Muaj qee qhov tshwj xeeb zoo rau cov kav hlau kav, tab sis qee cov kav hlau kav hauv khw tsis tau raws li qhov yuav tsum tau muaj cov qauv tsis tau.
Cov laj thawj rau qhov no tau txheeb xyuas raws li hauv qab no:
Ua ntej, qhov spheroidization tus nqi ntawm cov hlau ductiletsis ua raws li qhov yuav tsum tau ua, ua rau muaj qhov tsis zoo ntawm cov qauv thiab lamellar ferrite hauv cov khoom. Thib ob, vim qhov ceev ceev ntawm cov hlau molten thaum lub sij hawm casting,15% -25% eutectic carbon yog generatednyob rau hauv cov qauv thaum lub sij hawm sai solidification, ua rau "dawb hlau tsim" ntawm cov ntsiab lus tawg.
Txhim khoqhov elongation ntawm cov kav hlau hlau, annealing nyob rau hauv siab -kub nruam annealing rauv yog feem ntau yuav tsum tau tshem tawm cov tsim ntawm eutectic carbon.
Cov duab ntawm cov khoom tsis zoo
Unannealed ductile hlau feem ntau nthuav tawm cov kev hloov pauv ntawm lub cev hauv qab no:
Thaum lub sij hawm thauj mus los, hoisting, thiab installation,Cov kav hlau kav hlau yuav tsim cov kab nrib pleb lossis thaiv -zoo li kev puas tsuajvim muaj zog sab nraud(kev cuam tshuam, pob, siab los ntawm cov pob zeb backfilled, thiab lwm yam). Qhov no yog tshwm sim los ntawm tus nqi qis spheroidization, tsis muaj annealing, thiab qis elongation ntawm cov khoom siv hlau. Kev saib xyuas hnyav yuav tsum tau ua thaum lub sijhawm teeb tsa.
Cov duab ntawm cov khoom tsis zoo
Annealingyog qhov tseem ceebkauj ruam hauv kev txhim khotuskev ua tau zoo thiab zoontawm ductile hlau kav.
Txhim kho cov khoom siv kho tshuab
Tom qab annealing, microstructure ua ntau yam,uas txhim kho lub zog tensile thiab hardness ntawm ductile hlau kav thaum tuav siab toughness.
01
Tshem tawm cov ntaub so ntswg ntawm lub qhov ncauj
Centrifugal ductile hlau kav dej txias sai heev thaum lub sij hawm casting, yooj yim ua rau dawb cam khwb cia hlau qauv. Annealing tuaj yeem tshem tawm cov qauv no, yielding asiab -toughness ferrite matrix.
02
Txhim kho lub koom haum
Annealing tuaj yeem txhawb nqa graphitization, decompose lub eutectoid cementite hauv pearlite, thiab tau txais ferritic matrix ductile hlau nrog siab plasticity thiab toughness,li no optimizing cov neeg kho tshuab zog ntawm cov kav hlau kav hlau, nrog rau hardness thiab lub zog.
03
Tshem tawm kev ntxhov siab sab hauv
Annealing tuaj yeem tshem tawm kev ntxhov siab sab hauv hauv castings, tso cai rau cov kav dejtuav ruaj khov zoo thiab cov qauv, kom ntseeg tau ntev -lub sij hawm.
04
Annealing ho txhim kho qhov kev ua tau zoo thiab zoo ntawm cov kav hlau kav hlau. Annealed ductile hlau kav yuav tsum tau metallographic tsom xam thiab kev soj ntsuam kev ua tau zoo los xyuas kom meej lawv microstructure thiab mechanical zog raws li lub teb chaws tus qauv.
Cov duab ntawm cov khoom tsim nyog