Mar 14, 2024 Tso lus

Cov txheej txheem ntawm ultra-low carbon ferritic stainless hlau txias dov phaj

GNEE STEEL yog tus kws tshaj lij steel xa khoom.At GNEE, peb tab tom nrhiav rau pem hauv ntej, nqis peev hauv kev tshawb fawb thiab kev txhim kho kom coj cov khoom lag luam tshiab. Peb lub hom phiaj los ua tus thawj coj hauv kev lag luam hauv cov ntsiab lus ntawm cov khoom lag luam zoo, thev naus laus zis, thiab kev pabcuam cov neeg siv khoom, ua kom peb txoj kev loj hlob thiab kev vam meej hauv lub ntiaj teb no.

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Cov txheej txheem ntawm ultra-low carbon ferritic stainless hlau txias dov phaj
Lub ntsiab cuam tshuam rau ntawm qhov kev ntxhib los mos ntawm cov ntawv txias-dov nrog lub cev-centered cubic crystal qauv yog:

(1) Tshuaj muaj pes tsawg leeg. Cov ntsiab lus chromium ntau ntxiv hauv ferritic stainless hlau tuaj yeem tsim cov khoom siv zoo nkauj uas muaj txiaj ntsig zoo rau kev tsim. Thaum lub sij hawm dov txheej txheem ntawm lub phaj, lub stabilizing lub caij Nh yuav ntxiv dag zog rau lub austenite deformation kev ntxhib los mos, yog li ua rau lub y-theem transformation kev ntxhib los mos. ntxiv dag zog;

(2) Cov khoom tov khoom thiab ob-theem hais. Cov kua nplaum C atoms muaj qhov cuam tshuam zoo rau kev sib hloov ntawm cov nplej thaum lub sij hawm ferrite dov. Lub xub ntiag ntawm cov khoom tov alloy ntsiab lus thiab ob-theem hais yuav tsis cuam tshuam rau cov muaj pes tsawg leeg ntawm ferrite dov kev ntxhib los mos, tab sis cov khoom tov alloy Lub xub ntiag ntawm cov ntsiab lus thiab ob-theem hais yuav cuam tshuam rau qib ntawm kev sib hloov ntawm ferrite nplej mus rau qhov chaw ruaj khov. thaum lub sij hawm dov txheej txheem, qhov twg. Qhov sib ntxiv ntawm ri thiab Nl1 pab cov ferrite dov kev ntxhib los mos tig mus rau qhov chaw ruaj khov;

(3) Thermal processing technology. Piv txwv li, thaum ultra-low carbon steel dov nyob rau hauv ferrite cheeb tsam, raws li qhov kawg dov kub txo, lub {111} recrystallization kev ntxhib los mos yuav ho txhim khu kev qha;

(4) Txias dov txo;

(5) Cov txheej txheem Annealing, suav nrog kub, sijhawm, thiab lwm yam.

1. Cov ntaub ntawv sim thiab cov txheej txheem

Cov hlau siv nyob rau hauv qhov kev sim yog ib tug peb-tivthaiv ultra-low carbon Crl8 ferritic stainless hlau smelted thiab dov nyob rau hauv ib tug laboratory nqus induction rauv. Qhov loj ntawm cam khwb cia hlau ingot yog forged thiab lub billet yog 30mm tuab Qhov txo tus nqi yog 88%, lub thickness ntawm cov kub dov phaj yog 3.5 hli, thiab thaum kawg nws yog txias-dov mus rau ib tug 1.0 mm nyias.

Siv lub phaj txias txias thiab ua rau hauv cov qauv cuboid ntawm 1mm tuab x 20mm dav x 28mm ntev, qhov ntev ntawm qhov kev taw qhia yog dov. Siv lub qhov cub ntsev da dej los ua isothermal annealing ntawm cov qauv txias-kub ntawm 850 degree rau ntau zaus ntawm 0 mus rau 15 feeb. Lub degree ntawm kev ua tiav ntawm recrystallization yog txiav txim raws li cov kev hloov nyob rau hauv hardness nkhaus thaum lub sij hawm rov qab recrystallization theem. Cov qauv raug xaiv uas txuas ntxiv kom sov li 3 feeb tom qab ua tiav ntawm recrystallization. , txiav 7 hli nyob rau hauv cov kev taw qhia txuas ntxiv, zom cov ntu mus rau 1500# sandpaper thiab tom qab ntawd polish nws. Thaum kawg, siv FeC1: HC1: H, O etching tus neeg sawv cev nrog qhov sib piv ntawm 1: 10: 20 rau etch, thiab thaij duab nrog lub tshuab ntsuas metallographic. Qhov ntsuas qhov loj me yog ua raws li GB / T6394-2002~ Txoj kev txiav txim siab qhov nruab nrab ntawm cov hlau loj.

