Kev kho cua sov yam ntxwv ntawm titanium alloys
(1) Kev hloov pauv Martensite yuav tsis hloov pauv cov khoom ntawm titanium alloys. Qhov no feature yog txawv los ntawm lub martensitic theem transformation ntawm hlau. Kev kho cua sov ua kom muaj zog ntawm titanium alloys tsuas yog tso siab rau cov laus decomposition ntawm metastable theem (xws li cov theem martensitic) tsim los ntawm quenching. Ntxiv mus, txoj kev kho cua sov rau cov ntshiab A-type titanium alloys yeej tsis yooj yim sua. Siv tau, uas yog, kev kho cua sov ntawm titanium alloys yog siv rau + hom titanium alloys.
(2) Kev kho cua sov yuav tsum zam qhov tsim ntawm ω theem. Kev tsim ntawm theem ω yuav ua rau cov titanium alloy nkig, thiab kev xaiv kom raug ntawm cov txheej txheem kev laus (piv txwv li, siv qhov kub thiab txias dua) tuaj yeem ua rau theem ω decompose.
(3) Nws yog ib qho nyuaj rau refine titanium alloy nplej los ntawm kev siv rov ua theem hloov. Qhov no kuj txawv ntawm cov ntaub ntawv steel. Feem ntau cov hlau tuaj yeem siv rov ua cov theem hloov pauv ntawm austenite thiab pearlite (lossis ferrite, cementite) los tswj cov nucleation thiab kev loj hlob ntawm cov theem tshiab kom ua tiav cov nplej refinement. Tsis muaj qhov tshwm sim zoo li no hauv titanium alloys.
(4) Tsis zoo thermal conductivity. Cov thermal conductivity tsis zoo tuaj yeem ua rau tsis muaj zog ntawm titanium alloys, tshwj xeeb tshaj yog + titanium alloys, loj quenching thermal stress, thiab cov khoom yuav ua rau warping thaum quenching. Vim tias tsis zoo thermal conductivity, titanium alloys tuaj yeem yooj yim ua rau lub zos kub ntau dhau thaum deformed, ua rau nws muaj peev xwm ua rau lub zos kub siab tshaj qhov hloov pauv thiab tsim cov qauv Widmanstatten.
(5) Chemically active. Thaum lub sij hawm kho cua sov, titanium alloys yooj yim hnov mob nrog oxygen thiab dej vapor, tsim cov txheej txheem oxygen nplua nuj lossis oxide nplai nrog qhov tob ntawm qhov chaw ua haujlwm, uas txo cov kev ua haujlwm ntawm cov hlau. Nyob rau tib lub sijhawm, titanium alloys yooj yim nqus hydrogen thaum kho cua sov, ua rau hydrogen embrittlement.
(6) Muaj qhov sib txawv loj hauv cov ntsiab lus hloov pauv. Txawm hais tias cov khoom xyaw yog tib yam, vim yog sib txawv smelting heats, lawv transformation
Kub qee zaum txawv heev.
(7) Thaum tshav kub hauv cheeb tsam theem, cov nplej zoo li loj tuaj. Lub coarsening ntawm cov nplej tuaj yeem ua rau cov plasticity ntawm cov hlau poob qis, yog li cov cua kub thiab lub sijhawm yuav tsum tau tswj nruj me ntsis, thiab kev kho cua sov hauv cheeb tsam theem yuav tsum tau siv ceev faj.
Kev kho cua sov hom ntawm titanium alloys
Cov theem hloov ntawm titanium alloy yog lub hauv paus ntawm kev kho cua sov ntawm titanium alloy. Txhawm rau txhim kho kev ua haujlwm ntawm titanium alloy, ntxiv rau kev tsim nyog alloying, nws yuav tsum tau ua ke nrog kev kho cua sov kom tsim nyog. Muaj ntau txoj kev kho cua sov rau titanium alloys. Cov khoom siv feem ntau suav nrog kev kho annealing, kev kho kev laus, kev kho cua sov deformation thiab tshuaj kho cua sov.
1 Kev kho mob Annealing
Annealing yog tsim rau ntau yam titanium alloys, thiab thaum kawg txhim kho cov yas ntawm cov hlau, tshem tawm nws cov kev ntxhov siab thiab stabilizes cov qauv. Annealing cov ntaub ntawv muaj xws li kev ntxhov siab annealing, recrystallization annealing, ob chav annealing, isothermal annealing thiab nqus annealing.
(1) Kev ntxhov siab ntxhov siab annealing. Txhawm rau tshem tawm cov kev ntxhov siab sab hauv tsim thaum lub sij hawm casting, txias deformation thiab vuam txheej txheem, kev ntxhov siab nyem annealing tuaj yeem siv. Qhov kub ntawm qhov kev ntxhov siab annealing yuav tsum qis dua qhov kub ntawm recrystallization, feem ntau 450 ~ 650 degree. Lub sij hawm yuav tsum tau nyob ntawm qhov loj me ntawm qhov chaw ua haujlwm, cov keeb kwm kev ua haujlwm thiab qib kev ntxhov siab yuav tsum tau ua.
(2) Ordinary annealing. Lub hom phiaj yog txhawm rau tshem tawm cov kev ntxhov siab hauv titanium alloy semi-tiav khoom thiab muaj lub zog siab thiab plasticity uas ua tau raws li cov kev cai. Qhov kub annealing feem ntau sib npaug los yog qis dua li qhov kub ntawm recrystallization pib. Cov txheej txheem annealing no feem ntau yog siv thaum cov khoom siv hlau tawm hauv lub hoobkas, yog li nws tuaj yeem hu ua Hoobkas annealing.
