Titanium alloy vuam
Nws yog ib theem hlau alloy tsim los ntawm β-theem khoom tov. Tsis muaj kev kho cua sov, nws muaj zog dua. Tom qab quenching thiab aging, cov alloy yog advanced.Ib kauj ruam ntxiv dag zog, chav tsev kub lub zog yuav ncav cuag 1372 ~ 1666 MPa; Tab sis cov thermal stability tsis zoo, yuav tsum tsis txhob siv rau qhov kub thiab txias.
Nws yog biphasic alloy, muaj cov khoom zoo, cov qauv zoo ruaj khov, zoo toughness, plasticity thiab kub deformation zog, tuaj yeem ua tau zoo dua rau kev kub siab, tuaj yeem quenched, aging kom ntxiv dag zog rau cov hlau. Lub zog tom qab kev kho cua sov yog li 50% ~ 100% siab dua li tom qab annealing; Lub zog kub kub, tuaj yeem ua haujlwm hauv 400 ℃ ~ 500 ℃ kub rau lub sijhawm ntev, nws cov thermal stability yog qis dua rau α titanium alloy.
Ntawm peb titanium alloys, feem ntau siv yog α titanium alloy thiab α + β titanium alloy; Qhov kev ua tau zoo ntawm α titanium alloy yog qhov zoo tshaj plaws, ua raws li α + β titanium alloy, thiab β titanium alloy yog qhov phem tshaj. α titanium alloy code rau TA, β titanium alloy code rau TB, α + β titanium alloy code rau TC.
Titanium alloy tuaj yeem muab faib ua cov khoom siv hluav taws xob kub, siab zog alloy, corrosion resistant alloy (titanium - molybdenum, titanium - palladium alloy, thiab lwm yam), tsis tshua muaj kub alloy thiab tshwj xeeb muaj nuj nqi alloy (titanium - hlau hydrogen cia khoom thiab titanium - nickel nco. alloy). Cov muaj pes tsawg leeg thiab cov khoom ntawm cov alloys raug pom nyob rau hauv lub rooj.
Cov txheej txheem sib txawv thiab microstructure ntawm cov cua sov kho titanium alloys tuaj yeem tau los ntawm kev kho cov txheej txheem kho cua sov. Nws feem ntau ntseeg tias cov qauv zoo equiaxed muaj cov yas zoo dua, thermal stability thiab qaug zog. Cov qauv spiculate muaj siab durability, creep zog thiab tawg toughness. Equiaxial thiab rab koob zoo li cov ntaub so ntswg sib xyaw muaj cov khoom zoo dua. Titanium yog ib yam tshiab ntawm cov hlau, kev ua tau zoo ntawm titanium muaj feem xyuam rau cov ntsiab lus ntawm carbon, nitrogen, hydrogen, oxygen thiab lwm yam impurities, lub purest titanium iodide impurity ntsiab lus tsis ntau tshaj 0.1%, tab sis nws lub zog yog tsawg, siab plasticity. .
Cov khoom ntawm 99.5% kev lag luam ntshiab titanium yog raws li nram no: ceev ρ = 4.5g / cubic cm, melting point 1725 ℃, thermal conductivity λ = 15.24W / (mK), tensile zog σb = 539MPa, elongation δ = 25%, seem shrinkage ψ = 25%, elastic modulus E = 1.078 × 105MPa, hardness HB195. Qhov ceev ntawm titanium alloy feem ntau yog kwv yees li 4.51g / cubic centimeter, tsuas yog 60% ntawm cov hlau, lub zog ntawm cov titanium ntshiab yog ze rau lub zog ntawm cov hlau zoo tib yam, qee qhov siab zog titanium alloy tshaj lub zog ntawm ntau cov hlau alloy steel. Yog li ntawd, lub zog tshwj xeeb (lub zog / ntom) ntawm titanium alloy yog ntau dua li ntawm lwm cov khoom siv hlau, raws li qhia hauv Table 7-1. Nws tuaj yeem tsim cov khoom thiab qhov chaw nrog lub zog siab, zoo rigidity thiab lub teeb yuag. Tam sim no, titanium alloys yog siv nyob rau hauv lub cav Cheebtsam, pob txha, tawv nqaij, fasteners thiab tsaws iav.