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2. Kev sim cov txiaj ntsig thiab kev sib tham

Qhov nruab nrab txoj kab uas hla thiab grain loj theem yog: {{0}}.18Nb; (e) Crl8-3, 0.21Ti Crl8 ferritic stainless hlau txias dov phaj nrog 0.29% Nb ntxiv muaj cov hmoov nplej me tshaj plaws thiab feem ntau zoo sib xws, vim Nb Nws muaj nyob rau hauv daim ntawv ntawm cov tshuaj tov thiab carbonitride nag lossis daus. theem ntawm niobium nrog C thiab N hauv cov hlau. Nb atoms nyob rau hauv cov tshuaj tov yog enriched nyob rau hauv lub grain ciam teb thiab muaj tsawg nyob rau hauv cov nplej, yog li niobium muaj ib tug muaj zog lub peev xwm mus rub grain ciam teb txav yog ntau dua li cov khoom tov titanium. Tsis tas li ntawd, cov niobium carbonitrides NbC, NbN, thiab Nb (CN) uas zoo heev dispersed niobium carbonitrides NbC, NbN, thiab Nb (CN) tuaj yeem pin dislocations thiab tiv thaiv subgrain ciam teb, uas muaj zog cuam tshuam rau kev loj hlob ntawm nplej.

Cr18-3 txawv ntawm ob qho tib si nyob rau hauv uas nws cov fiber ntau kev ntxhib los mos orientation ceev mus txog 12.247. Yog vim li cas tej zaum yuav yog tias cov nyhuv inhibitory ntawm Nb ntawm recrystallization tshwm sim hauv kev tsim tsis txaus. Nyob rau tib lub sijhawm, qhov qub {001} nto kev ntxhib los mos ntawm Cr18-1 yog qhov muaj zog heev thiab ploj mus qeeb thaum lub sij hawm tom qab annealing thiab kub preservation theem, tawm hauv ib qho kev faib ua feem uas ua rau lub formability. {001}<110>orientation kev ntxhib los mos.

Kev sim cov ntaub ntawv ntawm cov khoom siv kho tshuab thiab formability ntawm ultra-low carbon Cr18 stainless hlau annealed txias-dov los xij. Nb ib leeg ruaj khov Cr18-1 annealed txias-kuav los tiag nplooj ntawv muaj lub siab tshaj plaws yield zog thiab tensile lub zog, thaum Ti thiab Nb ob-ruaj khov Cr18-2 yog thib ob. ]riThe ib leeg ruaj khov Crl8-3 muaj qhov siv qis tshaj plaws.

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3. Cov lus xaus

(1) Cov nplej recrystallized tau tom qab annealing ntawm Nb mono-stabilized Crl8 txias-kuav los tiag daim hlau yog me me, thiab cov yield zog thiab tensile zog yog siab, tab sis lub formability yog tsis zoo thiab tus nqi qis, uas tsis tuaj yeem ua tau raws li qhov yuav tsum tau muaj. cov ntaub ntawv sib sib zog nqus.

(2) Txawm hais tias cov recrystallized grain loj ntawm ri mono-stabilized Crl8 txias-kuav los tiag ntawv yog qhov loj tshaj plaws thiab lub zog tsis siab, nws cov yas yog qhov zoo tshaj plaws, thiab {111} dav hlau kev ntxhib los mos orientation ntom ntom uas muaj txiaj ntsig zoo rau kev tsim khoom. yog siab dua. Tus nqi r tuaj yeem ncav cuag 1.55, uas ua tau raws li qhov yuav tsum tau muaj ntawm cov ntaub ntawv sib sib zog nqus.

(3) Lub recrystallized grain loj ntawm Ti thiab Nb dual-stabilized Crl8 cov ntawv txias-kuav los tiag yog nruab nrab, thiab nws cov nqi nce mus txog 1.48, uas ua tau raws li qhov yuav tsum tau ua rau cov ntaub ntawv sib sib zog nqus.

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