Kev cuam tshuam ntawm titanium hnav-resistant phaj ntawm clogging ntawm submerged nozzle
Vim qhov sib ntxiv ntawm Ti, titanium hnav-resistant phaj tau kho cov intergranular atoms xws li C thiab N, yog li nws muaj zoo dua intergranular corrosion kuj, thiab yog dav siv nyob rau hauv kev lag luam tsheb. Txawm li cas los xij, qhov sib ntxiv ntawm titanium kuj tseem yuav ua rau muaj kev cuam tshuam tsis zoo rau cov txheej txheem tsim khoom thiab cov khoom zoo. Cov nitride thiab oxide ntawm titanium yuav ua rau muaj kev cuam tshuam loj ntawm kev sib txuas lossis hlau txuas rau ntawm phab ntsa sab hauv ntawm lub tshuab nqus tsev ntawm cov pwm nruam nruam, uas ua rau muaj qhov thaiv ntawm lub nozzle, uas muaj kev cuam tshuam loj rau kev tsim khoom ntawm ntau lub cub tawg nruam casting. nyob rau hauv tus txheej txheem ntawm hnav-resistant phaj nruam casting, thiab thaum kawg cuam tshuam rau qhov zoo ntawm casting billet thiab hlau.
Los ntawm txoj kev ntawm scanning electron microscopy (SEM) thiab FactSage thermodynamic software, cov kws tshawb fawb tau kawm txog qhov ua rau lub immersion nozzle blockage nyob rau hauv lub nruam casting txheej txheem ntawm AISI321 hnav-resistant phaj uas muaj titanium. Cov txiaj ntsig kev sim qhia tau tias cov dej ntsaws dej feem ntau muab faib ua peb txheej. Thawj txheej yog txheej txheej steel txias rau saum npoo ntawm cov dej ntsaws. Lub solidification ntawm cov hlau yog tshwm sim los ntawm oxidation ntawm TiN los yog txo ntawm TiO2 los ntawm Ti nyob rau hauv cov hlau mus rau SiO2 nyob rau hauv cov hlau. Qhov thib ob txheej yog dendritic thaiv txheej ze rau saum npoo ntawm cov hlau txias, uas yog tsim los ntawm CAo.Tio2-MGO.al2o3 complex inclusions nplua nuj nyob rau hauv CaO.TiO2, uas yog feem ntau tshwm sim los ntawm kev nruam tsub zuj zuj ntawm suav nrog hauv cov kua hlau. Cov txheej thib peb yog ntau cov txheej txheem txias txias nyob ze ntawm cov kua hlau sab, uas yog tsim los ntawm TiN uas muaj MgO.Al2O3 core thiab txias steel. Vim tias MgO.Al2O3 nyob rau hauv cov kua hlau induces TiN nag lossis daus, thiab yog li txhawb cov solidification ntawm cov kua hlau, composite TiN inclusion yog tsim.
Los ntawm kev tshawb nrhiav cov laj thawj ntawm kev tsim cov khib nyiab hauv cov phaj hnav-tiv taus, cov kev ntsuas hauv qab no tuaj yeem siv los daws cov teeb meem ntawm cov dej nozzle thaiv: txo cov ntsiab lus ntawm carbon thiab nitrogen hauv cov phaj hnav-resistant, thiab txo cov nqi ntawm titanium ntxiv; Txo cov ntsiab lus ntawm SiO2 nyob rau hauv dej inlet resistant khoom; Txhim kho kev huv ntawm cov hlau tsis huv, tshwj xeeb tshaj yog tshem tawm CaO.TiO2 suav nrog; Thaum lub sij hawm refining txheej txheem, CaO.TiO2 inclusions tau denatured los ntawm kev kho mob ntawm txhuas thiab calcium nyob rau hauv cov kua hlau, thiab cov uas tsis muaj melting point kua inclusions tau tsim.
