Kev kho cua sov txheej txheem ntawm hmoov metallurgy cov ntaub ntawv

Kev kho cua sov txheej txheem ntawm hmoov metallurgy cov ntaub ntawv
Koj puas to taub cov txheej txheem kev kho cua sov ntawm cov khoom siv hmoov metallurgy? Niaj hnub no, hmoov metallurgy cov ntaub ntawv tau siv ntau zuj zus, thiab lawv muaj cov txiaj ntsig zoo hauv kev hloov cov ntaub ntawv cam khwb cia nrog tsawg ntom, tsis tshua muaj zog, thiab lub zog. Kev kho cua sov ntawm cov khoom siv hlau metallurgy muaj ntau hom: quenching, tshuaj kho cua sov, kev kho cua sov, thiab kev kho cua sov tshwj xeeb:
hmoov metallurgy
1. Kev kho cua sov txheej txheem
Vim muaj cov pores, hmoov metallurgy cov ntaub ntawv muaj cov cua sov hloov qis dua cov ntaub ntawv ntom ntom, ua rau cov tawv tawv tsis zoo thaum quenching. Tsis tas li ntawd, thaum lub sij hawm quenching, sintering ceev ntawm cov khoom siv hmoov yog ncaj qha proportional rau thermal conductivity ntawm cov khoom; Vim tias qhov sib txawv ntawm cov txheej txheem sintering thiab cov ntaub ntawv ntom ntom, cov qauv sab hauv cov khoom sib xws ntawm cov hmoov hlau metallurgy zoo dua li cov ntaub ntawv ntom ntom. Txawm li cas los xij, muaj qhov tsis sib xws me me hauv micro cheeb tsam, yog li lub sijhawm ua tiav austenitization yog 50 feem pua ​​​​ntev dua li qhov sib thooj forging. Thaum ntxiv cov ntsiab lus alloy, qhov ua tiav austenitization kub yuav siab dua thiab lub sijhawm yuav ntev dua.
Nyob rau hauv kev kho cua sov ntawm hmoov metallurgy cov ntaub ntawv, txhawm rau txhim kho hardenability, qee cov hlau alloy xws li npib tsib xee, molybdenum, manganese, chromium, vanadium, thiab lwm yam. Lawv cov txheej txheem ua haujlwm yog tib yam li cov ntaub ntawv ntom ntom, uas tuaj yeem ua kom zoo dua cov nplej. Thaum lawv yaj nyob rau hauv austenite, lawv yuav ua rau kom muaj kev ruaj ntseg ntawm undercooled austenite, xyuas kom meej lub transformation ntawm austenite thaum lub sij hawm quenching, nce lub hardness ntawm cov khoom tom qab quenching, thiab kuj nce lub quenching qhov tob. Tsis tas li ntawd, hmoov metallurgy cov ntaub ntawv yuav tsum tau tempering kho tom qab quenching. Kev tswj qhov kub thiab txias ntawm kev kho tempering muaj qhov cuam tshuam loj rau kev ua haujlwm ntawm cov khoom siv hmoov metallurgy. Yog li ntawd, qhov ntsuas kub yuav tsum tau txiav txim siab raws li cov yam ntxwv ntawm cov khoom sib txawv kom txo tau qhov cuam tshuam ntawm tempering brittleness. Feem ntau, cov ntaub ntawv tuaj yeem raug tempered hauv huab cua lossis roj ntawm {{0}} degree rau 0.5-1.0 teev.
