Kev tshawb fawb txog cov khoom siv hlau hnav-resistant (I)
Cov khoom siv hlau hnav-tiv taus muaj cov ntaub ntawv yas thiab cov ntaub ntawv tawv tawv, uas tau siv dav raws li hauv qab no.
(1) Austenitic hnav-resistant manganese steel Austenitic manganese hlau paub txog nws qhov siab toughness thiab yooj yim hardening. Cov austenitic manganese steel uas tsim thiab siv rau sab hauv thiab sab nraud tseem yog 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 ntawm cov dej toughening kev kho mob, ib tus qauv austenitic 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 hnyav hnyav (xws li dov mortar phab ntsa thiab tawg phab ntsa ntawm lub khob hliav qab crusher, hauv ob sab phlu ntawm teb crusher, hauv ob sab phlu ntawm loj thiab nruab nrab-qhov loj me crusher, rauj crusher rauj taub hau. , thiab hauv ob sab phlu ntawm qhov loj thiab nruab nrab ntub dej mine pob zeb). 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 thiab 1960, cov hlau manganese siab yuav luag siv los ua cov khoom siv thoob ntiaj teb, tab sis hauv kev xyaum ua, nws tau pom tias tsuas yog nyob rau hauv cov xwm txheej loj, kev nyuaj siab thiab nyuaj abrasive, siab manganese hlau yog hnav-resistant. , thiab nws lub zog tawm los yog tsawg thiab yooj yim rau deformation.
Kev kawm txuj ci ntawm austenitic manganese hlau yog 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, V, NI, RE thiab lwm yam kab kawm feem ntau ntxiv rau siab manganese hlau. 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 rau sab hauv ntawm cov tuab thiab loj seem manganese steel tom qab ua kua toughness thiab txo cov toughness. Lawv kuj yog qhov tsim nyog los daws qhov teeb meem uas manganese steel yuav nkig thaum siv 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 cov kev cuam tshuam loj, kev xaiv ntawm Mn, C thiab Mn / C cuam tshuam rau qhov tsis muaj / 6, tshwj xeeb tshaj yog lub neej tsis tshua muaj kev nyuab siab hnav thiab Lwm cov teeb meem tseem ceeb yuav tsum tau kawm ntxiv, thiab kev xyaum ua pov thawj ntawm kev siv dav hauv kev ua haujlwm sib txawv.
(2) Txoj kev loj hlob ntawm hnav-resistant chromium dawb cam khwb cia hlau txawv teb chaws yog muab faib ua peb theem: zoo tib yam dawb cam khwb cia hlau, nickel nyuaj cam khwb cia hlau thiab siab chromium dawb cam khwb cia hlau. 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 yog loj-tsim thiab siv nyob rau hauv America, Nyiv thiab peb lub teb chaws. Wear-resisting cam khwb cia hlau ntawm nruab nrab chromium silicon thiab hnav-tiv taus cam khwb cia hlau uas tsis muaj chromium haum rau casting daim ntawv thov yog kawm nyob rau hauv peb lub teb chaws raws li high chromium cam khwb cia hlau, 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. Kev ruaj ntseg ntawm carbide nyob rau hauv tsawg chromium alloy dawb cam khwb cia hlau yog zoo dua li nyob rau hauv zoo tib yam dawb El cam khwb cia hlau. 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 kom tus nqi ntau, ua rau cov khoom pov tseg. Kev ntsuam xyuas tau pom tias muaj cov chromium cam khwb cia hlau siab nyob ze ntawm 90. Thaum lub kaum sab xis hnav, nws hnav tsis kam yog qhov phem dua li ntawm 20 steel.
