1.Qhov kev lag luam - tawm los ntawm cov khoom - kev daws teeb meem ntxiv dag zog
Thaum cov ntsiab lus no tau ntxiv rau hauv qhov tsim nyog, lawv ua rau lattice distortion ntawm nickel matrix, uas ua rau muaj txiaj ntsig zoo.chav - kub thiab siab - kub hardnessntawm cov alloy, thiab txhim khu nws hnav tsis kam.
Txawm li cas los xij, ntau qhov sib ntxiv ntawm cov ntsiab lus no yuav ua rau tsis sib xws ntawm cov khoom sib xyaw matrix, txo qhov sib xws ntawm cov yeeb yaj kiab passivation tsim rau ntawm cov hlau nplaum, thiab txawm tias ua rau nag lossis daus ntawm nkig intermetallic theem lossis carbides ntawm cov ciam teb. Cov kev hloov microstructural no yuav rhuav tshem cov kev ncaj ncees ntawm cov zaj duab xis passive, ua rau muaj kev pheej hmoo ntawm pitting corrosion thiab intergranular corrosion, thiab yog li txo qhov kev pheej hmoo ntawm pitting corrosion.zuag qhia tag nrho corrosion kujntawm cov hlau nyob rau hauv ib puag ncig hnyav (xws li acidic, chloride - muaj xov xwm).
Thaum lub sij hawm laus, ib tug loj tus naj npawb ntawm nplua thiab dispersed ntxiv zog theem (xws li ' - Ni₃ (Al, Ti) theem) precipitate los ntawm lub matrix, uas yuav pin dislocations thiab ho txhim kho hardness thiab lub zog ntawm cov alloy.
Txawm li cas los xij, yog tias cov txheej txheem kev laus tsis raug tswj xyuas kom zoo (xws li, dhau - laus), cov theem ntxiv yuav loj tuaj, thiab txawm tias ua ke nrog cov pa roj carbon monoxide los ua chromium - cov cheeb tsam tsis zoo ntawm cov ciam teb. The chromium - poor zones lose the ability to form a dense passivation film, which will sharply reduce theintergranular corrosion kujntawm lub alloy. Nyob rau hauv sib piv, kev daws annealing kev kho mob yuav yaj lub ntxiv zog theem rau hauv lub matrix, txhim kho lub uniformity ntawm alloy, txhim khu corrosion kuj, tab sis lub hardness ntawm lub alloy yuav txo raws li.
Tsim nyog lub ntsiab sib phim: Thaum ntxiv cov ntsiab lus ntxiv dag zog, nce cov ntsiab lus ntawm corrosion - cov khoom tiv thaiv xws li chromium (Cr) thiab molybdenum (Mo) kom tsim nyog. Chromium tuaj yeem txhawb kev tsim kom ruaj khov Cr₂O₃ passivation zaj duab xis, thiab molybdenum tuaj yeem txhim kho pitting corrosion kuj ntawm cov hlau, offsetting qhov cuam tshuam tsis zoo ntawm kev ntxiv dag zog rau kev tiv thaiv corrosion.
Precision kub kho: Txais ob - cov txheej txheem kev laus los tswj qhov loj me, morphology, thiab kev faib tawm ntawm cov txheej txheem ntxiv dag zog, kom ntseeg tau tias cov hlau muaj qhov tawv tawv siab thaum tsis txhob tsim cov chromium - cov cheeb tsam tsis zoo.
Nto hloov tshuab: Siv txoj kev kho saum npoo xws li nitriding thiab passivation. Cov txheej txheej nitriding tuaj yeem txhim kho qhov tawv tawv thiab hnav tsis kam ntawm cov hlau, thaum kev kho mob tuaj yeem ua kom zoo dua cov qauv ntawm cov yeeb yaj kiab thiab txhim khu kev tiv thaiv corrosion, kom lub ntsej muag thiab matrix ntawm alloy tuaj yeem tau txais cov khoom zoo heev.
