Zotsatira za chithandizo cha cryogenic pa microstructure ya simenti ya carbide

Njira zosiyanasiyana za cryogenic zimayambitsa kusintha kwa zinthu zasimenti carbide, ndipo kusintha kwa katundu kumagwirizana kwambiri ndi kusintha kwa microstructure yake.Choncho, m'pofunika kusanthulanso mphamvu ya chithandizo cha cryogenic pa microstructure ya simenti ya carbide.

The microstructure wa WC-Co cemented carbide ndi motere: gawo - WC (gawo lolimba);β gawo - Co (gawo lomanga);y gawo - (TaC, TiC, NbC, WC) equicubic lattice mix carbides;eta phase-decarburized phase (CoW, C, Co. W. C).Gill ndi al.adapereka chithunzi chojambula cha magawo a ndi β, monga momwe tawonetsera pa Chithunzi 6. Pakati pawo, α gawo-WC (gawo lolimba) limatenga gawo lalikulu musimenti carbide zinthumu mawonekedwe a mafupa olimba, pamene β phase-Co (binder phase) imagwirizana kwambiri ndi tungsten carbide (WC) ngati grid.

Pamene simenti carbide utakhazikika pambuyo sintering, popeza kuchuluka kwa W ndi C kusungunuka mu Co, ndi kutentha kwapamwamba gawo α-Co kutentha firiji akadalipo stably.Kutentha kukapitirizabe kuchepa, kusintha kwa gawo la martensitic kuchoka pankhope ya cubic α-Co kupita kufupi ndi hexagonal ε-Co kumachitika mu gawo lolumikizana -Co.Tingaone kuti pamene kutentha kusintha, pali kusintha microstructure wasimenti carbide, zomwe zimapereka mwayi wa chithandizo cha cryogenic kulimbikitsa kusintha kwa gawosimenti carbide.Maphunziro ambiri ayang'ana pa kusintha kwa microstructure yasimenti carbideisanayambe komanso itatha chithandizo cha cryogenic ndikufufuza njira yosinthika ya microscopic pamene katundu wa macroscopic amasintha.