Yog vim li cas vim li cas qhov elongation tus nqi ntawm ntshiab npib tsib xee phaj nce mus txog 51.5%

Ntshiab npib tsib xee (ntau hom Ni200, Ni201, N4, N6) belongs rau lub ntsej muag -centered cubic (FCC) siv lead ua qauv hlau, uas yog lub hauv paus ntsiab lus rau nws elongation siab. Cov qauv FCC muaj 12 lub tshuab plam, uas yog ntau tshaj li 12 lub hauv paus ntawm lub cev -centered cubic (BCC) (tab sis nyuaj rau qhib) lossis 3 txog 6 lub hauv paus ntawm lub hexagonal kaw -packed (HCP). Ntau lub tshuab plam txhais tau hais tias qhov kev sib cais feem ntau yuav pib thiab txav mus rau hauv cov khoom siv lead ua, thiab cov khoom siv tuaj yeem ua rau cov yas deformation tsis zoo thaum muaj kev ntxhov siab thiab tsis tuaj yeem tawg.

High purity yog lwm qhov tseem ceeb. Cov ntsiab lus npib tsib xee ntawm kev lag luam ntshiab npib tsib xee feem ntau yog ntau dua lossis sib npaug li 99.0% ~ 99.6%, cov impurities (xws li carbon, sulfur, thiab phosphorus) tsis tshua muaj qis, thiab yuav luag tsis muaj cov theem thib ob los yog cov tshuaj atoms los cuam tshuam kev txav mus los. Cov yam ntxwv tsis zoo ntawm cov khoom siv hluav taws xob tsawg ntxiv txhawb kev cuam tshuam ntawm tus ntoo khaub lig-slip thiab annealing ntxaib tsim. Cov txheej txheem no txhim kho lub zog muaj peev xwm hardening thaum lub sij hawm deformation txheej txheem thiab zam lub caj dab hauv zos, yog li ua tiav cov qauv siab elongation.

Nyob rau hauv sib piv, stainless hlau los yog ib co alloys yuav muaj qis elongation vim complex theem qauv los yog precipitated theem. Qhov txiaj ntsig zoo ntawm cov nickel ntshiab no ua rau nws xaiv cov khoom siv rau cov xwm txheej uas xav tau kev kos duab sib sib zog nqus, khoov, thiab ncab.

Qhov laj thawj ncaj qha tshaj plaws rau qhov siab elongation ntawm cov ntshiab npib tsib xee daim hlau yog kev kho mob (mos xeev / M xeev). Yog hais tias qhov txias - dov los yog kub- dov ntshiab npib tsib xee phaj tsis annealed, nws yuav khaws ib tug siab ceev ntawm dislocations thiab nyob rau hauv ib tug nyuaj lub xeev (Y xeev), thiab elongation yuav tsuas yog 10% mus rau 20%. Tom qab ua tiav annealing, cov khoom siv recrystallizes los ua ib qho equiaxed nplua -grained qauv, ua hauj lwm hardening yog tshem tawm, thiab cov plasticity yog ho rov qab.

Cov txheej txheem annealing yam tsis muaj:

Kub: 600-800℃(hauv lub tshuab nqus tsev lossis chaw tiv thaiv kom tsis txhob oxidation).

Lub sij hawm cua sov: 1 ~ 4 teev, kho raws li phaj thickness.

Txoj kev ua kom txias: lub qhov cub txias lossis txias txias.

Tom qab annealing, lub zog tensile ntawm ntshiab npib tsib xee daim hlau feem ntau poob mus rau 350-450 MPa, thiab lub zog tawm los yog 80-150 MPa, tab sis qhov elongation tuaj yeem ruaj khov ntawm ntau dua 45-55%, thiab 51.5% yog qhov ntsuas tus nqi ntau hauv qhov ntau. Kev tshawb fawb qhia tau hais tias annealing ntawm ib ncig ntawm 650℃tuaj yeem sib npaug ntawm qib ntawm recrystallization, ua kom cov yas thiab tswj cov qoob loo los ntawm kev loj hlob ntau dhau.

Cov txheej txheem Advanced xws li cryogenic dov ua ke nrog qis - kub luv - lub sij hawm annealing (xws li 623K luv- sij hawm annealing) tuaj yeem ua kom zoo dua elongation thaum tuav lub zog siab. Los ntawm kev tswj cov rolling strain thiab annealing tsis, lub zog -plasticity synergy tuaj yeem ua tiav (xws li ib qho elongation ntawm 11.7% thaum lub zog tawm los yog 607MPa), muab cov kev daws teeb meem rau siab -kawg daim ntawv thov.

Tshuaj muaj pes tsawg leeg tswj

Tsawg- carbon ntshiab npib tsib xee (carbon Tsawg dua lossis sib npaug li 0.02%), xws li Ni201, tsis yooj yim rau graphitization thiab embrittlement ntawm qhov kub thiab txias thiab tswj tau zoo siab - kub plasticity. Ordinary Ni200 tej zaum yuav txo tau qhov kev ua tau zoo vim cov pa roj carbon nag lossis daus saum 315 degree, thaum lub elongation ntawm qis -carbon ntau yam ruaj khov dua.

