Hnav-resistant phaj yog ib hom super austenitic stainless hlau nrog siab chromium, npib tsib xee, molybdenum thiab ultra-low carbon. Txij li thaum xyoo 1980s, cov hlau tsis muaj steel nrog nws zoo heev corrosion kuj thiab siab zog tau dav siv nyob rau hauv seawater desalination, pulp bleaching, tshuaj lom neeg kev lag luam thiab lwm yam. Nyob rau hauv xyoo tas los no, nrog rau kev xav tau ceev ceev ntawm cov khoom siv hluav taws xob hauv tsev, ntau cov kev tshawb fawb tau ua nyob rau hauv Suav teb, tab sis lawv feem ntau tsom rau kev tiv thaiv corrosion tom qab kev kho cua sov, thiab cov kev tshawb fawb tseem ceeb ntawm cov khoom siv kho mob. theem yog tsawg. Txij li thaum cov tshuaj kho yog ib qho tseem ceeb heev rau hnav-resistant phaj kom tau tiav cov qauv austenitic, txiav txim siab cov txheej txheem tom ntej thiab tau txais kev txhim kho corrosion zoo dua, cov teebmeem ntawm kev kho cov qauv thiab cov khoom siv ntawm cov phaj hnav-resistant tau kawm hauv daim ntawv no.
Hauv qhov kev sim no, JFE-C400 cov phaj hnav-tiv taus tsim los ntawm JFE tau ua rau hauv qhov khoob los ntawm forging thiab extrusion. Nws cov microstructure tau ua tiav austenite, thiab nws cov tshuaj muaj pes tsawg leeg yog (ntau seem, %): 0.014C, 19.70Cr, 18.31Ni, 6.08Mo , 0.19N, 0.66Cu, 0.59Mn, 0.55Si, 0.014P, 0.0008S, cov npoo yog Fe. Cov pob zeb tau raug kho nrog cov tshuaj tov hauv Muffle rauv ntawm qhov kub sib txawv (900, 950, 1000, 1050, 1100, 1150, 1200, 1250 thiab 1300 degree), tuav rau 1h ntawm txhua qhov ntsuas kub, thiab tom qab ntawd dej quenched.
Kev kho mob muaj txiaj ntsig zoo rau cov qoob loo loj ntawm cov phaj hnav-resistant. Cov nplej tau loj hlob ib txwm thiab lub zog ua kom muaj zog ntawm cov qoob loo loj hlob yog 152kJ / mol thaum lub sij hawm kev kho mob hauv qhov ntsuas kub. Thaum qhov kev daws teeb meem qis dua 1100 degree, σ theem pom nyob rau hauv cov phaj hnav-resistant. Nrog rau qhov txo qis ntawm kev daws qhov kub thiab txias, σ theem nce sai, thiab χ theem thiab lwm theem kuj tshwm sim, uas ua rau cov yas thiab tawv tawv ntawm cov hlau txo qis heev. Cov theem precipitated ploj thaum cov tshuaj kub tshaj 1150 degree. Thaum cov kev daws teeb meem kub siab tshaj 1150 degree, cov khoom siv ntawm cov phaj hnav-resistant yog ruaj khov. Xav txog qhov cuam tshuam ntawm cov yam ntxwv xws li qib ntawm cov khoom siv tshuaj, cov qoob loo loj thiab cov khoom siv hluav taws xob ntawm cov phaj hnav-resistant, nws tau pom zoo tias qhov kev daws teeb meem zoo tshaj plaws ntawm cov phaj hnav-resistant yog 1150 ~ 1250 degree.
