Daim ntawv thov ntawm Niobium Steel

Ntawm ntau yam microalloying ntsiab nyob rau hauv steel, seem niobium yog qhov zoo tshaj plaws microalloying keeb. Lub luag haujlwm ntawm niobium yog qhov zoo heev uas muaj ntau ntawm niobium atoms hauv cov hlau atom tuaj yeem siv los ua kom muaj kev txhim kho hauv cov khoom ntawm cov hlau. Qhov tseeb qhov sib ntxiv ntawm {{0}}. Piv txwv li: thaum ntxiv 0.1% ntawm cov ntsiab lus alloying los txhim kho lub zog ntawm cov hlau hauv cov lus hauv qab no: niobium 118MPa; vanadium 71.5MPa; molybdenum 40MPa; manganese 17.6MPa; titanium yog xoom. Qhov tseeb, steel tsuas yog yuav tsum tau ntxiv 0.03% -0.05% Nb, lub zog ntawm cov hlau tuaj yeem nce ntau dua 30%. Thiab tus nqi ntawm cov hlau ib tuj tsuas yog nce los ntawm 1 US las. Piv txwv li: lub zog tawm los ntawm cov pa roj carbon zoo tib yam yog feem ntau 250MPa, ntxiv cov kab niobium tuaj yeem ua rau lub zog nce mus rau 350-800MPa.

Niobium ua cov ntsiab lus micro-alloying ntxiv rau cov hlau tsis hloov cov qauv hlau, tab sis nrog cov hlau ntawm carbon # nitrogen # sulfur ua ke, hloov cov microstructure ntawm hlau. Lub zog ntawm niobium ntawm cov hlau feem ntau yog nplua nplej ntxiv dag zog thiab diffusion ntxiv dag zog, niobium thiab carbon thiab nitrogen hauv cov hlau los tsim cov carbides ruaj khov thiab carbon-nitrides. Nws kuj disperses carbides thiab cov ntaub ntawv hlau nrog zoo crystallization.
Niobium kuj tseem ua kom muaj kev faib tawm ntawm cov nag lossis daus los ntawm kev ua kom nag lossis daus thiab tswj cov cua txias. Lub toughness theem ntawm cov hlau yog kho nyob rau hauv ntau yam. Yog li ntawd, qhov sib ntxiv ntawm niobium tsis yog tsuas yog ua kom lub zog ntawm cov hlau, tab sis kuj txhim kho nws cov tawv nqaij, tsis kam mus rau qhov kub thiab txias oxidation thiab corrosion kuj! Txo cov kev hloov pauv kub ntawm cov hlau, tau txais cov khoom siv vuam zoo thiab cov khoom molding.