Nyob rau hauv cov roj nitriding, cov cua kub kub yog 500-600 degree. Nitrogen atoms nyob rau saum npoo ntawm txhuas hlau, chromium, molybdenum nitride tsim, qhov tob ntawm 0.1 0.6 hli, nitride txheej tsis xav tau cua txias tuaj yeem tau txais cov tawv tawv heev thiab tuav ntawm 600-650 degree, me deformation, tuaj yeem zam qhov corrosion ntawm dej, chav dej, alkaline tov, tab sis kuj tseem muaj qee lub sij hawm tsis zoo, xws li cov khoom hnyav, cov khoom hnyav thiab cov khoom hnyav, xws li cov khoom siv roj nitrate, thiab cov khoom siv roj hmab yuav tsum tsis txhob poob siab. concentrate, Nws yog tsuas yog siv rau kev ua qhov tseem ceeb thiab complex precision qhov chaw.
Piv nrog rau casehardening steel, cov txheej txheem kev kho cua sov no tso cai rau nitrogen atoms nkag mus rau saum npoo ntawm cov hlau los tsim cov txheej txheem nitrogen-nplua nuj hardening. Cov khoom tom qab nitriding kev kho mob muaj cov yam ntxwv nram qab no: siab hardness thiab hnav tsis kam, siab qaug zog tsis kam, siab dua los tiv thaiv- tom, siab dua corrosion resistance, nitriding txheej txheem ntawm theem hloov kub ntawm cov hlau hauv qab no (450-600 degree), me deformation, me ntsis ntim expansion. Qhov tsis zoo yog lub voj voog ntev (gas nitriding lub sij hawm mus txog 100h), tus nqi siab, nyias txheej (feem ntau yog li 0.5 hli) thiab nkig, tsis tuaj yeem tiv taus ntau dhau kev ntxhov siab thiab cuam tshuam kev thauj khoom.
Raws li txoj cai, tag nrho cov ntaub ntawv hlau tuaj yeem kho nrog nitriding, tab sis tsuas yog cov uas tsim nyog rau kev kho nitriding thiab cov txiaj ntsig zoo tuaj yeem hu ua nitriding steel. Qhov twg Cr, Mo, V, Ti, Al thiab lwm cov ntsiab lus ntawm qis thiab nruab nrab carbon alloy structural steel, cuab yeej hlau, stainless hlau (stainless steel nitriding kom tshem tawm cov passivation zaj duab xis nyob rau saum npoo ntawm lub workpiece.
Txawm hais tias cov khoom siv nitriding muaj qhov nyuaj siab, hnav tsis kam thiab qaug zog siab, lawv tsuas yog 0.3-0.65mm tuab (Cr-Mo-Al steel dhau los ntawm nitriding txheej 35-65h ntawm 500-540 40). Nws yog ib qho tsim nyog yuav tsum muaj cov ntaub so ntswg uas muaj zog thiab tiv taus lub plawv ua lub hauv paus rau qhov siab tshaj plaws nitriding nyhuv. Feem ntau nitriding steels yog siv nyob rau hauv kev sib txhuam thiab complex dynamic loads, yuav tsum tau high nto thiab core kev kawm.
Yog tias cov pa roj carbon steel tau kho nrog nitriding, nws yuav tsim Fe4N thiab Fe2N, uas tsis ruaj khov, yooj yim rau aggregate thiab tuab ntawm qhov kub thiab txias, thiab qhov saum npoo tsis tuaj yeem muaj zog dua thiab tsis tuaj yeem muaj zog dua thiab tawv hauv nws cov tub ntxhais. Txhawm rau kom tau txais qhov siab tawv thiab hnav tsis kam ntawm qhov chaw thiab lub plawv muaj zog thiab tawv tawv, qee qhov alloying yuav tsum tau ntxiv rau cov hlau uas tuaj yeem tsim cov khoom sib txuas ruaj khov nrog nitrogen thiab ntxiv dag zog rau lub plawv. Xws li Al, Ti, V, W, Mo, Cr, ntawm cov Cr, W, Mo, V kuj tuaj yeem txhim kho cov qauv ntawm cov hlau, txhim kho lub zog thiab tawv ntawm cov hlau.
Cov hlau zoo tshaj plaws uas tuaj yeem siv rau hauv nitriding yog GB 38 CrMoAlA (ISO, 41 CrAlMo74, Г О С Т 38 x2m Ю A (38 cad 6. 12}/30 cad 6. 12)), suav nrog txhuas thiab nitrogen hauv daim ntawv ntawm nitrides, nce lub zog ntawm cov hlau tseem ceeb hauv nitriding. Txawm hais tias 1000℃hardness ntawm 38CrMoAlA steel tom qab nitriding yog mus txog 1100-1200hv (67-72hrc) vim nws zoo nitriding kev kawm vim txhuas.
Rau cov khoom ua haujlwm nrog kev ua haujlwm siab thiab hnav tsis kam, carbon steel thiab cov hlau tsis tshua muaj hlau tsis pom zoo rau nitriding tshwj tsis yog tias nws txhim kho corrosion kuj.38 CrMoAlA steel muaj qhov cuam tshuam loj rau decarbonization, thiab cov txheej txheem nitriding yuav tsum tawm ntawm cov txheej txheem loj. Lus Cim rau nitriding qhov chaw:
1. Lub workpiece nitriding yuav tsum tau quenched thiab quenched ua ntej nitriding kom tau quenched sostenite qauv. Qhov kub quenching feem ntau yog siab tshaj qhov kub ntawm nitriding.
2. Tshem tawm cov kev ntxhov siab sab hauv uas tsim tawm hauv cov txheej txheem machining ua ntej nitriding kom stabilize qhov loj ntawm lub workpiece. Qhov ntsuas kub ntawm kev ntxhov siab yuav tsum qis dua qhov ntsuas kub, lub sijhawm tuav ntev dua li lub sijhawm tempering, thiab tom qab ntawd maj mam txias rau chav sov. Normalization tsis haum rau qhov chaw nrog cov ntu loj. Cov hlau tuag yuav tsum tau quenched thiab tempered, tab sis tsis annealed.
3. Qhov saum npoo roughness Ra ntawm nitriding qhov chaw yuav tsum tsawg dua 1.6 microns, thiab saum npoo yuav tsum tsis txhob puas los yog oxidized. Cov khoom uas tsis tuaj yeem ua haujlwm raws sijhawm yuav tsum tau oiled los tiv thaiv xeb. Tsa lub qhov cub nrog cov roj av huv si kom huv si.
4. Lub workpiece uas muaj lub kaum ntse ntse thiab ntse ntug thiab lub workpiece uas tsis tau ua tiav los ntawm kev sib tsoo tsis haum rau kev kho nitriding.