Grain loj thiab microstructure

Nruab nrab equiaxed nplej (feem ntau 10-50 μm tom qab annealing) yog qhov zoo tshaj plaws rau plasticity. Yog tias cov nplej zoo dhau lawm, lub zog yuav nce ntxiv vim yog Hall-Petch nyhuv, tab sis qhov kev ncua ntev yuav raug txo; yog tias cov nplej tuab dhau lawm, lub zog tag nrho yuav raug txo. Qhov tshwm sim ntawm annealing ntxaib ntxiv txhim khu lub plasticity cia.

Ua Keeb Kwm thiab Kev Xeem Xeem

Kub- dov + annealed daim hlau yuav muaj cov yas zoo dua li cov txias txias - dov + annealed daim hlau. Thaum lub sij hawm ntsuas tensile, ntsuas qhov ntev, tus nqi lim, thiab qhov kub thiab txias kuj tseem yuav cuam tshuam rau cov ntaub ntawv . 51.5% yog qhov ua tau zoo raws li tus qauv hauv chav tsev kub.

4. Kev xav txog tus nqi hauv kev lag luam

Lub siab elongation ntawm ntshiab npib tsib xee phaj ncaj qha mus rau hauv zoo heev formability. Hauv kev tsim cov khoom siv tshuaj, cov ntawv ntshiab nickel feem ntau yog siv rau hauv cov alkali muaj zog -resistant (xws li caustic soda) ntim, kav dej, thiab li qub, uas yuav tsum tau muaj ntau yam dabtsi yog khoov, stamping, thiab sib sau. High plasticity kom tsis txhob tawg.

Hauv kev lag luam hluav taws xob, cov nickel ntshiab yog siv rau hauv cov roj teeb, cov khoom sib txuas thiab cov khoom siv hluav taws xob tiv thaiv hluav taws xob, thiab nws cov ductility zoo txhawb kev txiav txim siab tob tob. Nyob rau hauv lub teb ntawm lub zog tshiab thiab aviation, ntshiab npib tsib xee lub siab hluav taws xob thiab thermal conductivity ua ke nrog plasticity yog haum rau siab - kub sealing thiab structural qhov chaw.

Piv nrog rau cov hlau tsis muaj steel, cov nickel ntshiab muaj qhov zoo dua corrosion kuj nyob rau hauv ib puag ncig corrosive (xws li alkaline media); piv nrog tooj liab alloys, nws siab - kub stability yog zoo dua. Cov khoom no ua rau cov hlau nickel ntshiab irreplaceable nyob rau hauv siab - kawg manufacturing.

5. Cov ntaub ntawv xaiv thiab ua cov lus qhia

Thaum xaiv cov npib tsib xee ntshiab, koj yuav tsum qhia meej lub xeev: lub xeev mos (M) yog tsim rau txoj kev nyuaj, thiab lub xeev nyuaj (Y) yog haum rau siab - lub zog yuav tsum tau. Thaum yuav khoom, xa mus rau GB / T 2054, ASTM B162, thiab lwm yam qauv, thiab xyuam xim rau qhov ntsuas qhov ntev.

Kev ceev faj txog kev ua:

Tsis txhob ua haujlwm txias nruab nrab thiab ua haujlwm nruab nrab ntawm lub sijhawm.

Tom qab welding, ua kev ntxhov siab nyem annealing los kho cov yas.

Rau qhov loj - daim hlau loj, tswj cov cua sov sib xws kom tiv thaiv kev loj hlob ntawm cov nplej tsis zoo los ntawm cov cua sov hauv zos.

Nyob rau hauv lub neej yav tom ntej, nrog rau kev nce qib ntawm thermomechanical ua technology (xws li gradient qauv tsim, nanotwin tswj), ntshiab npib tsib xee yuav tsum ua kom tiav lub zog siab dua thaum tswj siab elongation, thiab nthuav ntau daim ntawv thov ciam teb.

Xaus

Lub elongation tus nqi ntawm cov ntshiab npib tsib xee phaj nce mus txog 51.5%, uas yog qhov tseem ceeb ntawm kev sib koom ua ke ntawm FCC lub siab symmetry qauv, siab purity yam ntxwv thiab scientific annealing txheej txheem. Qhov no tsis tsuas yog qhia txog cov hauv paus ntsiab lus ntawm cov ntaub ntawv kev tshawb fawb tab sis kuj muab kev ruaj ntseg plasticity lav rau kev tsim khoom lag luam. Cov lag luam tuaj yeem txhim kho cov khoom lag luam thiab kev ua haujlwm zoo los ntawm kev nkag siab tob txog cov txheej txheem no hauv kev xaiv cov khoom siv thiab cov txheej txheem tsim.