Huwandu hwekristaro nuclei hunoderedzwa kana iyo eutectic crystallization yesimbi yakanyungudutswa muchoto chinonyunguduka.

Mukunyunguduka kwecupola, nguva kubva pakunyunguduka kwechaji kusvika pakubuda kwesimbi yakanyungudutswa kubva muchoto ipfupi kwazvo, anenge maminetsi gumi. Pakunyungudika mu an kudonhedzwa kunyorera vira, zvinotora ingangoita 1 awa kubva pakutanga kwekuchaja kusvika pakubata simbi, uye zvakare ine yakasarudzika inosimudzira mhedzisiro yekupisa induction, iyo inoderedza zvakanyanya zvinhu zviri musimbi yakanyungudutswa inogona kushandiswa seyokunze nucleus yegraphite. panguva eutectic crystallization. . Semuyenzaniso, SiO2, iyo inogona kushandiswa seyekune imwe kristaro nucleus, inogona kuita zviri nyore nekabhoni musimbi yakakandwa uye inonyangarika kana tembiricha yakakwira zvakanyanya uye paine zvinokonzeresa:

SiO2＋O2→Si＋2CO↑

Naizvozvo, kana uchinyungudutsa grey cast iron muchoto chekunyungudutsa, kutarisisa kwakanyanya kunofanirwa kubhadharwa kune inoculation kurapwa. Huwandu hweinoculant hunofanira kunge hushoma kudarika huri mucupola smelting. Zvakanakisisa kuita pre-incubation (pre-inoculation) muchoto isati yabudiswa. Kuvandudza iyo nucleation mamiriro e cast iron eutectic crystallization.