Kev tshawb fawb txog kev kho cua sov ntawm Titanium Alloy Phaj

Titanium, raws li cov khoom siv corrosion-resistant, yog dav siv nyob rau hauv aerospace, petrochemical, ntsev ntau lawm, luam ntawv thiab dyeing, tshuaj, khoom noj khoom haus, seawater desalination, thiab lwm yam. Txawm li cas los, nyob rau hauv kub thiab siab concentration ntawm chloride, crevice corrosion tshwm sim nyob rau hauv ntshiab. titanium, uas cuam tshuam rau lub neej kev pab cuam. Yuav kom daws tau qhov teeb meem ntawm crevice corrosion ntawm ntshiab titanium nyob rau hauv kub thiab siab concentration ntawm chloride, cov neeg tsim ib tug tshiab hom ntawm titanium alloy --- Ti-0.2Pd alloy. Cov hlau muaj peev xwm tiv taus cov cheeb tsam hauv cheeb tsam hauv kev txo cov xov xwm thiab cov kub concentrated chlorides, tab sis vim yog qhov sib ntxiv ntawm cov hlau zoo nkauj palladium, tus nqi yog siab, yog li nws daim ntawv thov raug txwv. nyob rau nruab nrab -1970s, Tebchaws Asmeskas Titanium Metals Corporation tsim Ti-0.3Mo-0.8Ni alloy. Cov alloy yog ze li ntawm hom titanium alloy, muaj qhov zoo corrosion kuj nyob rau hauv qhov kub thiab txias, siab concentration ntawm chloride, tuaj yeem hloov cov nqi siab dua ntawm Ti-0.2Pd alloy [3-4], tau suav nrog nyob rau hauv lub tebchaws United States, lub tebchaws United Kingdom, Russia, Nyiv, Fabkis, Lub teb chaws Yelemees, thiab lwm yam. Tus qauv, thiab muab tso rau hauv industrialized ntau lawm.
Nyob rau xyoo 1980s, Tuam Tshoj pib Ti-0.3Mo-0.8Ni alloy cov ntaub ntawv ua thiab siv cov kev tshawb fawb, tab sis kuj suav nrog peb cov qauv (xws li Tuam Tshoj TA10), thiab nyob rau hauv ntshiab titanium tej zaum yuav tshwm crevice corrosion ib puag ncig tau siv. Piv txwv li, nyob rau lub Peb Hlis 1985, nws tau siv rau lub tshuab cua sov ntawm lub tshuab nqus tsev ntsev hauv Xiangli Salt Mine, thiab thaum lub Plaub Hlis 1986, nws tau siv rau chav cua sov ntawm magnesium chloride evaporation tank hauv Tanggu Salt Farm. Nanjing Baotai Cov Khoom Siv Tshwj Xeeb Lub Tuam Txhab tau ua tiav qhov kev txiav txim ntawm titanium thiab steel cov ntaub ntawv sib xyaw rau potash chiv project tsim tawm txawv teb chaws. Cov khoom sib xyaw cladding yog 3 hli tuab TA10 titanium alloy ntawv. Raws li GB/T3621-2007 "titanium thiab titanium alloy phaj" tus qauv, cov pa phaj yuav tsum ua kom tau raws li qhov yuav tsum tau muaj ntawm chav kawm A, qhov elongation ntawm kev tawg tuaj yeem ncav cuag 18%, thaum lub phaj tom qab siv rau kev tawg vuam xav tau Ua tau raws li qhov yuav tsum tau muaj ntawm chav kawm B, qhov elongation ntawm so yuav tsum ncav cuag ntau dua 25%. Rau cov txheej txheem tawg tawg ntawm titanium alloy phaj plasticity yuav tsum, tuaj yeem siv los ua cov khoom siv raw ntawm cov khoom siv qis hardness 0 titanium sponge phaj, txhawm rau ua tiav cov txheej txheem tom ntej ntawm plasticity index yuav tsum tau, tab sis qhov no yuav inevitably nce tus nqi ntawm cov ntaub ntawv raw. . Qhov kev sim no siv qib 2 titanium daim txhuam cev ua cov khoom siv raw los npaj TA10 titanium alloy daim ntawv, los ntawm kev kawm txog kev kho cua sov sib txawv ntawm lub koom haum thiab cov khoom ntawm TA10 titanium alloy daim ntawv, txhawm rau tshawb xyuas cov kev kho cua sov kom tsim nyog, nrog rau kev pom kom tau txais plasticity Performance index kom ua tau raws li qhov yuav tsum tau ua ntawm cov txheej txheem tawg tawg tom ntej TA10 titanium alloy daim ntawv.

