Kev Ua Haujlwm Ntawm Alloying Elements hauv P91 Alloy Yeeb Nkab

P91 alloy tube nyob rau hauv cov ntsiab lus alloy ua si ib qho kev daws teeb meem ntxiv dag zog, diffusion ntxiv dag zog thiab txhim kho oxidation tsis kam ntawm hlau, corrosion kuj, tshwj xeeb soj ntsuam raws li hauv qab no.

① carbon yog cov khoom siv hlau ua kom muaj zog ntawm cov ntsiab lus pom tseeb tshaj plaws, nrog rau kev nce hauv cov ntsiab lus carbon, lub sij hawm luv luv ntawm cov hlau, plasticity, toughness poob, xws li P91 martensitic steel, qhov nce hauv cov ntsiab lus carbon yuav ua kom ceev ceev. ntawm carbide spheroidization thiab aggregation kom ceev lub redistribution ntawm alloying ntsiab, txo cov weldability ntawm cov hlau, corrosion kuj thiab oxidation kuj, tshav kub-resistant steel feem ntau. vam tias yuav txo qis cov ntsiab lus carbon, tab sis cov ntsiab lus carbon tsawg dhau, lub zog ntawm cov hlau yuav raug txo. P91 steel piv nrog 12Cr1MoV steel, carbon cov ntsiab lus los ntawm 20%, uas yog ib qho kev txiav txim siab ntawm qhov cuam tshuam ntawm cov ntsiab lus saum toj no thiab txiav txim siab.

② P91 steel muaj cov cim ntawm nitrogen, nitrogen lub luag hauj lwm yog xav txog ob yam. Ntawm qhov tod tes, lub luag haujlwm ntawm cov tshuaj tiv thaiv kom muaj zog, nitrogen ntawm chav sov hauv cov hlau solubility yog me me, P91 steel welded tshav kub cuam tshuam cheeb tsam hauv vuam cua sov thiab tom qab vuam txheej txheem kev kho cua sov, yuav muaj kev sib txuas ntawm cov khoom. kev daws teeb meem thiab nag lossis daus txheej txheem ntawm VN: welded cua sov tshav kub-tshem tawm tsam tau tsim nyob rau hauv lub koom haum austenitic vim lub solubility ntawm VN, cov ntsiab lus nitrogen nce, thiab Tom qab ntawd lub degree ntawm supersaturation nyob rau hauv lub koom haum ntawm chav tsev kub nce nyob rau hauv lub tom ntej no tshav kub kev kho mob ntawm weld muaj me me VN nag lossis daus, uas ua rau kom lub stability ntawm lub koom haum thiab txhim kho tus nqi ntawm lub zog ntev ntawm lub tshav kub cuam tshuam cheeb tsam. Ntawm qhov tod tes, P91 steel kuj muaj me me ntawm A1, nitrogen thiab nws tsim ntawm A1N, A1N nyob rau hauv ntau tshaj 1 100 degree tsuas yog ib tug loj tus naj npawb ntawm yaj nyob rau hauv lub matrix, thiab nyob rau hauv qis kub thiab rov los nag. , tuaj yeem ua si zoo dua diffusion ntxiv zog.

③ ntxiv chromium yog tsuas yog los txhim kho cov oxidation tsis kam ntawm cov hlau uas kub-resistant, corrosion kuj, chromium cov ntsiab lus tsawg dua 5%, 600 degree pib oxidize hnyav, thaum cov ntsiab lus chromium nce rau 5% muaj oxidation zoo. 12Cr1MoV steel ntawm 580 degree hauv qab no muaj kev tiv thaiv zoo rau oxidation, qhov tob ntawm corrosion ntawm 0.05 mm / a, 600 degree thaum qhov kev ua tau zoo pib deteriorate, qhov tob ntawm corrosion yog 0.13 mm / a. P91 chromium cov ntsiab lus nce mus txog 9%, kev siv qhov kub thiab txias tuaj yeem ncav cuag 650 degree, qhov kev ntsuas tseem ceeb yog ua kom cov matrix yaj hauv ntau chromium.

④ Vanadium thiab niobium yog cov muaj zog carbide-tsim cov ntsiab lus, ntxiv rau tsim ib qho zoo thiab ruaj khov alloy carbide nrog cov pa roj carbon, muaj zog diffusion ntxiv zog.

⑤ Qhov sib ntxiv ntawm molybdenum feem ntau yog los txhim kho cov thermal zog ntawm cov hlau, cov khoom muaj zog ntxiv.