2. Cov txheej txheem kev kho cua sov
Kev kho cua sov feem ntau suav nrog peb cov txheej txheem yooj yim: decomposition, absorption, thiab diffusion. Piv txwv li, cov tshuaj tiv thaiv ntawm carburizing kev kho cua sov yog raws li nram no:
2CO ≈ [C] ntxiv rau CO2 (exothermic cov tshuaj tiv thaiv)
CH4 ≈ [C] ntxiv rau 2H2 (endothermic cov tshuaj tiv thaiv)
Tom qab carbon decomposition, nws yog absorbed los ntawm cov hlau nto thiab maj diffuses sab hauv. Tom qab tau txais cov pa roj carbon ntau txaus rau saum npoo ntawm cov khoom, quenching thiab tempering kho tuaj yeem txhim kho qhov tawv tawv thiab quenching qhov tob ntawm cov ntaub ntawv hlau metallurgy. Vim muaj cov pores nyob rau hauv cov hmoov metallurgy cov ntaub ntawv, activated carbon atoms nkag los ntawm lub nto mus rau hauv lub sab hauv, ua kom tiav cov txheej txheem ntawm tshuaj kho cua sov. Txawm li cas los xij, cov khoom siv ntom ntom ntom ntom ntom, tus qaug zog lub pore nyhuv, thiab qhov pom tseeb tsawg ntawm kev kho cua sov. Yog li ntawd, ib qho kev txo qis cua uas muaj peev xwm ntau dua yuav tsum tau siv los tiv thaiv. Raws li lub pore yam ntxwv ntawm cov hmoov hlau metallurgy cov ntaub ntawv, lawv cov cua sov thiab cua txias yog qis dua li cov ntaub ntawv ntom ntom, yog li nws yog ib qho tsim nyog yuav tsum tau ncua lub sij hawm rwb thaiv tsev thiab ua kom kub kub thaum lub sij hawm cua sov.
Kev kho cua sov ntawm cov hmoov metallurgy cov ntaub ntawv suav nrog ntau hom, xws li carburization, nitriding, sulfurization, thiab multicomponent co infiltration. Hauv kev kho cua sov tshuaj, qhov quenching qhov tob yog feem ntau cuam tshuam nrog qhov ntom ntawm cov khoom. Yog li ntawd, cov kev ntsuas sib raug tuaj yeem raug coj mus rau hauv cov txheej txheem kev kho cua sov, xws li ncua sij hawm kom tsim nyog thaum cov khoom siv ntom ntom ntau dua 7g / cm3 thaum carburization. Kev kho cua sov tshuaj tuaj yeem txhim kho qhov hnav tsis kam ntawm cov ntaub ntawv. Cov txheej txheem tsis sib xws ntawm austenite carburization ntawm hmoov metallurgy cov ntaub ntawv tuaj yeem ua tiav cov ntsiab lus carbon ntau dua 2 feem pua ​​​​ntawm cov khoom kho cov txheej txheem carburized. Carbides yog sib npaug ntawm cov txheej txheem carburized, uas tuaj yeem txhim kho hardness thiab hnav tsis kam.
Hmoov Metallurgical Khoom
3. Chav kho mob
Kev kho chav dej yog cov txheej txheem ntawm cov cua sov ua kom oxidize ntawm cov khoom siv, tsim cov oxide zaj duab xis rau saum npoo, yog li txhim kho kev ua haujlwm ntawm cov khoom siv hmoov metallurgy. Tshwj xeeb tshaj yog rau saum npoo los tiv thaiv corrosion ntawm hmoov metallurgy cov ntaub ntawv, lub sij hawm siv tau yog qhov zoo dua li kev kho mob blueing, thiab hardness thiab hnav tsis kam ntawm cov khoom kho tau nce ntxiv.
4. Kev kho cua sov tshwj xeeb
Kev kho cua sov tshwj xeeb yog cov khoom siv thev naus laus zis hauv xyoo tas los no, suav nrog induction cua sov quenching, laser deg hardening, thiab lwm yam. Induction cua sov quenching yog nyob rau hauv kev cuam tshuam ntawm high-frequency electromagnetic induction eddy tam sim no, uas tsub kom lub cua sov kub sai sai thiab muaj ib tug tseem ceeb cuam tshuam rau qhov nce ntawm hardness. Txawm li cas los xij, cov pob muag muag tau tshwm sim, thiab cov cua sov sib cuam tshuam feem ntau tuaj yeem siv los txuas rau lub sijhawm austenitizing; Laser nto hardening txheej txheem siv laser raws li lub tshav kub qhov chaw kom sai sai thiab txias cov hlau nto, ua rau nws nyuaj rau substructure nyob rau hauv lub austenite nplej kom zoo thiab recrystallize, uas ua rau ultrafine qauv.