Muaj dej ntau nyob rau saum ntuj, thiab tsis muaj hmoov av tuaj yeem tsim los nag. Zoo sib xws, txawm hais tias muaj graphite thiab impurities raws li cov siv lead ua tseem ceeb hauv cov hlau molten, thiaj li txhim kho cov siv lead ua hom thiab graphite morphology, qhov tshiab inoculant tau dhau los ua lub siab-grey cam khwb cia hlau, zas hlau, vermicular cam khwb cia hlau, thiab lwm yam. , uas hloov cov qauv hlau, cov khoom siv kho tshuab thiab cov khoom sib ntxiv uas tsis tseem ceeb rau cov khoom siv lub cev.
Lub hauv paus tseem ceeb ntawm cov kua roj zais kua zais yog Si, tom qab los ntawm Ca, Ba, Sr, AJ, Ti, zr, Mn, Cr, B,
C, Bi, Sb, Ce, La, cov ntsiab lus ntawm cov ntsiab lus dua li Si tsuas yog ob peb feem pua, thiab tus nqi ntawm inoculant ntxiv yog 0.5%, yog li tus nqi ntawm cov alloy nkag mus rau hauv cov hlau molten ntau dua li cov nyiaj ntawm alloying rau hauv molten hlau. Nws yog qhov tsawg tshaj li ib lossis ob qho kev txiav txim ntawm qhov ntau, yog li nws nyuaj rau kev soj ntsuam qhov cuam tshuam ntawm inoculation nrog qhov nce ntawm cov tshuaj lom neeg muaj pes tsawg leeg. Qee cov ntsiab lus tsis pom tom qab kev sib txuam ntawm cov cam khwb cia hlau, uas txaus los qhia tias cov khoom no tsis ua lub luag haujlwm hauv kev ua haujlwm intergranular.
Cov ntaub ntawv qhia tau hais tias lub hlau nchuav tau cov kab ntawm O, N thiab H, ntawm cov pa oxygen thiab yaj nitrogen tau cuam tshuam zoo nrog kev siv tsis taus. Oxygen nyob rau hauv molten hlau reacts nrog silicon los tsim silica muaju, uas ua raws li txawv teb chaws siv lead ua los ntawm graphite muaju los txhawb graphitization. Hauv kev tsis sib haum xeeb, ca, Mg, Mn, Al, Ce, thiab La daim sulfides, si, Mg, ca, Al, Ba daim ntawv oxides, thiab si, Al, ca, sr, Ba daim ntawv carbides, thiab si, Al, Ti Zr, ce daim ntawv nitrides, txo ntau cov yaj ntawm cov dej hauv nitrogen, tiv thaiv lub qhov ncauj kom dawb; ce, La thiab Bi, Pb, sb, Te, Raws li, sn tsim intermetallic tebchaw, inhibit qhov tsis zoo ntawm kab kawm cuam tshuam.
Hauv ntej, sulfides, oxides, nitrides, carbides, lub ntiaj teb tsis tshua muaj lub tebchaw, thiab lwm yam hauv cov hlau tsis muaj hlau yog txhua yam khoom hauv cov tub ntxhais graphite. Lub inoculant ntxiv cov hlau hais saum toj saud, thiab nws txoj haujlwm ua haujlwm tau zoo yog los txhim kho lub tshuab thev naus laus zis, lub cev, kev ua thiab lwm yam khoom. Tshiab inoculants thiab inoculation txoj kev yog qhov tseem ceeb txhais tau tias rau niaj hnub casting los txhim kho kev ua tau zoo ntawm cam khwb cia hlau. Hmoov tsis zoo, mus txog rau tam sim no, tseem muaj ntau lub tuam txhab ntawm cov tuam txhab grey cam khwb cia hlau, zas hlau taw, tab sis kuj tseem nyob hauv 0.6-0.8% nce tus naj npawb ntawm 75 # ferrosilicon raws li lub hauv tshuaj lom neeg.
