1.Dab tsi yog macroscopic morphological yam ntxwv ntawm ob daim tawv nqaij tsis xws luag? Yuav ua li cas thaum xub thawj pom lawv qhov muag liab qab?
Morphological yam ntxwv:
Tus nplaig- zoo li tus los yog scaly: Qhov tsis xws luag tshwm sim raws li cov txheej txheem nyias nyias ntawm cov hlau tev tawm, ib kawg txuas nrog lub substrate thiab lwm qhov kawg dawb, zoo li tus nplaig lossis ntses nplai.
Sawb-zoo li kev faib tawm: Feem ntau tshwm sim raws li strips lossis blocks, tsis tu ncua lossis tsis tu ncua faib raws li qhov kev taw qhia dov.
Ntug curling: Hauv qhov xwm txheej hnyav, ntug ntawm daim tawv nqaij tuaj yeem nqa tau me ntsis, txawm tias nthuav tawm cov voids lossis oxide nplai.
Xim thiab luster:
Sab hauv ntawm daim tawv nqaij tev tawm (qhov chaw nyob rau hauv kev sib cuag nrog lub substrate) feem ntau yog tsaus grey los yog tsaus xim av, vim oxidation tshwm sim los ntawm huab cua nkag mus rau qhov khoob thaum kub dov los yog kub ua hauj lwm.
Lub ntsej muag ib txwm yuav tsum muaj cov xim hlau zoo sib xws (tom qab txias dov thiab annealing) lossis nyiaj - grey.
Tactile soj ntsuam:
Maj mam khawb qhov tsis xws luag nrog ib tug ntiv tes los yog ib qho khoom ntse yuav qhia tau ib qho kev pom ntawm ntug. Qee lub sij hawm, kev txhuam maj mam tuaj yeem tev tawm ntawm daim tawv nqaij, tawm hauv lub qhov dej ntawm lub substrate tom qab tev tawm.
2.Dab tsi yog qhov chaw ntawm cov tawv nqaij hnyav ntawm qhov txias -rolled coils?
Ntug cheeb tsam (feem ntau):
Kwv yees li ntawm 70% ntawm qhov hnyav- kab xev tsis xws luag nyob rau ntawm ob sab ntawm lub sawb dav (hauv 10-50 hli ntawm ntug).
Ua rau: Thaum lub sij hawm dov, cov npoo ntawm kub -rolled slabs muaj qhov kub thiab txias poob sai thiab nyuaj nyuaj. Yog tias muaj cov kab nrib pleb los yog cov npoo npoo, tom qab ntau qhov dov hla, cov hlau yog flattened thiab folded rau saum npoo, sib sau strip -zoo li tev ntawm ntug.
Txhua Qhov Chaw (Center lossis 1/4):
Yog hais tias qhov tsis xws luag yog los ntawm cov npuas subcutaneous los yog loj inclusions nyob rau hauv lub slab, thaum lub sij hawm dov, cov npuas rupture thiab cov inclusions yog crushed thiab txuas ntxiv, ua rau hnyav - strip defects tshwm sim nyob rau hauv txhua qhov chaw raws lub strip lub dav, txawm nyob rau hauv nruab nrab.
Head thiab Tail Sections:
Lub taub hau thiab tus Tsov tus tw ntawm cov kub- dov coils feem ntau muaj qhov tshwm sim ntau dua ntawm qhov hnyav- strip defects tshaj qhov nruab nrab ntu vim yog yam xws li kev cuam tshuam ntawm cov hlau tom thaum dov, qhov kub tsis sib xws, thiab kev sib tsoo tsis zoo.
3.Yuav ua li cas yooj yim ntawm - qhov chaw kuaj (xws li polishing thiab kua qaub ntxuav) yuav siv tau los pab txheeb xyuas re- tawv tawv?
Sib tsoo nrog lub log abrasive:
Kev Ua Haujlwm: Siv lub log abrasive los yog lub kaum sab xis grinder los zom cov kab rov tav (perpendicular mus rau dov kev taw qhia) los yog longitudinally, nrog kev sib tsoo qhov tob ntawm kwv yees li 0.2 ~ 0.5mm.
