1.Dab tsi yog lub tshuab uas suav nrog ua rau tawg hauv txias-khoov coils?
Cov txheej txheem tseem ceeb uas suav nrog ua rau tawg yog qhov cuam tshuam ntawm matrix txuas ntxiv, dhau los ua qhov chaw ntawm kev ntxhov siab.
Stress Concentration: Lub plasticity ntawm non{0}}metallic inclusions (xws li oxides, sulfides, silicates, thiab lwm yam) yog feem ntau qis dua cov hlau matrix. Thaum lub sij hawm txias dov los yog tom qab stamping, tsis tshua muaj kev ntxhov siab concentration tshwm sim ntawm qhov sib cuam tshuam ntawm kev suav nrog thiab matrix.
Microcrack Initiation: Thaum qhov kev ntxhov siab tshaj qhov kev sib txuas ntawm lub zog, qhov kev suav nrog nws tus kheej yuav tawg los yog tev tawm ntawm matrix, tsim microcracks.
Crack Propagation: Nyob rau hauv kev nruam sab nraud, cov microcracks yuav nthuav tawm thiab txuas. Tshwj xeeb tshaj yog thaum cov kev sib koom ua ke tau muab faib rau hauv cov saw hlau-zoo li los yog cov qauv banded, cov kab nrib pleb yuav nthuav tawm sai sai raws li thaj chaw sib sau ua ke, thaum kawg ua rau macroscopic cracking.
2.Dab tsi yog qee qhov tiag -cov piv txwv hauv ntiaj teb no uas qhia tau tias kev suav nrog tuaj yeem ua rau txias- cov coils ua kom tawg lossis tawg?
Cold Rolling Strip Breakage: Kev txheeb xyuas los ntawm Xinjiang Baosteel hais txog kev sib tsoo tawg hauv nws cov tshuab txias dov qhia tias cov teeb meem ntawm cov khoom siv raw (feem ntau suav nrog) suav txog 88.6% ntawm tag nrho cov kev tawg. Electron microscopy tsom xam pom tau hais tias muaj pes tsawg leeg ntawm inclusions ntawm lub pob txha tawg yog zoo ib yam li cov pwm flux nyob rau hauv lub crystallizer, paub meej tias lub breakage yog tshwm sim los ntawm slag entrapment thaum lub sij hawm nruam casting txheej txheem.
Ntug Kev puas tsuaj: Ib lub zeb zeb steel SPHC txias- cov khoom siv dov tau nthuav tawm ntug kev puas tsuaj. Kev tshawb fawb tau qhia tias qhov ua rau yog cov ntsiab lus siab ntawm hom B (Al₂O₃) suav nrog hauv cov hlau, ua rau micro- tawg ntawm ntug slab ua ntej dov. Cov kab nrib pleb no tom qab tawg thiab nthuav dav tom qab yob yob.
Stamping Delamination Cracking: Lub Hoobkas tsheb tau tshaj tawm delamination cracking hauv txias- dov galvanized ntawv tom qab stamping. Cov laj thawj tseem ceeb suav nrog slag entrapment thiab subcutaneous inclusions. Cov teeb meem no tau dhau los ua cov ntsiab lus pib tawg nyob rau hauv kev ntxhov siab stamping.
Bending thiab Coiling Brittle Fracture: Ib daim ntawv txias -kho cov ntawv tau ntsib kev puas tsuaj thaum lub sij hawm khoov thiab coiling, nrog cov pob txha huv huv thiab tsis muaj cov yas deformation. Kev tshuaj xyuas qhia tau hais tias qhov ua rau muaj ntau ntawm Mg-Si suav nrog thiab kev sib cais hauv kev sib cais, uas cuam tshuam cov nplej txuas ntxiv thiab dhau los ua qhov pib tawg.
3.Yuav ua li cas cov kev sib koom ua ke muaj qhov cuam tshuam loj tshaj plaws ntawm kev pheej hmoo ntawm kev tawg?
Kev sib xyaw ua ke (piv txwv li, Al₂O₃, TiN): Cov kev suav no nyuaj thiab muaj cov yas tsis zoo, ua rau lawv nyuaj rau deform thaum dov. Lawv yooj yim tawg thiab tsim cov saw hlau-zoo li kev faib tawm, ua rau cov matrix ua rau tsis zoo. Cov kev tshawb fawb tau lees paub tias qhov siab Al₂O₃ suav nrog cov ntsiab lus yog qhov ua rau ntawm ntug tawg hauv cov pob zeb.
