GR5 (Ti-6Al-4V) yog "301 stainless hlau" ntawm titanium alloys-nws tau dav siv thiab muaj ntau yam kev thov. Los ntawm lub foob pob hluav taws mus rau tib neeg cov pob txha cog, GR5 yog ubiquitous. Dab tsi yog qhov txawv ntawm nws thiab ntshiab titanium?
GR5 Composition Design
GR5 Composition: Titanium-raws li txhuas 5.5-6.5%, Vanadium 3.5-4.5%. Aluminium yog ib qho -stabilizing khoom- txhim kho lub zog thiab kub tsis kam. Vanadium yog ib qho -stabilizing element- tso cai rau cov hlau kom tswj tau qhov + dual - theem qauv ntawm chav tsev kub. Cov theem ua kom siab - qhov kub thiab txias, thaum lub sij hawm ua kom lub zog ntawm chav tsev kub. Cov qauv dual-theem no yog qhov tseem ceeb rau kev ua haujlwm sib npaug ntawm GR5.
GR1 / GR2 yog ib qho -theem alloys- tsis tshua muaj zog (GR2 tensile zog 345MPa) tab sis zoo plasticity, feem ntau yog siv rau hauv cov khoom siv tshuaj thiab phaj kub exchangers. GR5 muaj lub zog tensile ntawm 950MPa, 2.7 npaug ntawm GR2, tab sis nws elongation tsuas yog ib nrab ntawm GR2.
Kev siv Aerospace
Rocket Roj Tanks: SpaceX Falcon 9 roj tso tsheb hlau luam siv 2219 aluminium alloy, tab sis qhov thib ob -theem cav plhaub siv GR5-lub zog ntawm aluminium alloys poob ntau dhau ntawm qhov kub thiab txias. GR5 yields rau 500MPa ntawm 400 degree, ob zaug ntawm 2219.
Satellite txhawb nqa thiab fasteners: GR5 muaj qhov ceev ntawm 4.43 g / cm³, uas yog 56% ntawm cov hlau. Txhua kilogram ntawm qhov hnyav txo hauv lub satellite txuag tau $ 10,000 hauv cov nqi xa tawm -GR5 hloov steel fasteners yog qhov kev xaiv pheej yig rau kev txo qhov hnyav. Hloov 17-4PH bolts nrog GR5 nyob rau hauv seem cryogenic ntawm lub cav ua rau 44% qhov hnyav.
Kev Kho Mob Implants
GR5 yog ib qho khoom siv rau kev cog hniav orthopedic- cov pob qij txha, pob qij txha, pob txha daim hlau, thiab kev cog hniav. Peb yog vim li cas: zoo biocompatibility (TiO2 zaj duab xis spontaneously cov ntaub ntawv nyob rau hauv titanium nto, tsis yog - lom thiab tsis yog - tsis lees txais); ib qho elastic modulus ntawm 110 GPa, 55% ntawm cobalt-chromium alloys- ze rau pob txha 20-30 GPa, txo cov kev ntxhov siab tiv thaiv; thiab lub zog ntawm 950 MPa, ua tau raws li cov kev xav tau ntawm kev thauj khoom.
Txawm li cas los xij, GR5's elastic modulus tseem siab dua cov pob txha -ntev - implantation yuav ua rau pob txha resorption. Tam sim no, ntxeem tau GR5 (3D luam nrog 50-70% porosity) tuaj yeem txo cov elastic modulus mus rau 15-30 GPa, ze rau cov pob txha pob txha.
Machining Challenges ntawm GR5
High Cutting Temperature ntawm Titanium Alloy - Titanium lub thermal conductivity tsuas yog 1/4 ntawm cov hlau, tsom rau kev txiav cov cua sov ntawm qhov txiav thiab ua rau cov cuab yeej hnav sai. Tig GR5 nrog cov cuab yeej carbide yuav tsum muaj qhov nrawm nrawm ntawm 40 m / min, uas yog 1/3 qhov ceev uas yuav tsum tau ua rau machining 304 stainless hlau. Cov tshuaj chlorine- yuav tsum muaj cov khoom ua kom txias - cov emulsions zoo tib yam tsis muaj txiaj ntsig.