Izinqubo ezihlukene ze-cryogenic zibangela izinguquko ezakhiweni zei-carbide enosimende, futhi izinguquko ezakhiweni zihlobene eduze nokuvela kwe-microstructure yayo.Ngakho-ke, kuyadingeka ukuqhubeka nokuhlaziya umthelela wokwelashwa kwe-cryogenic ku-microstructure ye-carbide enosimende.
I-microstructure evamile ye-WC-Co cemented carbide imi kanje: isigaba - i-WC (isigaba esinzima);β isigaba - Co (isigaba sokuhlanganisa);y isigaba - (i-TaC, i-TiC, i-NbC, i-WC) i-equicubic lattice exubile ama-carbides;eta isigaba-decarburized phase (CoW, C, Co. W. C).Gill et al.wanikeza umdwebo wohlelo lwezigaba u-a no-β, njengoba kukhonjisiwe kuMfanekiso 6. Phakathi kwazo, u-α isigaba-WC (isigaba esinzima) sithatha ingxenye enkulu ku-izinto ze-carbide zikasimendengesimo sohlaka lwamathambo oluqinile, kuyilapho i-β phase-Co (isigaba se-binder) ixhunywe eduze ne-tungsten carbide (WC) njengegridi.
Uma i-carbide enosimende ipholiswa ngemva kokucwiliswa, njengoba inani elikhulu lika-W no-C lichithwa ku-Co, isigaba sezinga lokushisa eliphezulu esingu-α-Co kuzinga lokushisa legumbi sisekhona ngokuzinzile.Uma izinga lokushisa liqhubeka nokwehla, ukuguqulwa kwesigaba se-martensitic ukusuka ku-cubic α-Co egxile ebusweni ukuya ku-ε-Co egcwele ama-hexagonal kwenzeka esigabeni sokubopha -Co.Kungabonakala ukuthi lapho izinga lokushisa lishintsha, kunezinguquko ku-microstructure yei-carbide enosimende, okunikeza ithuba lokwelashwa kwe-cryogenic ukukhuthaza ukuguqulwa kwesigabai-carbide enosimende.Ucwaningo oluningi lugxile ezinguqukweni ze-microstructure yei-carbide enosimendengaphambi nangemva kokwelashwa kwe-cryogenic futhi yahlola indlela yokuziphendukela kwe-microscopic lapho izakhiwo ze-macroscopic zishintsha.
Isikhathi sokuthumela: Mar-06-2024
