Kev tshawb fawb Status ntawm hlau hnav-resistant cov ntaub ntawv (一)
Hlau hnav-resistant cov ntaub ntawv muaj ob qho tib si cov ntaub ntawv yas thiab cov ntaub ntawv nkig. Tam sim no, muaj cov khoom siv dav siv hauv qab no.
(1) Austenitic hnav-resistant manganese steel Austenitic manganese hlau paub txog nws qhov siab toughness thiab yooj yim hardening. Tam sim no, cov austenitic manganese steel tseem yog tsim los ntawm Mnl3 series, thiab nws cov tshuaj muaj pes tsawg leeg yog:=1 0 feem pua ~ 1.4 feem pua ,=11 feem pua ~ 14 feem pua . Tom qab 1000 ~ 1050 feem pua dej toughened kho, ib qho austenitic qauv tuaj yeem tau txais. Txog tam sim no, austenitic manganese hlau tseem yog siv nyob rau hauv kev cuam tshuam loj ntawm kev thauj khoom abrasive hnav (xws li dov mortar phab ntsa thiab tawg phab ntsa ntawm lub khob hliav qab crusher, ncig crusher hauv ob sab phlu, loj thiab nruab nrab-qhov loj me crusher hauv ob sab phlu, loj rauj crusher rauj taub hau, thiab loj thiab nruab nrab ntub mine pob zeb hauv ob sab phlu). Nyiv thiab lwm lub teb chaws nyiam Mnl3Cr2 hnav-tiv taus hlau nrog ntau zog tawm los thiab hnav tsis kam. Nyob rau xyoo 1950 txog xyoo 1960, cov hlau manganese siab yuav luag siv los ua cov khoom siv universal hnav-resistant. Txawm li cas los xij, hauv kev xyaum ua ntau lawm, nws tau pom tias cov hlau manganese siab tau hnav-tiv taus tsuas yog nyob rau hauv cov xwm txheej ntawm kev cuam tshuam loj, kev ntxhov siab thiab nyuaj abrasive, thiab nws lub zog tawm los yog qis thiab yooj yim rau deformation.
Nyob rau hauv xyoo tas los no, kev kawm tau zoo ntawm austenitic manganese steel feem ntau tshwm sim hauv kev tswj hwm nruj ntawm cov ntsiab lus ntawm Si thiab P uas cuam tshuam rau kev ua haujlwm hauv cov txheej txheem tsim khoom, tshwj xeeb tshaj yog txwv cov ntsiab lus ntawm P; Tsis tas li ntawd, txhawm rau txo cov slag suav nrog, columnar siv lead ua thiab grain coarseness tshwm sim, V, NI, RE thiab lwm yam kab kawm feem ntau ntxiv rau cov hlau manganese siab. Mnl7 (Mnl8) thiab Mn25, lub npe hu ua ultra-high manganese steel, yog qhov tsim nyog los daws cov teeb meem uas carbides yooj yim tshwm sim nyob rau hauv sab hauv ntawm cov tuab thiab loj seem manganese steel tom qab ua kua toughness kho thiab daws qhov teeb meem uas manganese hlau yuav yuav nkig thaum siv ntawm qhov kub thiab txias. Txawm li cas los xij, kev hnav tsis kam thiab cov nqi ua haujlwm ntawm ultra-siab manganese steel nyob rau hauv cov khoom siv abrasive nyob rau hauv kev cuam tshuam loj, kev xaiv ntawm Mn, C thiab Mn / C cuam tshuam nrog / 6 tsis muaj, tshwj xeeb tshaj yog lub neej tsis tshua muaj kev ntxhov siab hnav thiab lwm yam tseem ceeb. cov teeb meem tseem yuav tsum tau kawm tob, thiab kev xyaum ua pov thawj ntawm kev siv dav hauv kev ua haujlwm sib txawv.
(2) Txoj kev loj hlob ntawm hnav-resistant dawb cam khwb cia hlau txawv teb chaws yog muab faib ua peb theem: zoo tib yam dawb cam khwb cia hlau, nickel hard cam khwb cia hlau thiab siab chromium dawb cam khwb cia hlau. Cov chromium dawb cam khwb cia hlau tseem yog lub ntsiab ntawm hnav-resistant cam khwb cia hlau hauv tsev thiab txawv teb chaws. Crl5, Cr20, Cr26 series ntawm high chromium hnav-resistant cam khwb cia hlau tau raug tsim thiab siv nyob rau hauv lub tebchaws United States, Nyiv thiab peb lub teb chaws. Kev hnav-tiv taus cam khwb cia hlau ntawm nruab nrab chromium silicon thiab tsawg chromium hnav-tiv thaiv cam khwb cia hlau haum rau daim ntawv thov cam khwb cia yog kawm nyob rau hauv siab chromium cam khwb cia hlau nyob rau hauv peb lub teb chaws, uas tau loj-tsim thiab muaj daim ntaub ntawv.
Lub microstructure ntawm siab chromium cam khwb cia hlau tom qab solidification yog (Fe, Cr) C hom carbide thiab theem. Thaum lub matrix yog tag nrho martensite, hnav tsis kam ntawm no alloy yog qhov zoo tshaj plaws. Yog tias muaj cov austenite residual hauv matrix, kev kho cua sov feem ntau yuav tsum tau ua. Piv nrog cov dawb El cam khwb cia hlau, tsis tshua muaj chromium alloy dawb cam khwb cia hlau muaj kev ruaj ntseg zoo ntawm carbide. Nyob rau hauv txoj kev kawm ntawm chromium dawb cam khwb cia hlau, nws yog feem ntau txiav txim siab hais tias qhov nyuaj dua hnav resistant. Nyob rau hauv qhov tseeb, qhov muag tsis pom kev ntawm hardness tsis tas yuav ua tiav cov txiaj ntsig zoo, tab sis yuav ua rau tus nqi nce ntxiv, ua rau cov khoom pov tseg. Kev ntsuam xyuas tau pom tias siab chromium cam khwb cia hlau nyob ze rau 90. Thaum angular yaig hnav, nws hnav tsis kam yog phem tshaj 20 steel.
