tsim cov khoom tsim tawm.

Xeem, tab sis tsis kawg, hwj huam ultrasound pab txoj kev zoo ntawm castings.

Ultrasonic Solidification

Kev tsim ntawm cov khoom tsis muaj dendritic thaum lub sij hawm sib zog ntawm cov hlau yaj tuaj yeem ua rau cov khoom siv xws li lub zog, kev lag luam, kev muaj zog, thiab / los yog kev mob.

Ultrasonically kho grain nucleation: Acoustic cavitation thiab nws khaus shear rog nce lub nucleation qhov chaw thiab cov nuclei nyob hauv yaj. Ultrasonic kho cov melts tshwm sim nyob rau hauv lub heterogeneous nucleation thiab lub fragmentation ntawm dendrites, thiaj li hais tias qhov kawg khoom qhia tau hais tias ib tug higer grain ntxhib.

Ultrasonic cavitation ua rau lub siab txawm tias tsis yog xim hlau uas tsis yog xim hlau hauv cov tawv nqaij. Cov impurities tig mus rau hauv qhov chaw nucleation, uas yog cov ntsiab lus pib ntawm solidification. Vim hais tias cov ntsiab lus ntawm cov ntsiab lus nucleation yog ua ntej ntawm lub hauv paus, qhov kev loj hlob ntawm cov dendritic lug tsis tshwm sim. Macrostructure ntawm Ti alloy tom qab kev kho ultrasonic Dendrite fragmentation: Cov yaj ntawm cov dendrites feem ntau pib ntawm lub hauv paus vim huab cua nce siab thiab kev sib cais. UST ua rau muaj kev sib nkag siab (tshav kub los ntawm cov lus tsa suab ntawm huab cua) thiab poob siab tsis nyob hauv yaj, yog li ntawd cov dendrites yog fragmented.

Convection yuav txhawb dendrite fragmentation vim huab kub hauv zos li zoo li muaj pes tsawg leeg variations thiab txhawb diffusion ntawm solute. Cov cavitation poob siab tsis pab cov tawg ntawm cov melting keeb kwm.