Zero tshav kub preservation, quenching thiab normalizing forgings

Nyob rau hauv kev kho cua sov ntawm forging, vim lub zog loj ntawm lub qhov cub cua sov thiab lub sij hawm ntev rwb thaiv tsev, lub zog noj yog loj nyob rau hauv tag nrho cov txheej txheem, nyob rau hauv lub sij hawm ntev, yuav ua li cas txuag lub zog nyob rau hauv lub tshav kub kev kho mob ntawm forging. ib qho teeb meem nyuaj.

Lub thiaj li hu ua "zero rwb thaiv tsev" quenching, yog taw tes rau lub forging cua sov, nws nto thiab core kom ncav cuag lub quenching cua sov kub, tsis muaj rwb thaiv tsev, tam sim ntawd quenching txias txheej txheem. Lub sij hawm rwb thaiv tsev nyob rau hauv cov txheej txheem cua sov, thiaj li ua kom tiav cov nucleation thiab kev loj hlob ntawm cov nplej austenitic, lub dissolution ntawm residual cementite thiab homogenization ntawm austenitic.Qhov tam sim no quenching thiab cua sov tshuab ntawm forgings yog tsim nyob rau hauv cov kev taw qhia ntawm no txoj kev xav.Piv rau cov Cov txheej txheem quenching tam sim no, "zero heat preservation" quenching txuag lub sijhawm ntawm kev txuag hluav taws xob xav tau los ntawm homogenization ntawm austenitic qauv, tsis tsuas yog tuaj yeem txuag tau 20% -30% ntawm lub zog, txhim kho kev ua haujlwm ntawm 20% -30%, tab sis kuj tuaj yeem txo tau. los yog tshem tawm qhov tsis xws luag ntawm oxidation, decarbonization, deformation thiab lwm yam, uas yog qhov tsim nyog rau kev txhim kho cov khoom zoo.

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Thaum cov pa roj carbon steel thiab cov hlau tsis tshua muaj cua sov rau Ac1 lossis Ac2, cov txheej txheem homogenization ntawm austenite thiab kev sib cais ntawm carbides hauv pearlite yog sai dua.Thaum cov hlau loj belongs rau qhov sib txawv nyias, lub sijhawm cua sov tsis tas yuav xav txog. Lub thermal rwb thaiv tsev, uas yog, kom ua tiav xoom thermal rwb thaiv tsev quenching.Piv txwv li, thaum lub cheeb los yog thickness ntawm 45 steel workpiece tsis ntau tshaj 100 hli, cua sov nyob rau hauv lub cua kub cua sov, qhov kub ntawm qhov chaw thiab cov tub ntxhais yuav luag txog ntawm tib lub sijhawm, yog li nws lub sijhawm tsis sib xws tuaj yeem tsis quav ntsej, piv nrog cov txheej txheem tsim khoom ib txwm muaj (r = aD) nrog cov cua kub loj, tuaj yeem txo los ntawm ze li ntawm 20% -25% quenching cua sov lub sijhawm.

Kev soj ntsuam theoretical thiab kev sim ua tau pom tias nws muaj peev xwm txais yuav "zero rwb thaiv tsev" hauv quenching thiab normalizing cua sov ntawm cov qauv steel.Tshwj xeeb, 45, 45 mn2 carbon structural steel los yog ib lub caij alloy structural steel, siv "zero rwb thaiv tsev" Cov txheej txheem tuaj yeem ua kom cov khoom siv hluav taws xob ntawm qhov yuav tsum tau ua; 45, 35CrMo, GCrl5 thiab lwm yam khoom siv hlau ua haujlwm, kev siv "zero rwb thaiv tsev" cua sov dua li cov cua kub ib txwm tuaj yeem txuag lub sijhawm cua sov li ntawm 50%, tag nrho lub zog txuag ntawm 10% - 15%, txhim kho qhov ua tau zoo ntawm 20% -30%, tib lub sijhawm "xoom rwb thaiv tsev" txheej txheem quenching pab ua kom cov nplej, txhim kho lub zog.

(Los ntawm: 168 forgings net)


Post lub sij hawm: Mar-26-2020

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