Metallographic qauv thiab txhua yam khoom ntawm GR5 titanium slab

Nrog rau kev kho dua tshiab ntawm cov khoom siv hauv tsev aerospace, qhov kev thov rau Ti6Al4V titanium alloy titanium daim hlau yog nce, uas kuj tso siab dua thiab siab dua cov kev xav tau ntawm nws cov khoom siv ntau yam thiab kev tsim. Kev ua tau zoo, loj-loj titanium slabs yog tus yuam sij kom ua tiav kev npaj loj-loj titanium daim hlau ntawm Ti6Al4V titanium alloy. Cov kws tshawb fawb feem ntau kawm txog qhov sib txawv ntawm microstructural nyob rau hauv qhov sib txawv deformation zones ntawm dav slabs, aiming los txhim kho kev npaj kom loj hlob thiab loj ntau lawm stability ntawm Ti6Al4V titanium alloy nplua-grained slabs, thiab npaj rau tom ntej dov ntawm high-zoo nplua-grained dav slabs. . Dav titanium daim hlau nteg lub hauv paus ntawm lub koom haum.

Ti6Al4V titanium alloy (qib tsev GR5) muaj nruab nrab ntawm chav tsev kub thiab kub lub zog, zoo creep kuj thiab thermal stability, siab qaug zog kev kawm thiab tsis kam mus tawg kev loj hlob (nyob rau hauv seawater), raws li zoo raws li zoo tawg toughness thiab thermal stability. Ntsev kev nyuaj siab corrosion kuj, haum rau molding siv ntau txoj kev ua haujlwm siab, thiab siv ntau yam kev siv vuam thiab kev siv tshuab. Raws li cov khoom siv dav dav, Ti6Al4V titanium alloy tau dav siv hauv kev lag luam aerospace thiab kev lag luam pej xeem. Industrially tsim loj-loj ingots ntawm Ti6Al4V titanium alloy raug xaiv rau qhov kev xeem. Smelted 3 zaug nyob rau hauv lub tshuab nqus tsev consumable arc rauv. Tom qab tev tawm, cov qauv raug coj los ntawm sab sauv, nruab nrab thiab qis ntawm cov ingot los kuaj cov tshuaj muaj pes tsawg leeg. Qhov nruab nrab tus nqi ntawm cov ntaub ntawv ntsuas ntawm peb cov qauv yog (qhov loj feem, %): Al6.42, V4.09, Fe0.02, O0.20, Ti tshuav. Nws tuaj yeem pom tias cov ntsiab lus tseem ceeb Al thiab V thiab cov ntsiab lus tsis huv Fe thiab O hauv Ti6Al4V titanium alloy industrial-qib loj-loj ingot muaj cov ntsiab lus zoo sib xws thiab tsis muaj kev sib cais, ua tau raws li cov kev xav tau ntawm cov hlau alloy siab. High-zoo, loj-hom boards.
Cov hlau ingot yog forged rau hauv ib lub slab siv ntau qhov hluav taws kub ntxhov siab dawb forging txheej txheem. Cov cuab yeej forging yog 45MN ceev forging tshuab. Qhov luaj li cas ntawm cov slab tiav tom qab forging yog 150mm × 1060mm × 1500mm. Txiav lub phaj raws li tus ntoo khaub lig seem txog 100 hli ntawm ntug ntawm lub phaj, soj ntsuam lub sab qis-magnification qauv ntawm phaj, thiab muab qib raws li GJB2505A-2008 tus qauv. Siv cov qauv metallographic thiab cov qauv tensile los ntawm ntau txoj haujlwm ntawm titanium slab raws li xav tau. Cov qauv metallographic raug tshuaj xyuas thiab muab qhab nia raws li GJB1538A-2008 tus qauv. Qhov txiav tensile specimen blanks tau kho cua sov. Cov txheej txheem kho cua sov yog 810 degree / 1.5h / AC. Cov qauv kho cua sov ua raws li GB/T228-2008 tus qauv.

(1) Chav tsev kub tensile zog ntawm qhov sib txawv ntawm cov titanium slab ua tau raws li qhov yuav tsum tau ua index thiab kuj nplua nuj. Lub zog tensile yog ntau tshaj 100MPa siab tshaj li tus qauv yuav tsum tau, lub zog tawm los yog ntau tshaj 87MPa siab tshaj tus qauv tus nqi, thiab lub elongation thiab cheeb tsam shrinkage kuj muaj ib tug tej yam margin. Cov ntaub ntawv ntsuas ntawm lub zog Performance index muaj qhov tsawg tshaj plaws dispersion thiab qhov sib txawv ntawm elongation Performance index yog me me, qhia tau hais tias cov txheej txheem forging ua tiav kev tswj zoo ntawm cov uniformity ntawm slab forming.
(2) Lub transverse low-magnification qauv ntawm titanium slab yog fuzzy siv lead ua, qhia tau hais tias lub forging muaj zoo forging permeability, cov nplej tau tawg tag, thiab cov degree ntawm cov qauv refinement yog siab.
(3) Lub transverse microstructure ntawm titanium slab yog feem ntau equiaxed qauv, thiab qhov nruab nrab qhov loj ntawm lub hauv paus ntawm lub slab yog me ntsis loj dua li ntawm lwm qhov chaw. Yog vim li cas rau qhov sib txawv ntawm cov qauv yog tias qhov deformation ntawm cov tub ntxhais ntawm cov slab yog qis dua li ntawm lwm qhov chaw, thiab cov degree ntawm grain fragmentation kuj tsawg. Lub longitudinal microstructure ntawm titanium slab yog dominated los ntawm ntev strips ntawm thawj. Cov hlau streamlines raws lub deformation thiab elongation cov lus qhia yog pom tseeb, cov nplej zoo thiab zoo ib yam, thiab cov qauv sib xws ntawm txhua qhov qauv yog qhov zoo.