Kev tswj cov hlau stainless hlau intergranular corrosion, 304 stainless hlau, 304 stainless hlau xeb thiab corrosion hauv stainless hlau intergranular corrosion hauv qee 10%, nws yuav ua rau qhov adhesion ntawm cov nplej tau poob qis, nyob rau hauv qhov muaj kev ntxhov siab, yooj yim heev rau tawg, txawm tias crumple, thiab zais, tsis pom los ntawm nws cov duab. Nws kuj yog induced los ntawm lwm yam tseem ceeb ua rau corrosion. Intergranular corrosion ntawm austenitic stainless hlau los ntawm kev txom nyem yog feem ntau vim yog cov ciam teb ntawm cov nplej Cr, Cr thiab c yooj yim tsim cov tshuaj sib xyaw, cov ntsiab lus Cr.
1, cov tshuaj lom neeg muaj pes tsawg leeg thiab cov qauv
(1) Cov ntsiab lus C
Cov ntsiab lus C ntawm cov hlau cuam tshuam rau kev xeb ntawm cov hlau austenitic stainless hlau yog qhov tseem ceeb tshaj plaws. Ntawm ib sab tes, tswj hwm c kom nruj thiab khaws cov ntsiab lus carbon hauv cov hlau puag thiab cov pas nrig vuam ntawm 0.08%, ntxiv cov khoom ruaj khov xws li Ti, Nb, muaj zog sib raug zoo nrog c rau ntawm cov hlau puag thiab cov khoom siv vuam, thiab cov pa roj carbon ua ntej Cr khi, ua rau muaj cov khoom ruaj khov.
(2) cov qauv theem ob
Cov qauv ob theem yuav ua rau muaj peev xwm tiv taus kev xeb intergranular ntau ntxiv. Ntawm ib sab tes, koom nrog cov khoom siv ferrite, xws li chromium, Silicon, txhuas, molybdenum, thiab lwm yam, tsim cov qauv ob theem vuam, ntawm tus neeg sawv cev tsim uas xaiv los ntawm cov khoom siv vuam uas muaj ferrite ntau dua.
2, kev siv tshuab vuam
(1) Qhov kub ntawm 450 ~ 850 ℃, tshwj xeeb tshaj yog thaum 650 ° c yog qhov yooj yim tshaj plaws los tsim qhov chaw kub txaus ntshai ntawm kev xeb intergranular (tseem hu ua qhov chaw kub rhiab heev). Kev vuam hlau tsis xeb, kev vuam tuaj yeem ua rau hauv qab laminate, lossis ncaj qha rau hauv qab dej txias ntawm qhov vuam, kom txias sai, txo lub sijhawm hauv qhov kub thiab txias, yog cov kev ntsuas zoo rau kev txhim kho kev tiv thaiv xeb ntawm cov pob qij txha.
(2) kev nce ntawm lub zog ntawm txoj kab vuam, yuav ua rau cov hlau austenitic stainless hlau xeb sai dua. Thaum lub sijhawm vuam, nrog rau qhov tam sim no qis, qhov ceev vuam siab, luv-arc, ntau txoj kev vuam dhau, thiab txo qhov kub. Cov cua sov nkag tsawg, los ntawm kev ua kom kub sai txaus kom tsis txhob muaj kev xeb intergranular ntawm thaj chaw cuam tshuam los ntawm cua sov.
Lub sijhawm tshaj tawm: Lub Peb Hlis-12-2018