1. Kev ua haujlwm ruaj khov nyob rau nruab nrab- qhov kub thiab txias (tsawg dua lossis sib npaug li 427℃/ 800℃F)
Mechanical khoom stability: Cov hlau ua tiav nws lub zog siab tshaj plaws los ntawm kev kho nag lossis daus hardening (kev laus ntawm 482-510℃rau 4-8 teev), ua kom muaj kev sib txawv ntawm Ni₃ (Al, Ti) intermetallic theem. Ntawm qhov kub thiab txias tsawg dua lossis sib npaug li 427 degree, cov dej nag no nyob ruaj khov, ua kom cov hlau muaj zog tensile siab (Ntau dua lossis sib npaug rau 1034 MPa), lub zog tawm los (Ntau dua lossis sib npaug rau 793 MPa), thiab qaug zog ua haujlwm. Creep deformation yog negligible nyob rau hauv cov qauv tsim kev nyuaj siab, ua rau nws haum rau ntev -lub sij hawm load{10}} bearing daim ntaub ntawv xws li siab - kub fasteners thiab valve Cheebtsam.
Corrosion kuj stability: In oxidizing (air, steam), neutral (water), and mild reducing atmospheres, Monel K500 forms a dense, adherent oxide film (composed of NiO and Cu₂O) on its surface. Cov yeeb yaj kiab no zoo tiv thaiv ntxiv oxidation thiab corrosion, thiab nws qhov ruaj khov yog piv rau Monel 400. Hauv marine lossis industrial siab -kub dej ib puag ncig, cov hlau kuj tiv taus pitting thiab crevice corrosion.
2. Kev ua haujlwm tsis zoo hauv qhov siab - qhov kub thiab txias (427℃- 482℃/ 800℃F - 900℃F)
Precipitate tshaj -aging: Ni₃(Al,Ti) precipitates uas ua rau lub zog pib coarsen thiab aggregate, txo lawv cov dispersion ntxiv zog. Raws li qhov tshwm sim, cov alloy lub zog tensile thiab lub zog tawm los txo qis los ntawm 10-15% piv rau qhov nruab nrab- qhov kub thiab txias, thaum ductility (elongation) nce me ntsis. Qhov no dhau - qhov tshwm sim kev laus yog irreversible; Txawm hais tias cov hlau yog txias rau hauv chav tsev kub, nws lub zog siab qub tsis tuaj yeem rov qab los yam tsis muaj kev kho cua sov.
Oxidation tus nqi acceleration: Cov oxide zaj duab xis ntawm cov hlau nplaum hloov ntawm ntom mus rau ntxeem tau. Hauv huab cua qhuav, oxidation tus nqi nce li ntawm 3-5 npaug piv rau qhov ntawd ntawm 400 degree, ua rau me ntsis tev ntawm oxide txheej tom qab ntev - lub sij hawm raug (ntau tshaj 1000 teev). Txawm li cas los xij, hauv kev txo cov huab cua (piv txwv li, hydrogen, ammonia), qhov kev hloov pauv no tau txo qis vim qhov tsis muaj oxidation hnyav.
3. Kev ua haujlwm hnyav tsis ruaj khov siab dua 482℃(900℃F)
Ua tiav dhau - kev laus tsis ua haujlwm: Ni₃ (Al, Ti) precipitates yaj rau hauv matrix, thiab cov hlau poob nws cov nag lossis daus - lub zog hnyav, rov qab mus rau cov cuab yeej cuab tam nyob ze ntawm Monel 400. Creep deformation ua qhov tseem ceeb hauv kev thauj khoom, thiab cov creep rupture lub neej yog luv luv (piv txwv li, ntawm 10 MP rupture lub neej 5. tsawg dua 100 teev).
Muaj zog oxidation thiab corrosion: Cov oxide zaj duab xis poob nws qhov kev tiv thaiv tag nrho, thiab oxidation sab hauv tshwm sim (oxygen nkag mus rau hauv cov hlau matrix). Nyob rau hauv corrosive media xws li siab -kub acidic chav, intergranular corrosion yuav tshwm sim, ua rau brittle puas ntawm cov khoom.
Luv -lub sij hawm tshav kub tsis kam: Rau luv luv -lub sij hawm (feeb mus rau teev) unloaded exposure, Monel K500 tuaj yeem tiv taus kub txog 982℃(1800℃F), tab sis tom qab txias, cov hlau ua nkig, nrog rau qhov txo qis hauv qhov hnyav (los ntawm ntau dua lossis sib npaug li 54 J rau Tsawg dua lossis sib npaug rau 15 J rau qhov kub thiab txias).
4. Yam tseem ceeb cuam tshuam rau siab -kub ruaj khov
Atmosphere hom: Txo cov cua kub zoo dua rau kev tswj kev ruaj ntseg dua li oxidizing cua; nyob rau hauv corrosive media (xws li, sulfuric acid, chloride daws), kub kub yuav synergistically ceev corrosion, ntxiv txo qhov kev pab cuam kub txwv.
Qib kev nyuaj siab: Nyob rau hauv siab tensile los yog cyclic kev nyuaj siab, cov hlau yog feem ntau yuav nkag mus rau hauv creep- qaug zog kev cuam tshuam tsis ua hauj lwm, yog li qhov tso cai kub yuav tsum tau txo los ntawm 30-50℃raws li qhov tseeb kev nyuaj siab.
Kev kho cua sov keeb kwm: Kev kho cov nag lossis daus kom zoo yog qhov yuav tsum tau ua ua ntej kom ntseeg tau tias siab - qhov kub thiab txias. Tshaj - kev laus lossis kev laus tsis tiav yuav ua rau txo qis hauv cov hlau alloy siab - qhov kub thiab txias.