Kev sib xyaw loj loj (piv txwv li, slag entrapment): Cov no yog cov slags tiv thaiv thaum lub sij hawm nruam casting. Lawv muaj kev sib xyaw ua ke (muaj Ca, Na, K, thiab lwm yam), feem ntau yog qhov loj me thiab tsis sib xws, thiab muaj kev sib raug zoo nrog cov matrix, ua rau muaj kev phom sij loj.
Deformable inclusions (piv txwv li, MnS): Txawm hais tias MnS deforms thiab txuas ntxiv thaum lub sijhawm ua haujlwm kub, yog tias nws loj dhau los yog nws tsim ib lub network, nws yuav ua rau txo qis kev hloov pauv ntawm cov hlau, ua rau cov npoo tawg thaum dov.
Ua ke tsis xws luag ntawm npuas thiab inclusions: Thaum npuas nyob rau saum npoo ntawm steel billet rupture thaum dov, yog hais tias lawv ib txhij txuas rau inclusions, lawv tsim ib tug tev tsis xws luag, uas yog heev yooj yim mus delamination thiab cracking thaum lub sij hawm tom ntej ua.
4.Dab tsi yog qhov kev sib raug zoo ntawm kev pheej hmoo tawg thiab qhov loj thiab kev faib tawm ntawm kev suav nrog?
Qhov Loj Loj: Feem ntau, qhov loj dua qhov kev suav nrog, qhov siab dua qhov kev pheej hmoo ntawm kev tawg. Cov kev suav loj loj yog qhov tsis xws luag hauv macroscopic uas cuam tshuam ncaj qha rau matrix. Cov kev tshawb fawb tau pom tias txawm tias micron - loj (1 ~ 10μm) kheej kheej suav nrog, yog tias nyob hauv thaj chaw muaj kev ntxhov siab (xws li subsurface), tuaj yeem ua rau qaug zog tawg pib.
Distribution Morphology: Kev faib tawm morphology ntawm kev suav nrog yog qhov tseem ceeb dua li lawv tus lej. Ib leeg, cais, me me suav nrog tsis tshua muaj teeb meem. Txawm li cas los xij, yog tias cov khoom sib txuas tau muab faib rau hauv cov saw, cov hlua, los yog pawg, lawv tsim ib qho chaw tsis muaj zog uas ua rau tawg yooj yim, ua rau delamination lossis tawg tawg.
5.Yuav ua li cas txhawm rau txheeb xyuas thiab tiv thaiv cov kab nrib pleb tshwm sim los ntawm kev suav nrog?
Kev Tshawb Fawb:
Online Tsis yog-Kev Ntsuas Kev Ua Phem: Siv lub tshuab kuaj pom qhov tsis zoo ntawm qhov chaw (xws li Parsytec), suav nrog, khawb, thiab lwm yam tsis xws luag ntawm cov kab nrib pleb tuaj yeem kuaj pom hauv qhov tiag - lub sijhawm ntawm kev txuas ntxiv thiab cov kab sib tw, muab cov lus ceeb toom raws sijhawm.
Offline Microscopic Analysis: Rau qhov xav tias muaj kev cuam tshuam, scanning electron microscopy thiab lub zog dispersive spectroscopy yog siv rau kev soj ntsuam microscopic morphology thiab kev tshuaj ntsuam xyuas. Qhov no yog txoj kev txhim khu kev qha tshaj plaws rau kev txiav txim qhov xwm thiab qhov chaw ntawm kev suav nrog.
Kev Tiv Thaiv Kev Tiv Thaiv (Los ntawm Tag Nrho Steelmaking-Rolling Process):
Steelmaking thiab Nruam Casting Control:
Txhim kho qhov tseeb ntawm cov kua theem tswj nyob rau hauv lub crystallizer kom tsis txhob dhau cov kua theem fluctuations uas yuav ua rau lub entrapment ntawm tiv thaiv slag.
Ua kom zoo dua qhov tsis sib xws ntawm cov dej nkag nkag nozzle los txhim kho qhov chaw ntws hauv crystallizer thiab txo cov slag entrapment.
Txhim kho ladle refining los txhawb lub flotation thiab tshem tawm ntawm inclusions.
Bill Quality Control:
Ua qhov chaw thiab sab hauv kev tshuaj xyuas zoo ntawm cov cam khwb cia tsis tu ncua. Billets nrog tsis xws luag yog tiav los yog muab pov tseg.