Martensitic stainless hlau tuaj yeem welded nyob rau hauv lub xeev ntawm annealing, hardening thiab tempering. Tsis hais txog ntawm lub xeev qub ntawm cov hlau, ib qho chaw hardened martensite yog tsim nyob ib sab ntawm cov hlaws vuam tom qab vuam. Lub hardness ntawm tshav kub cuam tshuam cheeb tsam yog nyob ntawm seb cov ntsiab lus carbon ntawm lub hauv paus hlau. Raws li lub hardness nce, lub toughness txo, thiab qhov chaw no yuav ua rau kom tawg. Preheating thiab tswj qhov kub ntawm cov khaubncaws sab nraud povtseg yog qhov zoo tshaj plaws kom tsis txhob tawg. Rau cov khoom zoo tshaj plaws, tom qab-weld kho cua sov yog xav tau.
Martensitic stainless hlau yog ib hom stainless hlau uas tuaj yeem hloov kho los ntawm kev kho cua sov (quenching, tempering). Nyob rau hauv layman cov ntsiab lus, nws yog ib hom hardenable stainless hlau. Cov cuab yeej no txiav txim siab tias cov hlau yuav tsum muaj ob lub ntsiab lus: Ua ntej, yuav tsum muaj thaj tsam austenite nyob rau hauv daim duab equilibrium. Tom qab lub sij hawm ntev ntawm cua sov nyob rau hauv qhov kub thiab txias ntawm thaj av ntawd, cov carbide yog cov khoom zoo - yaj rau hauv cov hlau, thiab tom qab ntawd quenched los ua martensite. Uas yog, cov tshuaj muaj pes tsawg leeg yuav tsum tau tswj nyob rau hauv lub los yog + theem cheeb tsam, thiab qhov thib ob yog ua kom cov alloy tsim ib tug passivation zaj duab xis tiv taus corrosion thiab oxidation, thiab cov ntsiab lus chromium yuav tsum siab tshaj 10.5%. Raws li qhov sib txawv ntawm cov ntsiab lus alloying, nws tuaj yeem muab faib ua martensitic chromium stainless hlau thiab martensitic chromium nickel stainless hlau.
Lub ntsiab alloying ntsiab ntawm martensitic chromium stainless hlau yog hlau, chromium thiab carbon. Yog tias Cr ntau dua 13%, tsis muaj gamma theem, thiab cov alloys no hu ua ib theem ferritic alloys. Nws tsis tsim martensite raws li kev kho cua sov. Rau lub hom phiaj no, austenite tsim cov ntsiab lus yuav tsum tau ntxiv rau sab hauv Fe-Cr binary alloy. Hais txog kev nthuav dav, C thiab N yog cov ntsiab lus zoo, thiab lawv qhov sib ntxiv tso cai rau cov hlau tso cai rau cov ntsiab lus chromium ntau dua. Hauv martensitic chromium stainless hlau, ntxiv rau chromium, C yog lwm qhov tseem ceeb tshaj plaws. Qhov tseeb, martensitic chromium stainless hlau yog ib chav kawm ntawm hlau, chromium thiab carbon ternary alloys. Tau kawg, muaj lwm yam ntsiab lus. Siv cov ntsiab lus no, kwv yees lub koom haum tuaj yeem txiav txim siab los ntawm Schaeffler daim duab.
