Yog vim li cas rau Vuam Cracking Ntawm 304 Stainless hlau yeeb nkab

Vuam yog qhov txuas tseem ceeb hauv kev ua hlau thiab yog siv dav hauv ntau qhov chaw. Tsuas yog los ntawm kev ua kom cov khoom zoo tuaj yeem txhim kho kev nyab xeeb ntawm cov khoom. Txawm li cas los xij, vuam qhov tsis xws luag yog qhov tsis zoo tshaj plaws hauv kev tsim khoom. Cov kab nrib pleb yog qhov tsis zoo thiab txaus ntshai uas tsis yog tsuas yog ua rau cov khoom tawg, tab sis kuj tuaj yeem ua rau muaj xwm txheej loj. Yog li ntawd, nws yog ib qho tsim nyog yuav tsum paub txog qhov ua rau vuam tawg hauv 304 stainless hlau kav.
Nyob ntawm qhov kub thiab lub sijhawm tshwm sim, cov kab nrib pleb tuaj yeem muab faib ua cov kab tawg kub, cov kab nrib pleb txias, kev ntxhov siab corrosion thiab delamination kua muag. Qhov chaw ntawm kev sib tsoo thaum lub sij hawm vuam yog txawv. Cov kab nrib pleb yog pom ntawm qhov chaw vuam thiab pom ntawm qhov muag liab qab; qee qhov tuaj yeem muab zais rau hauv qhov vuam thiab tuaj yeem pom los ntawm qhov tsis zoo; qee qhov nyob rau ntawm qhov vuam thiab qee qhov yog nyob rau hauv qhov chaw muaj kev kub ntxhov. Nws yuav tsum raug sau tseg tias qee zaum cov kab nrib pleb tshwm sim thaum lub sijhawm vuam, thiab qee zaum cov kab nrib pleb tshwm tom qab muab tso rau hauv lossis khiav mus rau lub sijhawm tom qab vuam. Hom tom kawg yog hu ua ncua kev tawg thiab muaj teeb meem.
Thermal Cracks
Vim tias nws crystallizes ntawm qhov kub thiab txias thiab tawg raws cov ciam teb, nws tseem hu ua crystallization tawg. Microscopically, cov kab nrib pleb yog tus cwj pwm los ntawm kev tawg ntawm intergranular, thiab oxidation xim dominates qhov tawg. Qhov no yog vim qhov tshwm sim ntawm kev sib cais ntawm lub pas dej ua ke thaum lub sij hawm crystallization txheej txheem, thiab cov precipitates feem ntau yog qis-melting-point eutectics thiab impurities. Nws yog cov txheej txheem ua kua thaum crystallized, thiab lub zog kub-kub kuj tseem qis heev thaum crystal solidifies. Nyob rau hauv tej yam kev mob, thaum lub vuam tensile kev nyuaj siab yog siab, lub yaj yuav sib cais los yog tawg nyob rau hauv cov khaubncaws sab nraud povtseg, ua rau cov yaj mus yaj.
Txias Crack
Feem ntau tshwm sim nyob rau hauv lub tshav kub cuam tshuam cheeb tsam thiab tej zaum nyob rau hauv lub vuam hlau. Txias cracking mas manifests li tawg nyob rau hauv cov nplej, lub pob txha tawg tsis muaj oxidation xim, thiab pob txha nto yog ci.
Siab Corrosion Cracking
Lub ncua kev puas tsuaj ntawm 304 stainless hlau yeeb nkab nyob rau hauv qhov kev txiav txim ntawm ib co tshwj xeeb xov xwm thiab tensile kev nyuaj siab tsis muaj ib tug pom tseeb cov yam ntxwv corrosion kab, thiab pom kev nyuaj siab corrosion tawg yog tawg thiab discontinuities. Ntawm qhov chaw vuam, feem ntau ntawm cov kab nrib pleb yog transverse. Thaum muaj kev ntxhov siab corrosion tshwm sim hauv cov hlau, lawv cov duab zoo ib yam li cov cag ntoo, thiab cov duab tawg yog ib qho kev tawg ntawm cov pob txha. Rau austenitic stainless hlau, vim muaj kev sib txawv corrosion media, qhov ntawm cov kab nrib pleb kuj yuav hloov, xws li intergranular tawg, los yog sib tov ntawm transgranular thiab intergranular tawg. Hauv chlorinated xov xwm, kev ntxhov siab corrosion tawg ntawm austenitic stainless hlau yog transgranular tawg.
Nrog rau txoj kev loj hlob ntawm vuam tshuab, ntau yam tsis zoo yuav tshwm sim hauv cov khoom siv tiag tiag. Yog li ntawd, cov welders yuav tsum paub txog cov yam ntxwv ntawm 304 stainless hlau kav, cov khoom siv vuam, cov txheej txheem vuam thiab cov txheej txheem kev ua haujlwm, muaj kev nkag siab tob txog kev ntsuas kev nyab xeeb, nruj me ntsis siv cov txheej txheem kev ua haujlwm, thiab ua raws li kev tiv thaiv kev tiv thaiv.