Kev txheeb xyuas:
Yog hais tias nws yog ib qho tawg los yog khawb, cov kev sib tsoo feem ntau yuav ploj mus lossis ua ntiav tom qab sib tsoo.
Yog hais tias nws yog ib txheej ntawm daim tawv nqaij flaked: thaum sib tsoo mus rau ciam teb ntawm daim tawv nqaij flaked thiab lub substrate, delamination los yog qhov khoob yuav pom meej meej; Qee zaum, tom qab cov tawv nqaij flaked yog hauv av, lub qhov dej yuav raug nthuav tawm hauv qab, nrog cov xim tsaus rau hauv qab (xim oxidation) thiab ib thaj tsam meej nrog cov substrate nyob ib puag ncig.
Local acid pickling method:
Kev Ua Haujlwm: Siv cov paj rwb swab los siv cov tshuaj uas tsim nyog (xws li 10% ~ 20% nitric acid cawv lossis hydrochloric acid tov) rau thaj tsam tsis xws luag thiab saib xyuas cov tshuaj tiv thaiv.
Kev txheeb xyuas: Qhov khoob ntawm daim tawv nqaij flakes feem ntau muaj hlau oxide nplai lossis av. Tom qab cov kua qaub pickling, cov hlau nyob ib ncig ntawm qhov tsis xws luag yuav ci dua, thaum cov oxides nyob rau hauv qhov khoob, tom qab corrosion, tej zaum yuav tawm ntau pom tseeb kab dub los yog pits, ua rau qhov tsis xws luag qhia meej.
4.Dab tsi ntawm qhov chaw tsis xws luag (xws li khawb thiab khawb) tuaj yeem yooj yim tsis meej pem nrog ob chav tawv nqaij tsis xws luag? Lawv yuav txawv li cas?
Ob daim tawv nqaij: tus nplaig- zoo li tus lossis txheej, cov npoo tuaj yeem nqa tau. Muaj qhov khoob / txheej, thiab lub qhov dej tshwm hauv qab tom qab nqa.
Kos: Grooves, feem ntau ncaj, nrog dav dav. Tsis muaj txheej txheej, tsuas yog nto grooves.
5.Yog tias lapis laminae xav tias yog tshwm sim los ntawm qhov tsis xws luag sab hauv, yuav tsum tau siv txoj kev kuaj microscopic li cas rau kev pom zoo zaum kawg?
Metallographic Microscopy Analysis:
Kev Npaj Qauv: Txiav ib qho piv txwv rau qhov tsis xws luag, mount nws, thiab tom qab ntawd zom thiab txhuam nws.
Kev soj ntsuam: Saib tus ntoo khaub lig-sectional morphology ntawm qhov tsis xws luag nyob rau hauv lub tshuab tsom. Cov yam ntxwv ntawm lub ntsej muag flaked muaj xws li cov txheej hlau folded thiab muaj qhov sib txawv oxide lossis decarburized txheej. Cov kev suav loj hauv qab kuj yuav pom meej meej.
Scanning Electron Microscopy (SEM) thiab Energy Dispersive Spectroscopy (EDS):
Kev soj ntsuam morphological: Saib xyuas lub microstructure ntawm sab hauv ntawm lub ntsej muag flaked thiab cov pits nyob rau hauv lub matrix nyob rau hauv siab magnification, tab tom nrhiav rau molten lub xeev yam ntxwv (slag entrapment) los yog ib tug khoom qab zib -zoo li tawg nto (nruj tawg).
Compositional Analysis: Ua lub zog dispersive spectroscopy tsom xam ntawm cov seem nyob rau hauv lub flaked nto.
Yog tias cov khoom xws li Na, K, Ca, thiab Si raug kuaj pom, nws qhia tau tias tuaj yeem cuam tshuam los ntawm pwm flux.
Yog tias oxides ntawm Al, Mg, thiab Ca raug kuaj pom, nws qhia tau tias muaj peev xwm deoxidation cov khoom lossis kev sib sau ua ke.
Yog tias FeO yog qhov tseem ceeb, nws qhia tau hais tias hlau oxide nplai tsim thaum ua haujlwm kub tau nias rau hauv.