Sorbitized (5.50) precision steel yeeb nkab rau tsheb qhov chaw.Thawj lub npe yog "lead quenching method".Txij li thaum xyoo 1950, peb lub teb chaws tau ua kom sov cov hlau xaim mus rau qhov ntsuas kub austenitizing, thiab tom qab ntawd muab tso rau hauv cov hmoov txhuas da dej ntawm qhov kub thiab txias ze ntawm lub qhov ntswg ntawm isothermal transformation diagram.Lub isothermal kub yog tswj kom txog thaum lub austenitic decomposition tiav, thiab ces lubprecision steel yeeb nkabtshwj xeeb yog siv rau lub tsheb qhov chaw raug tshem tawm thiab txias hauv huab cua kom tau txais tag nrho lossis feem ntau ntawm cov qauv sorbite.Cov cua sov ntawm tus kheej thiab kev kub ntxhov (6.4) (6.5).
Yav dhau los, muaj ib lo lus dav dav ntawm "spontaneous combustion", uas tau nkag siab los txhais tau tias tom qab qhov chaw quenching ntawm precision steel yeeb nkab rau tsheb qhov chaw, quenched qhov chaw ntawm lub tsheb.precision seamless yeeb nkabrau lub tsheb qhov chaw tau rhuab thiab tempered vim lub tshav kub conduction sab hauv lub plawv.Txawm li cas los xij, los ntawm kev kawm tob ntawm cov pa roj carbon tsawg, nws pom tau tias vim nws qhov siab Ms point, lub tempering yog tshwm sim nyob rau hauv cov txheej txheem quenching.precision steel kav rau tsheb accessories, uas yog hu ua spontaneous tempering.Qhov no yog cov txheej txheem ntawm kev hloov hluav taws xob los ntawm cov tub ntxhais ntawm precision tsheb steel kav mus rau saum npoo thiab tempering los ntawm cua sov.Natural stabilization (los yog natural stabilization kho) (7.8).
Casting muab tso rau hauv cov huab cua qhib rau lub sijhawm ntev yuav ua rau kev ntxhov siab ntawm kev ntxhov siab, yog li stabilizing cov duab thiab qhov loj ntawm cov casting, uas feem ntau hu ua kev laus hauv Suav teb.Txawm hais tias lo lus Askiv "seasoning" tuaj yeem txhais tau tias "kev laus", kev laus tau hais meej meej nyob rau hauv cov txheej txheem ntawm kev kho cua sov tshwj xeeb ntawm cov yeeb nkab steel rau cov hlau thiab cov khoom siv pib, uas yog, tom qab kev kho mob los yog txias yas deformation, nws qhov kev ua tau zoo hloov nrog lub sij hawm thaum nws muab tso rau hauv chav tsev kub lossis kub dua me ntsis.
Kev hloov pauv ntawm precision steel yeeb nkab cov ntaub ntawv tshwj xeeb yog siv rau lub tsheb qhov chaw tom qab kev laus yog cov nag lossis daus ntawm cov khoom tsim los ntawm cov khoom siv diffusion, tsis suav nrog kev so lossis tshem tawm cov kev ntxhov siab sab hauv.Txhawm rau kom tsis txhob muaj kev ntxhov siab, castings yuav tsum raug hu ua "natural (los yog natural) stability" es tsis txhob "aging".Kev faib tawm cov ntsiab lus carbon (8.23).Cov ntsiab lus carbon ntawm tshwj xeeb precision steel yeeb nkab rau tsheb qhov chaw hais txog cov pa roj carbon ntsiab lus nyob rau hauv tag nrho los yog ib feem ntawm cov hlau qhov chaw, tab sis tsis muaj ib tug txwv daim ntawv.Nws cov pa roj carbon concentration yog txwv rau cov khoom siv hauv α Hlau lossis γ Cov ntsiab lus ntawm cov hlau.
Carbides feem ntau tshwm sim nyob rau hauv carburized nto ntawm alloy steel automotive precision steel hlab, tshwj xeeb tshaj yog cov carbide ntxiv dag zog rau carburizing (8.14) tsim nyob rau hauv xyoo tas los.Yog li ntawd, nws yog qhov tsim nyog los coj cov ntsiab lus carbon raws li kev qhia ntau ntawm cov ntsiab lus carbon hauv txheej carburized.Cov pa roj carbon monoxide (8.27).Lub ntsiab lus ntawm lub cev ntawm kev ua ub no yog qhov ua tau zoo ntawm cov kua nplaum uas tau muab rau hauv ib qho kev daws teeb meem (los yog cov tshuaj tov khoom).Carburizing ntawm precision steel kav rau tsheb qhov chaw yog feem ntau ua nyob rau hauv lub austenitic lub xeev, yog li cov pa roj carbon kev ua si ntawm steel carburizing feem ntau yog hais txog qhov zoo concentration ntawm carbon nyob rau hauv lub austenite.
Nws yuav tsum tau taw qhia tias qhov kev ua si thiab kev ua si coefficient ntawm carbon hauv ferrite yuav tsum tsis txhob suav los ntawm kev siv cov qauv ntawm kev xav.Terminology rau kev kho deg ntawm precision ci raj rau tsheb.Vim tias qhov kev kho saum npoo ntawm cov kav hlau steel rau lub tsheb yog ib qho kev hloov kho siv thev naus laus zis hauv kev lag luam khoom siv niaj hnub no, cov ntsiab lus ntawm laser cladding (12.1), laser shock kho (12.2), micro arc oxidation (12.3), ion implantation ( 12.4), khaus pulsed electron beam irradiation (12.20), plasma spraying (12.21), thermal spraying (12.22) thiab lwm yam ntsiab lus tau ntxiv raws li cov nqe lus ntawm 1999 tsab.Rau lub hauv paus no, peb tau kho cov nqe lus ntawm cov tsheb sib kis no ncej precision steel raj,thiab tau ua tiav txoj haujlwm zoo hauv engineering nto thiab kev kho cua sov sib xyaw ntawm cov ntsiab lus deposition
Post lub sij hawm: Oct-10-2022