Multilateralized Cracks
Nyob rau hauv lub solidified crystallization pem hauv ntej, nyob rau hauv qhov kev txiav txim ntawm kub thiab kev ntxhov siab, lub lattice defects txav thiab aggregate mus rau ib tug thib ob ciam teb, uas yog nyob rau hauv ib tug uas tsis muaj yas lub xeev ntawm kub kub, thiab cov kab nrib pleb yog generated nyob rau hauv qhov kev txiav txim ntawm kev ntxhov siab. Cov kab nrib pleb feem ntau tshwm sim nyob rau hauv cov welds ntawm cov hlau ntshiab los yog ib-theem austenitic alloys los yog nyob ib ncig ntawm lub seam, thiab lawv yog hom kub tawg.
Rov qab Cracks
Rau steels nrog tuab-phaj welded qauv thiab qee cov nag lossis daus-lub zog alloying cov ntsiab lus, cov kab nrib pleb uas tshwm sim hauv cov coarse-grained qhov chaw ntawm vuam kub-tshuaj tiv thaiv cheeb tsam thaum muaj kev ntxhov siab los ntawm kev kho cua sov los yog kev pab cuam ntawm qhov kub thiab txias yog hu ua reheat cracks. Reheat tawg feem ntau tshwm sim nyob rau hauv coarse-grained qhov chaw ntawm vuam tshav kub-cuam tshuam cheeb tsam ntawm low-alloy high-strength steels, pearlitic tshav kub-resistant steels, austenitic stainless hlau thiab ib co nickel-raws li alloys.
Txias tawg
Cov kab nrib pleb txias yog ib hom kab nrib pleb uas ua rau vuam, uas yog tsim thaum qhov kub thiab txias kom qis dua tom qab vuam. Cov kab nrib pleb txias feem ntau tshwm sim nyob rau hauv cov vuam kub cuam tshuam cheeb tsam ntawm cov hlau tsis tshua muaj hlau, nruab nrab alloy hlau, nruab nrab carbon thiab siab carbon steel. Nyob rau hauv ib tug neeg mob, xws li thaum welding ultra-high-strength steels los yog tej yam titanium alloys, txias tawg kuj tshwm sim nyob rau hauv lub vuam hlau.
Raws li cov hlau sib txawv thiab cov qauv yuav tsum tau welded, kuj tseem muaj ntau hom kev sib txawv ntawm cov kab nrib pleb, uas tuaj yeem muab faib ua peb pawg hauv qab no:
Ncua sijhawm Crack
Nws yog ib hom kab mob khaub thuas. Nws lub ntsiab feature yog hais tias nws tsis tshwm sim tam sim ntawd tom qab vuam, tab sis muaj ib tug dav incubation lub sij hawm, thiab yog ib tug tawg nrog qeeb cov yam ntxwv generated nyob rau hauv lub sib xyaw ua ke ntawm hardened qauv, hydrogen thiab restraint kev nyuaj siab.
Quenching Cracks
Qhov zoo ntawm qhov tawg no yeej tsis ncua, nws pom tam sim ntawd tom qab vuam, qee zaum nws tshwm sim hauv qhov vuam, qee zaum nws tshwm sim hauv thaj chaw tshav kub. Feem ntau muaj cov qauv hardened, cov kab nrib pleb generated nyob rau hauv qhov kev txiav txim ntawm vuam kev nyuaj siab.
Tsawg yas embrittlement Crack
Rau qee cov ntaub ntawv uas tsis tshua muaj plasticity, thaum txias mus rau qhov kub thiab txias, lub zog los ntawm lub shrinkage quab yuam tshaj cov yas cia ntawm cov khoom nws tus kheej los yog cov kab nrib pleb tshwm sim los ntawm cov khoom ua nkig. Vim tias nws yog tsim los ntawm qhov kub thiab txias, nws kuj yog lwm hom kab mob khaub thuas, tab sis tsis muaj qhov tshwm sim qeeb.
Laminar kua muag
Nyob rau hauv cov txheej txheem ntawm cov roj ntau lawm platforms thiab tuab-walled siab hlab ntsha, kauj ruam tawg mus rau lub dov kev taw qhia tej zaum kuj tshwm sim, thiaj li hu ua laminar tearing.
Feem ntau yog vim muaj cov txheej txheem sib xyaw ua ke (raws li qhov kev taw qhia dov) hauv cov phaj steel, qhov kev ntxhov siab tsim tawm thaum lub sij hawm vuam yog perpendicular mus rau dov kev taw qhia, uas ua rau ib tug "stepped" txheej txheej nyob rau hauv lub tshav kub-cuam tshuam cheeb tsam deb ntawm qhov hluav taws kub. tawg.
Kev nyuaj siab Corrosion Cracking
Kev ncua kev tawg ntawm qee cov qauv welded (xws li cov hlab ntsha thiab cov kav dej) nyob rau hauv kev sib xyaw ua ke ntawm corrosive media thiab kev ntxhov siab. Cov yam ntxwv cuam tshuam rau kev ntxhov siab corrosion cracking muaj xws li cov khoom siv ntawm cov qauv, hom corrosive nruab nrab, cov qauv ntawm cov qauv, kev tsim thiab vuam txheej txheem, cov khoom siv vuam, thiab qib ntawm kev ntxhov siab. Kev ntxhov siab corrosion tshwm sim thaum ua haujlwm.
Lub sij hawm xa tuaj: Plaub Hlis-24-2022