Qhov cuam tshuam ntawm kev laus kub ntawm Ti-6AL-7Nb titanium alloy forged rods
Ti-6AL-7Nb titanium alloy yog dav siv nyob rau hauv aerospace, kev kho mob thiab tshuaj industries vim nws zoo heev mechanical zog, corrosion kuj thiab biocompatibility. Kev laus yog txheej txheem tseem ceeb los txhim kho lub zog thiab hardness ntawm Ti-6AL-7Nb alloy. Kev laus kub muaj qhov cuam tshuam zoo rau microstructure thiab txhua yam khoom ntawm cov hlau. Txoj kev tshawb no tau kawm txog cov txiaj ntsig ntawm kev laus ntawm qhov kub thiab txias ntawm microstructure thiab cov khoom ntawm Ti-6AL-7Nb titanium alloy forged rods.
kev sim
Cov qog laus laus: Tom qab kub kub kho kev laus ntawm Ti-6AL-7Nb titanium alloy, cov theem precipitated hauv cov nplej yuav hloov, uas yuav ua rau kev loj hlob ntawm cov nplej thiab nce qhov sib txawv ntawm qhov ceev. Cov kev hloov no ua rau cov qog laus zuj zus, uas ua rau cov khoom muaj zog thiab muaj zog.
Kev loj hlob ntawm cov qoob loo: Kev kub ntxhov siab tuaj yeem ua rau kev loj hlob ntawm cov nplej, uas yuav muaj kev cuam tshuam rau cov khoom siv kho tshuab. Cov nplej loj tuaj yeem ua rau txo qis ntawm cov khoom siv kho tshuab, tab sis qee zaum kuj tuaj yeem ua rau cov khoom siv zog.
Theem transformation: Qee lub sij hawm precipitated hauv Ti-6AL-7Nb titanium alloy tej zaum yuav raug hloov mus rau theem thaum kub kub. Qhov kev hloov pauv no yuav ua rau muaj kev hloov pauv hauv cov qauv siv lead ua lattice, yog li cuam tshuam rau cov khoom siv.
Kev tiv thaiv corrosion: Kev tiv thaiv corrosion ntawm Ti-6AL-7Nb titanium alloy tej zaum yuav cuam tshuam los ntawm kev laus kub. Qee qhov kev kho mob laus tuaj yeem ua rau kev faib tawm ntawm qee cov ntsiab lus hauv cov hlau hloov pauv ntawm cov ciam teb, yog li cuam tshuam rau nws txoj kev tiv thaiv corrosion.
Thermal stability: Lub thermal stability ntawm Ti-6AL-7Nb titanium alloy kuj tseem yuav cuam tshuam los ntawm kev laus kub. Kev kho kev laus kom zoo tuaj yeem txhim kho kev ruaj ntseg ntawm cov hlau nyob rau hauv qhov kub thiab txias.
Ti-6AL-7Nb alloy rods yog forged ntawm qhov kub ntawm 950 degree nrog tus nqi txo ntawm 60%. Lub forged tuav tau muab faib ua peb pawg thiab raug rau qhov sib txawv ntawm kev laus ntawm 500 degree, 550 degree thiab 600 degree rau 2 teev raws li. Lub microstructure thiab mechanical zog ntawm cov qauv yog tus yam ntxwv ntawm optical microscopy, X-ray diffraction thiab tensile xeem.
Cov txiaj ntsig thiab kev sib tham
Cov txiaj ntsig tau pom tias cov qauv ntawm Ti-6AL-7Nb alloy tom qab forging muaj equiaxed theem thiab flaky + theem. Tom qab kev laus, cov theem hais coarsen thiab lub flaky + theem hloov mus rau theem equiaxed. Qhov siab dua qhov kev laus kub, qhov pom tseeb dua qhov coarsening ntawm -phase hais thiab hloov pauv ntawm flaky + theem. Tsis tas li ntawd, XRD tsom xam qhia tau hais tias nrog kev nce ntawm kev laus kub, qhov kev siv ntawm (002) ncov txo qis thiab qhov kev siv ntawm (200) ncov nce, qhia tau hais tias nrog kev nce ntawm kev laus kub, cov ntsiab lus ntawm theem txo thiab cov ntsiab lus ntawm theem nce nrog kub.
Tensile tests qhia tau hais tias thaum lub hnub nyoog kub nce, qhov kawg tensile zog (UTS) thiab yield zog (YS) ntawm cov qauv nce, thaum lub ductility txo. UTS thiab YS ntawm 600 degree hnub nyoog piv txwv tau mus txog qhov siab tshaj plaws ntawm 1370 MPa thiab 1260 MPa feem, uas yog 36% thiab 25% siab dua cov qauv ntawm 500 degree hnub nyoog. Txawm li cas los xij, raws li qhov kub thiab txias nce, qhov elongation txo los ntawm 12.5% mus rau 4.3%, qhia tias plasticity ntawm cov hlau txo qis nrog kev laus kub.
nyob rau hauv xaus
Hauv cov ntsiab lus, qhov kub thiab txias muaj qhov cuam tshuam loj rau cov qauv thiab cov khoom ntawm Ti-6AL-7Nb titanium alloy forged rods. Qhov nce hauv kev laus kub ua rau cov coarsening ntawm -phase hais, transformation ntawm lamellar + theem, txo -phase cov ntsiab lus, thiab nce nyob rau hauv -phase cov ntsiab lus. Tsis tas li ntawd, raws li kev laus kub nce, UTS thiab YS ntawm cov qauv nce, thaum lub elongation txo. Cov txiaj ntsig kev tshawb fawb muab cov lus qhia muaj txiaj ntsig rau kev ua kom zoo ntawm cov txheej txheem kev laus ntawm Ti-6AL-7Nb titanium alloy.