1 Kev sim

1.1 Cov ntaub ntawv sim siv 2 daim txhuam cev titanium, npib tsib xee - molybdenum intermediate alloy, tom qab ob lub tshuab nqus nws tus kheej siv melting los npaj ib txoj kab uas hla ntawm 560mm TA10 titanium alloy ingot, nws cov tshuaj muaj pes tsawg leeg yog qhia hauv Table 1. ingot los ntawm forging billet, milling, sib tsoo thiab lwm yam txheej txheem ua los ntawm kub dov slabs, thiab tom qab ntawd hauv 1680 dov zeb los ntawm ob-hluav taws dov rau hauv 3.0mm tuab phaj. Daim duab 1 rau lub xeev dov TA10 titanium alloy phaj metallographic duab, lub koom haum ntawm nws zoo heev strip rolling xeev deformation lub koom haum. Table 2 qhia txog chav tsev kub txhua yam khoom ntawm dov lub xeev TA10 titanium alloy daim ntawv.

1.2 Kev kho cua sov kev kho cua sov kev sim siv SX2-2.5-10 qhov hluav taws xob tsis kam, qhov kub thiab txias yuam kev ± 5 degree C. TA10 titanium alloy yog ze li ntawm hom alloy, qhov cua txias tsis zoo ntawm nws lub koom haum thiab cov khoom, qhov ntsuas kub ntawm qhov annealing feem ntau yuav tsum tau xaiv hauv qab ntawm + / theem hloov chaw ntawm 120-200 degree C. Qhov kub ntawm + / theem hloov pauv ntawm + / theem hloov taw tes. Yog li ntawd, cov qauv kev kho cua sov tau txiav rau ntawm 3.0mm tuab kub dov TA10 titanium alloy daim hlau thiab annealed ntawm qhov sib txawv ntawm qhov kub thiab txias, qhov kub ntawm qhov annealing yog 550, 600, 650, 700, 750 thiab 800 degree, lub sij hawm tuav yog 30min, thiab cov txheej txheem txias. yog cua txias. Cov qauv raug muab coj los ntawm cov phaj annealed rau kev soj ntsuam microstructure thiab cov cuab yeej siv tshuab los tshawb xyuas qhov tsim nyog annealing kub. Nyob rau hauv lub annealing kub, annealing kev kho mob nrog sib txawv tuav lub sij hawm, lub sij hawm tuav yog 15, 30, 60, 120, 180min feem, coj mus kuaj los soj ntsuam lub microstructure ntawm lub phaj tom qab annealing rau sib txawv lub sij hawm thiab ntsuam xyuas lub mechanical zog, thiab thaum kawg tau txais. kev kho cua sov kom tsim nyog.

2 Cov txiaj ntsig thiab kev sib tham

2.1 Cov txiaj ntsig ntawm kev kho cua sov ntawm lub koom haum thiab cov khoom siv kho tshuab ntawm phaj TA10 titanium alloy kub dov ntawv los ntawm qhov sib txawv ntawm qhov kub thiab txias 30min thiab cua txias annealing kev kho mob ntawm chav tsev kub txhua yam khoom thiab microstructure yog qhia nyob rau hauv Table 3 thiab daim duab 2. raws li pom nyob rau hauv Table 3, TA10 titanium alloy phaj los ntawm 550 degree × 30min / AC annealing kev kho mob, tshwm sim los ntawm qhov tshwm sim ntawm kev ua hardening ntawm lub zog ntawm lub siab zog thiab plasticity ntawm phenomenon ntawm cov neeg pluag tsis raug tshem tawm. Kev tshem tawm; nruab nrab ntawm 550 ~ 650 degree, nrog rau qhov nce hauv kev kho cua sov, lub phaj txheej txheem hardening tshwm sim maj mam tshem tawm, lub zog tensile maj mam txo, plasticity me ntsis txhim kho; nruab nrab ntawm 650 ~ 700 degree, lub zog ntawm cov ntawv kub dov yog yuav luag tsis hloov, thaum lub plasticity yog ho txhim kho; Nyob nruab nrab ntawm 750 ~ 800 degree, lub zog tensile ntawm cov ntawv kub dov tseem tsis hloov, thaum lub elongation tom qab tawg yog txo, phaj Plasticity deterioration. Raws li tuaj yeem pom los ntawm daim duab 2, TA10 titanium alloy phaj ntawm 700 degree hauv qab cov txheej txheem tseem ceeb, lub koom haum ntawm dov deformation ntawm lub strip zoo li lub koom haum, thaum kho cua sov kub nce mus rau 700 degree, recrystallization nucleation thiab grain loj hlob tshwm sim. . Kev kho cua sov kub ntawm 750 degree, recrystallization yog qhov pib ua tiav, feem coob ntawm cov koom haum rau cov theem isometric finer, tab sis tseem muaj cov koom haum me me ntawm banded deformation. Thaum qhov kev kho cua sov kub txog 800 degree, qee cov nplej loj tuaj txawv txav, thiab lub koom haum yog ntxhib. Yog li ntawd, txhawm rau txhawm rau TA10 titanium alloy kub dov ntawv kom ua tau raws li qhov yuav tsum tau ua ntawm cov txheej txheem tawg tawg ntawm cov yas ntawm lub phaj, qhov kev kho cua sov tsim nyog yuav tsum raug xaiv ntawm 700 ~ 750 degree.