(3) Ua kom tiav annealing. Lub hom phiaj yog kom tshem tawm tag nrho kev ua haujlwm hardening, stabilize tus qauv thiab txhim kho plasticity. Cov txheej txheem no feem ntau tshwm sim recrystallization, yog li nws tseem hu ua recrystallization annealing. Lub annealing kub yog qhov zoo dua ntawm qhov ntsuas kub ntawm recrystallization thiab theem transformation kub. Yog tias qhov kub hloov pauv theem dhau mus, Widmanstatten qauv yuav raug tsim thiab cov khoom ntawm cov hlau yuav deteriorated. Hom, kub, thiab txias txoj kev ntawm annealing sib txawv ntawm ntau hom titanium alloys.
(4) Ob chav annealing. Txhawm rau txhim kho cov pob txha toughness, plasticity thiab ruaj khov qauv ntawm cov hlau, yuav tsum muaj ob qho kev sib txuas. Cov qauv hlau tom qab annealing yog ntau yam sib xws thiab ze rau qhov sib npaug. Txhawm rau kom muaj kev ruaj ntseg ntawm cov qauv thiab cov khoom ntawm cov cua sov-resistant titanium alloys nyob rau hauv qhov kub thiab txias thiab kev ntxhov siab ntev, hom annealing no feem ntau siv. Muab ob npaug rau annealing muaj cua sov thiab cua txias lub alloy ob zaug. Cov cua kub ntawm thawj qhov kub thiab txias annealing yog siab dua los yog ze rau qhov kawg kub ntawm recrystallization, kom recrystallization tuaj yeem ua tiav tag nrho yam tsis ua rau cov nplej loj tuaj, thiab qhov ntim feem ntawm ap theem tuaj yeem tswj tau. Tom qab cua txias, cov qauv tsis ruaj khov txaus, yog li yuav tsum muaj qhov kub qis thib ob annealing. Lub annealing kub yog qis dua qhov kub ntawm recrystallization thiab khaws cia rau lub sij hawm ntev kom tag nrho decompose lub metastable theem tau los ntawm high-temperature annealing.
(5) Isothermal annealing. Isothermal annealing muab qhov zoo tshaj plaws plasticity thiab thermal stability. Qhov no hom ntawm annealing yog tsim rau dual-theem titanium alloys nrog ntau dua -stabilizing cov ntsiab lus. Isothermal annealing txais ib txoj kev ua kom txias txias, uas yog, tom qab cua sov mus rau qhov kub siab tshaj qhov ntsuas kub ntawm recrystallization thiab tswj cov cua sov, nws tam sim ntawd hloov mus rau lwm lub qhov cub kub (feem ntau 600 ~ 650 degree) rau kev txuag hluav taws xob, thiab tom qab ntawd cua txias rau. chav kub.
2 Kev kho mob quenching
Quenching aging yog txoj hauv kev tseem ceeb ntawm kev kho cua sov thiab ntxiv dag zog ntawm titanium alloys. Nws siv cov theem hloov los ua kom muaj zog ntxiv, yog li nws tseem hu ua ntxiv dag zog rau kev kho cua sov. Kev siv zog ntawm titanium alloy kev kho cua sov yog nyob ntawm qhov xwm txheej, concentration thiab kev kho cua sov tshwj xeeb ntawm cov hlau alloy, vim tias cov xwm txheej no cuam tshuam rau hom, muaj pes tsawg leeg, kom muaj nuj nqis thiab kev faib tawm ntawm theem metastable tau los ntawm quenching cov hlau, nrog rau qhov xwm txheej. ntawm lub precipitated theem thaum lub decomposition ntawm metastable theem. Structure, degree ntawm dispersion, thiab lwm yam., uas muaj feem xyuam rau cov muaj pes tsawg leeg ntawm cov alloy, kev kho cua sov txheej txheem specifications thiab thawj qauv.
Rau alloys nrog ib tug tej yam muaj pes tsawg leeg, cov nyhuv ntawm lub hnub nyoog ntxiv dag zog nyob rau hauv lub xaiv cov txheej txheem kev kho cua sov. Qhov siab dua qhov quenching kub, qhov pom tseeb qhov kev laus zog ntxiv zog. Txawm li cas los xij, quenching saum toj no qhov kev hloov pauv kub yuav ua rau brittleness vim yog coarse ntau dhau. Rau ob-theem titanium alloys nrog qis concentration, siab dua kub quenching yuav siv tau kom tau ntau martensite, thaum rau ob-theem titanium alloys nrog ntau dua concentration, qis kub quenching yuav siv tau kom tau ntau metastable theem. , thiaj li tau txais lub sij hawm siab tshaj plaws-zoo ntxiv zog. Txoj kev ua kom txias yog feem ntau dej txias lossis roj txias, thiab cov txheej txheem quenching yuav tsum ceev ceev kom tiv thaiv cov theem ntawm decomposing thaum lub sij hawm hloov cov txheej txheem thiab txo cov laus zog ntxiv zog. Kev xaiv ntawm kev laus kub thiab lub sijhawm yuav tsum tau ua raws li qhov ua tau zoo tshaj plaws. Feem ntau, kev laus kub ntawm + titanium alloy yog 500 ~ 600 degree thiab lub sijhawm laus yog 4 ~ 12h; Thaum lub hnub nyoog kub ntawm -type titanium alloy yog 450 ~ 550 degree. , lub sij hawm 8 ~ 24h, txias txoj kev yog cua txias.
