siab carbon ferro silicon
Cov kua cam khwb cia hlau muaj silicon, uas txo cov solubility ntawm carbon. Qhov siab dua cov ntsiab lus ntawm silicon hauv cov hlau molten thiab qis dua cov ntsiab lus carbon, cov pa roj carbon ntau yuav raug nyem tawm.
silicon ferro
Nws tsis yog qhov nyuaj rau kev nkag siab los ntawm cov kab kos hlau-carbon theem: thaum cov hlau molten yog cov muaj pes tsawg leeg hypereutectic, cov ntsiab lus silicon siab. Thaum lub sij hawm solidification txheej txheem, ntau carbon precipitates nyob rau hauv daim ntawv ntawm cov thawj graphite kom txog rau thaum cov hlau molten tshuav mus txog eutectic muaj pes tsawg leeg. Eutectic transformation tshwm sim tom qab; Thaum cov hlau molten yog ib qho hypoeutectic muaj pes tsawg leeg, silicon yog enriched nyob rau hauv thawj austenite thaum lub sij hawm solidification txheej txheem. Thaum lub sij hawm eutectic transformation, silicon yog enriched nyob rau hauv thaum ntxov crystallized eutectic austenite, inhibiting lub synthesis ntawm cementite los ntawm carbon thiab hlau, txhim khu lub diffusion tus nqi ntawm carbon nyob rau hauv austenite, thiab txhawb cov nag lossis daus ntawm carbon nyob rau hauv daim ntawv ntawm eutectic graphite; Thaum lub sij hawm hloov pauv eutectoid, cov khoom siv ntawm silicon hauv austenite tseem inhibits qhov tsim ntawm cementite ntawm cov pa roj carbon thiab hlau, txhim kho cov pa roj carbon diffusion hauv austenite, thiab txhawb cov nag lossis daus ntawm carbon nyob rau hauv daim ntawv ntawm eutectoid graphite.
Ferro hlau nplaum
Hauv grey cam khwb cia hlau, ductile hlau, vermicular graphite cam khwb cia hlau thiab dub core malleable hlau, carbon thiab silicon yog cov ntsiab lus tseem ceeb uas cuam tshuam rau cov duab thiab ntau ntawm graphite. Nws yog dawb lub plawv malleable cam khwb cia hlau uas yeej tsis muaj graphite. Thaum lub sij hawm decarburization annealing txheej txheem, silicon txhawb lub diffusion ntawm carbon nyob rau hauv austenite, uas kuj plays ib tug tseem ceeb luag hauj lwm nyob rau hauv lub decarburization ntawm no malleable cam khwb cia hlau.
Tsis tas li ntawd, cov pa oxygen thiab nitrogen hauv cam khwb cia hlau muaj cov nyhuv stabilizing carbides. Cov silicon muaj nyob rau hauv cam khwb cia hlau yuav txo tau cov pa oxygen thiab nitrogen cov ntsiab lus nyob rau hauv nws, uas indirectly txhim khu cov nyhuv ntawm silicon ntawm graphitization.
