Steel bar kev ua tau zoo

Cov txheej txheem kev ua tau zoo ntawm steel tuav suav nrog ntau yam khoom, thiab cov kev xav tau sib txawv tuaj yeem raug thov raws li cov yam ntxwv ntawm cov khoom sib txawv. Piv txwv li, cov hlau zoo tib yam yuav tsum tau khoov thiab rov qab khoov (rov qab khoov) kev sim, thaum qee qhov steel tuav yuav tsum tau rov khoov, torsion, thiab winding tests.
Tag nrho cov qauv kev sim no simulate mus rau qhov sib txawv ntawm cov txheej txheem kev ua haujlwm uas tuaj yeem koom nrog hauv kev siv cov ntaub ntawv tiag tiag, xws li kev xav tau ntawm cov hlau zoo tib yam yuav tsum tau khoov lossis tsim, thiab qhov xav tau rau cov hlua hlau prestressed qee zaum qhwv. Lub hom phiaj yog los soj ntsuam cov khoom siv qhov kawg ntawm cov kabmob muaj peev xwm rau cov yas deformations tshwj xeeb, thiab yog li cov txheej txheem kev ua tau zoo kuj yog ib qho kev xav tau ntawm cov khoom siv, uas yog raws li cov kev cai saum toj no ductility (elongation), Feem ntau hais lus, steel nrog siab elongation muaj. kev ua haujlwm zoo.
Txawm li cas los xij, piv rau lub xeev kev ntxhov siab unidirectional thaum lub sij hawm ncab, lub xeev kev ntxhov siab ntawm cov txheej txheem kev ntsuas kev ua tau zoo yog qhov nyuaj dua, thiab hom deformation thiab qhov loj ntawm cov qauv sib txawv hauv ob qho tib si cov lus qhia (axial thiab radial). Lub microstructure, qhov loj me, cov ntsiab lus tseem ceeb ntawm cov khoom seem, tshwj xeeb tshaj yog cov kev puas tsuaj sab hauv thiab sab hauv uas cuam tshuam rau kev deformation tsis tu ncua, xws li cov kab nrib pleb thiab suav nrog, tuaj yeem cuam tshuam thiab ua rau tsis ua tiav ntawm qhov kev xeem. Yog li hauv kev txiav txim siab, rau kev ntsuas qhov zoo ntawm cov hlau, nws tuaj yeem hais tias cov txheej txheem kev ua tau zoo yog qhov nruj dua.
Tsis tas li ntawd, qhov kev ntsuas rov qab khoov ntawm cov hlau tuav yog qhov tseem ceeb ntawm kev kuaj kev laus rhiab heev. Qhov no yog vim cov hlau molten feem ntau muaj qee qhov tsis muaj nitrogen (N), tseem hu ua residual nitrogen. Thaum cov ntsiab lus siab dhau lawm, nws tuaj yeem ua rau cov hlau ua rau cov yas deformation thiab ua nkig ntawm chav tsev kub.
Vim yog siv cov hlau tuav ntau zaus tom qab khoov thiab tsim, yas deformation twb tshwm sim. Yog tias cov khoom ua nkig, cov qauv tsis tuaj yeem tiv taus cov khoom sab nraud uas ua rau cov yas deformation ntawm cov hlau tuav (xws li av qeeg). Yog li ntawd, ob qho tib si hauv tsev thiab txawv teb chaws, qhov kev ntsuas rov qab khoov yog suav nrog qhov tseem ceeb ntawm cov txheej txheem steel bar, thiab cov ntsiab lus nitrogen ntawm cov hlau raug txwv (tsis pub tshaj 0.012%).
Kev tshawb fawb tau pom tias qee cov khoom siv rau microalloying hlau, xws li vanadium, titanium, niobium, thiab lwm yam, tshwj xeeb tshaj yog vanadium muaj kev sib raug zoo nrog nitrogen. Ntxiv vanadium rau hlau tuaj yeem khi dawb nitrogen zoo, thiab kev sib xyaw ntawm vanadium thiab nitrogen tuaj yeem txhim kho ntxiv dag zog ntawm vanadium ntawm hlau. Yog li ntawd, qee cov qauv kuj tau hais tias "yog tias muaj cov ntsiab lus txaus uas ua ke nrog nitrogen, cov ntsiab lus nitrogen tuaj yeem siab dua li cov qauv yuav tsum tau ua".
Vim lub fact tias cov anchoring tus neeg sawv cev yog tsim los ntawm high-lub zog cov ntaub ntawv raws li aggregates, cementitious cov ntaub ntawv raws li binders, thiab high flow micro expansion thiab anti segregation tshuaj, nws muaj pes tsawg leeg yog inorganic cov ntaub ntawv, supplemented los ntawm organic cov ntaub ntawv, thiab tsis muaj xeb nyhuv. ntawm steel tuav. Yog li ntawd, ib tug tej yam anchoring quab yuam yuav generated nyob rau hauv ob peb teev. Nws muaj cov yam ntxwv ntawm kev ruaj khov sai, ceev ceev, lub zog siab, tsis muaj shrinkage, siab shear zog, thiab tsis tshua muaj kev nkag mus. Txoj kev tsim kho no siv tau rau kev txhawb nqa ntawm pob zeb bolts nyob rau hauv ib puag ncig pob zeb txheej nyob rau hauv 3m ntawm tag nrho cov mining tunnels, tunnels, water conservancy, slopes support thiab lwm yam engineering tej yaam num.