1. Chromium Cov ntsiab lus ntau ntawm Inconel 625
Inconel 625 yog npib tsib xee -chromium- molybdenum- niobium superalloy, thiab nws cov ntsiab lus chromium yog nruj me ntsis tswj nyob rau hauv ib tug nqaim ntau yam los xyuas kom meej cov alloy qhov kev ua tau zoo. Raws li cov qauv thoob ntiaj teb (piv txwv li, ASTM B446, ASTM B564) thiab alloy muaj pes tsawg leeg specifications, cov ntsiab lus chromium ntawm Inconel 625 yog 20.0% -23.0% los ntawm qhov hnyav.
Cov ntsiab lus ruaj khov no yog qhov tsim qauv tseem ceeb ntawm cov hlau. Cov ntsiab lus chromium qis dua 20.0% yuav txo tau cov hlau alloy qhov corrosion kuj, thaum cov ntsiab lus siab tshaj 23.0% tuaj yeem txhawb cov nag lossis daus ntawm cov txheej txheem intermetallic (xws li theem σ) thaum lub sij hawm siab - qhov kub thiab txias, uas yuav cuam tshuam cov alloy lub toughness thiab ductility.
2. Kev ua haujlwm ntawm Chromium hauv Inconel 625
Chromium yog ib qho ntawm cov tseem ceeb alloying ntsiab nyob rau hauv Inconel 625, thiab nws plays ntau yam irreplaceable lub luag hauj lwm nyob rau hauv optimizing lub alloy lub corrosion kuj, siab - kub stability, thiab structural kev ncaj ncees.
(1) Dominating Corrosion Resistance
Lub luag haujlwm tseem ceeb tshaj plaws ntawm chromium yog muab rau Inconel 625 nrog kev tiv thaiv corrosion zoo heev los ntawm kev tsim cov yeeb yaj kiab passive:
Passive zaj duab xis tsim: Thaum raug oxidizing los yog tsis muaj zog oxidizing ib puag ncig, chromium atoms ntawm lub alloy nto react nrog oxygen los tsim ib tug ntom, adherent, thiab chemically ruaj khov chromium oxide (Cr₂O₃) zaj duab xis. Cov yeeb yaj kiab no tsuas yog ob peb nanometers tuab tab sis tuaj yeem cais cov hauv paus alloy matrix los ntawm corrosive media, tiv thaiv oxidation ntxiv lossis corrosion.
Dav -spectrum corrosion kuj txhawb: Lub Cr₂O₃ passive zaj duab xis ua rau Inconel 625 los tiv thaiv cov corrosion tsis xws luag, pitting corrosion, crevice corrosion, thiab intergranular corrosion nyob rau hauv ntau yam hnyav ib puag ncig. Piv txwv li, nyob rau hauv chemical ua ib puag ncig uas muaj chloride ions, acids, los yog alkalis, cov zaj duab xis passive tseem nyob ruaj khov thiab tsis tawg yooj yim, uas yog vim li cas Inconel 625 yog dav siv nyob rau hauv seawater kho, acid pickling, thiab tshuaj reactor systems.
Synergy nrog rau lwm cov ntsiab lus: Chromium ua haujlwm synergistically nrog molybdenum thiab niobium hauv cov hlau. Molybdenum txhim khu cov hlau tsis kam rau pitting corrosion hauv chloride- muaj ib puag ncig, thaum niobium stabilizes cov qauv nplej. Chromium's passive zaj duab xis muab cov txheej txheem tiv thaiv kev tiv thaiv corrosion, tso cai rau lwm cov ntsiab lus los siv lawv cov txiaj ntsig zoo.
(2) Txhim kho siab -kub Oxidation Resistance
Nyob rau hauv siab - qhov kub thiab txias kev pab cuam ib puag ncig (txog 980 degree), chromium tseem ua lub luag haujlwm tseem ceeb hauv kev tswj cov hlau ruaj khov:
Ntawm qhov kub siab, Cr₂O₃ zaj duab xis ntawm cov hlau nplaum tuaj yeem rov tsim dua tshiab. Txawm hais tias cov yeeb yaj kiab puas me ntsis, chromium atoms hauv matrix tuaj yeem tawg sai sai rau saum npoo thiab hnov mob nrog oxygen los kho cov zaj duab xis, tiv thaiv cov hlau los ntawm oxidized thiab scaled ntawm qhov kub thiab txias.
Cov yam ntxwv no ua rau Inconel 625 haum rau siab - cov khoom siv kub hauv kev lag luam chemical thiab petrochemical, xws li cov raj rauv, cov raj cua sov, thiab siab - cov khoom siv hluav taws xob kub.
(3) Txhim kho cov qauv kev ruaj ntseg thiab cov cuab yeej cuab tam
Chromium kuj tseem pab txhawb kev ua kom zoo ntawm cov hlau alloy lub microstructure thiab txhua yam khoom:
Nws refines lub grain loj ntawm cov npib tsib xee-raws li matrix thaum lub sij hawm lub alloy lub smelting thiab tshav kub kev kho mob txheej txheem, uas txhim kho cov alloy lub zog thiab toughness tshuav nyiaj li cas.
Chromium txo qhov nyiam ntawm cov hlau los tsim cov theem teeb meem (piv txwv li, Laves theem) thaum lub sij hawm ntev - lub sij hawm siab - kub aging, yog li tuav lub alloy lub sij hawm ntev - lub sij hawm structural stability thiab tiv thaiv kev ua tau zoo degradation.