2.2 Cov txiaj ntsig ntawm kev tuav lub sijhawm ntawm lub koom haum thiab cov khoom siv kho tshuab ntawm lub phaj raws li kev kho cua sov ntawm qhov kev sim xaiv qhov kev kho cua sov ntawm 750 degree, cov khoom siv ntawm lub phaj tom qab kev kho cua sov ntawm qhov sib txawv tuav lub sij hawm ntawm qhov kub thiab txias yog qhia hauv Table 4, microstructure yog qhia nyob rau hauv daim duab 3. los ntawm Table 4 tuaj yeem pom, thaum lub cua sov kub ntawm 750 degree, nrog rau lub sij hawm ntev tuav, lub zog tensile ntawm TA10 titanium alloy phaj tsis txawv ntau, nyob rau hauv 5 ~ 10MPa, Lub sijhawm tuav ntawm 5 ~ 10MPa, lub zog tensile ntawm TA10 titanium alloy phaj tsis loj heev. ~ 10MPa, rwb thaiv tsev lub sij hawm nyob rau hauv lub ncua sij hawm ntawm 15 ~ 60min, phaj elongation ntawm so nrog lub extension ntawm rwb thaiv tsev lub sij hawm ho loj, plasticity yuav zoo dua; thiab thaum lub sij hawm rwb thaiv tsev ntawm ntau tshaj 60min, lub phaj elongation ntawm so muaj ib tug ntau pom tseeb txo, plasticity maj deteriorate. Raws li tau pom los ntawm daim duab 3, TA10 titanium alloy phaj ntawm 750 degree tom qab 15, 30, 60, 120, 180min annealing kev kho mob, lub koom haum los ntawm thawj zaug strip rolling deformation koom haum maj recrystallization nucleation thiab grain loj hlob, thaum tuav lub sij hawm ntawm 30min. , lub recrystallization yog qhov pib ua tiav (saib daim duab 3b), thaum lub sij hawm tuav mus txog 60min, recrystallization ntawm tag nrho, lub koom haum yog zoo thiab uniform isotropic, thiab cov yas yog zoo; Thaum lub sij hawm tuav ntau tshaj 60min, lub phaj muaj qhov pom tseeb txo qis hauv elongation tom qab tawg, plasticity maj mam deteriorate. Lub koom haum zoo thiab zoo ib yam theem isometric (saib daim duab 3c). Raws li lub sij hawm rwb thaiv tsev txuas ntxiv mus ntxiv, cov qauv deformation thiab lwm yam cuam tshuam kev loj hlob ntawm cov qoob loo tshem tawm, qee qhov tshwj xeeb lis ciam teb sai sai [11], qee cov nplej recrystallized loj hlob txawv txav, lub koom haum maj mam ntxhib.

Nyob rau hauv cov ntsiab lus, TA10 titanium alloy dov daim ntawv annealing kev kho mob yuav tsum tau mus cuag ib tug tej yam kub thiab txias nyob rau hauv thiaj li yuav zoo teb kom tau ib tug zoo lub koom haum thiab kev ua tau zoo. Xws li hauv 750 degree annealing kev kho mob tuaj yeem tau txais thaum lub koom haum equiaxial thiab zoo plasticity, thaum qhov kub thiab txias txuas ntxiv thaum lub zog nce, qhov elongation txo. TA10 titanium alloy phaj annealing kev kho yuav tsum tau tswj thaum lub sij hawm tuav, txwv tsis pub vim kev loj hlob ntawm recrystallized nplej, yuav cuam tshuam cov plasticity ntawm cov khoom.

3 Kev xaus

(1) Thaum tshav kub kub kho kub txog 600 degree, lub koom haum ntawm TA10 titanium alloy phaj tuaj yeem tau txais cov lus teb zoo, tab sis cov yas tsis zoo. Yog tias koj xav tau kom tau txais cov yas zoo dua kom tau raws li qhov yuav tsum tau ua ntawm kev siv cov titanium daim hlau rau cov khoom tawg, koj yuav tsum tau ua kom kub siab dua (700 ~ 750 degree) ntawm kev kho cua sov. (2) Thaum qhov kev kho cua sov yog qhov tseeb, lub sijhawm tuav tsis tshua muaj txiaj ntsig ntawm lub zog ntawm TA10 titanium alloy phaj, tab sis cov yas muaj qhov cuam tshuam loj. (3) Rau 3 hli tuab TA10 titanium alloy kub dov ntawv, tom qab (700 ~ 750) degree × (30 ~ 60) min / AC annealing kev kho mob, koj tuaj yeem tau txais ib qho kev sib txuam ntau dua equiaxial-theem thiab zoo dua kev siv tshuab, kom tau raws li cov siv cov titanium daim hlau rau cov khoom tawg yooj yim.