1. Stainless hlau yeeb nkab yog hais txog kev soj ntsuam ntawm qhov tsis xws luag ntawm qhov ntev thiab hla ntu ntawm cov hlau nrog lub qhov muag liab qab lossis lub iav magnifying, tseem hu ua macroscopic lub koom haum tshuaj xyuas!
Pickling xeem: kub pickling (7080 degree) thiab txias pickling. Cov kua qaub sib txawv yog siv raws li qib steel sib txawv. Cov ntsiab lus ntawm kev tshuaj xyuas yog tsuas yog qhia qhov xoob, sib cais, npuas, cov pob dawb thiab tsis txo cov hlau hauv cov hlau.
Ntauwd txo qhov zoo li cov plaub hau kev tshuaj xyuas: Lub pej thuam txo cov qauv ntawm qhov loj me yog raug rau cov kua qaub kub dipping, thiab cov kab nrib pleb me me ntawm qhov tsis paub meej ntev thiab qhov tob raws li cov kev taw qhia dov.
Sulfur print test: Cov qauv kuaj yog them nrog cov duab thaij duab nrog 5 feem pua 10 feem pua sulfuric acid aqueous tov, qhia cov xim xim av tsaus nti, uas yog siv los kuaj kom muaj nuj nqis thiab faib cov sulfur hauv cov hlau.
2. Ntxiv nickel caij tuaj yeem hloov ferrite rau hauv austenite los ntawm cov qauv siv lead ua, thiab austenitic stainless hlau tau txais!
Cov hlau no muaj qhov zoo ductility thiab toughness, thiab qhov tseem ceeb tshaj plaws, yog ib qho yooj yim rau kev tsim thiab vuam, thiab tsis txo cov hlau nplaum hauv lub xeev annealed. Cov qib steel feem ntau yog 304 (S304000) lossis 18/8. Nws cuam tshuam ntau dua corrosion txo qhov nruab nrab tiv taus uas yuav tsum tau welded, feem ntau 304L nrog cov ntsiab lus qis dua. Cov qib steel no muaj ntau yam kev siv xws li hauv chav ua noj hauv tsev thiab lub tsev facades mus rau cov khoom siv ua zaub mov thiab cov kav dej hauv cov nroj tsuag tshuaj.
Duplex stainless hlau: Ntawm ferritic thiab austenitic stainless hlau, nws muaj li ntawm 50 feem pua ferrite thiab 50 feem pua austenite. Vim yog cov qauv bidirectional, lawv tiv taus kev ntxhov siab corrosion cracking, hom corrosion uas austenitic stainless hlau tuaj yeem ntsib hauv cov dej kub uas muaj chlorides. Cov hlau tsis zoo tshaj plaws yog 2205 duplex stainless hlau (xws li S31803 thiab S32205), uas yog siv rau hauv ntau daim ntawv thov xws li cov tso dej kub.
Precipitation hardening stainless hlau: Lub zog siab heev yog tau los ntawm kev ntxiv cov ntsiab lus xws li tooj liab, thiab nws cov corrosion kuj yog me ntsis muaj zog dua li ntawm martensitic stainless hlau, tsis zoo li 304. Feem ntau siv hauv aerospace thiab tiv thaiv kev lag luam, thiab kuj siv rau hauv qhov chaw. xws li twj tso kua mis shafts, 17 txo 4PH yog ib hom steel qib.
3. Nws yog ib txoj hauv kev tseem ceeb los tshuaj xyuas qhov tsis xws ntawm macroscopic steel. Nws tuaj yeem siv ua ke nrog acid leaching tshuaj xyuas kom sib ntxiv!
Raws li qhov sib txawv steel hom thiab kev soj ntsuam yuav tsum tau, cov qauv yuav tsum tau kho cua sov nyob rau hauv ntau txoj kev ua ntej kev soj ntsuam, muab faib ua quenched fracture, annealed puas thiab quenched thiab tempered puas, feem ntau quenched puas yog siv. Cov teeb meem xws li cov pob dawb, suav nrog, interlayers, thiab pores tuaj yeem pom ntawm qhov tawg tawg. Annealed fractures yog siv rau cov kabmob steel thiab cov cuab yeej hlau los xyuas qhov sib xws thiab kev ua kom zoo ntawm cov nplej kom pom cov teeb meem xws li graphite carbon nag lossis daus, suav nrog, thiab cov kab noj hniav shrinkage. Lub quenched thiab tempered tawg yog tsuas yog siv rau ob peb steels, thiab cov qauv fibrous ntawm qhov tawg tuaj yeem cuam tshuam cov khoom siv ntawm cov hlau mus rau qee yam.
Ntawd yog, kev tshuaj xyuas microstructure yog ib txoj hauv kev tshuaj xyuas los soj ntsuam thiab txheeb xyuas sab hauv ntawm cov hlau nrog lub tshuab tsom iav nrog qhov loj ntawm 100 txog 2000 zaug. Cov ntsiab lus tshuaj xyuas muaj xws li tsis txo cov hlau sib xyaw, cov qauv banded, carbide inhomogeneity, carbonized kua deposition, qhov tob ntsuas ntawm decarburized txheej, kev ntsuam xyuas ntawm spherical qauv, kev ntsuam xyuas ntawm lub network qauv thiab kev ntsuam xyuas ntawm austenite grain loj.
Nws kuj yog ib qho kev tshuaj xyuas zoo, uas yog los soj ntsuam thiab txheeb xyuas cov hlau sab hauv nrog lub tshuab ntsuas hluav taws xob nrog qhov loj ntawm ntau txhiab zaus mus rau ntau pua txhiab zaus.
Tsis tas li ntawd, tseem muaj cov txheej txheem tshuaj xyuas microstructure xws li kev txiav txim siab ntawm cov qauv siv lead ua ntawm ntau theem hauv cov hlau thiab cov hlau los ntawm X txo cov duab hluav taws xob diffraction, thiab kev tshuaj xyuas cov tshuaj lom neeg hauv cheeb tsam microscopic los ntawm electron probes.
