Titanium alloy muaj qhov tshwj xeeb me me (txog 4.5), lub siab melting point (kwv yees li 1600 degree), zoo plasticity, siab tshwj xeeb lub zog, muaj zog corrosion kuj, thiab tuaj yeem ua haujlwm ntawm qhov kub thiab txias ntev (tam sim no, thermal zog titanium alloy. tau siv ntawm 500 degree). Yog li ntawd, nws tau siv ntau zuj zus los ua ib qho tseem ceeb ntawm cov dav hlau thiab dav hlau cav. Ntxiv nrog rau titanium alloy forgings, muaj cov castings, daim hlau (xws li aircraft tawv), fasteners, thiab lwm yam. Qhov hnyav piv ntawm titanium alloy siv nyob rau hauv niaj hnub txawv teb chaws aircraft tau mus txog 30 feem pua, uas qhia tau hais tias titanium alloy muaj ib tug dav zeem muag nyob rau hauv lub aviation kev lag luam. Tau kawg, titanium alloys kuj muaj qhov tsis zoo hauv qab no: xws li loj deformation kuj, tsis zoo thermal conductivity, loj rhiab heev (kwv yees 1.5), thiab tseem ceeb cuam tshuam ntawm microstructure hloov ntawm txhua yam khoom, uas ua rau complexity ntawm smelting, forging, thiab tshav kub. kev kho mob.
Yog li ntawd, nws yog ib qho tseem ceeb heev uas yuav tsum tau txais kev ntsuam xyuas tsis zoo los xyuas kom meej lub metallurgical thiab kev ua tau zoo ntawm titanium alloy cov khoom. Cov hauv qab no feem ntau qhia txog qhov tsis xws luag uas yooj yim tshwm sim hauv qhov tsis txaus ntseeg ntawm titanium forgings xws lititanium blocksthiab titanium rings:
1. Kev cais tsis raug
Tsuas yog Segregation Spot, titanium-nplua nuj segregation, thiab strip Ntxiv rau kev cais tawm, qhov txaus ntshai tshaj plaws yog interstitial type Stable segregation (hom I Segregation), uas feem ntau nrog cov qhov me me thiab cov kab nrib pleb, muaj cov pa oxygen, nitrogen, thiab lwm yam gases, thiab yog nkig. Thiab aluminium-nplua nuj hom ruaj khov segregation (hom II Segregation), uas kuj nrog cov kab nrib pleb thiab brittleness thiab ua rau muaj kev phom sij txaus ntshai.
2. Kev suav nrog
Feem ntau ntawm lawv yog cov hlau suav nrog cov ntsiab lus melting siab thiab siab ceev. Lub siab melting point thiab high-density ntsiab nyob rau hauv lub titanium alloy muaj pes tsawg leeg yog tsis tag melted thiab tshuav nyob rau hauv lub matrix rau daim ntawv (xws li molybdenum inclusion), thiab kuj muaj carbide cuab tam chips tov nyob rau hauv lub smelting raw cov ntaub ntawv (tshwj xeeb tshaj yog cov ntaub ntawv siv dua tshiab) los yog cov txheej txheem vuam tsis raug (cov smelting ntawm titanium alloy feem ntau siv lub tshuab nqus tsev electrode remelting txoj kev), xws li tungsten arc vuam, tawm hauv high-density inclusions, xws li tungsten inclusion, ntxiv rau titanium inclusion, thiab lwm yam.
Lub hav zoov ntawm kev suav nrog tuaj yeem yooj yim ua rau muaj qhov tshwm sim thiab kev nthuav tawm ntawm cov kab nrib pleb, yog li lawv tsis raug tso cai tsis xws luag (piv txwv li, raws li Soviet Union cov ntaub ntawv xyoo 1977, kev sib xyaw ua ke ntawm high-density nrog ib txoj kab uas hla ntawm 0.3~ 0.5 hli pom nyob rau hauv X-ray tshuaj xyuas ntawm titanium alloy yuav tsum tau sau tseg).
3. Residual shrinkage kab noj hniav
Saib piv txwv.
4. Qhov
Qhov tsis tas yuav muaj nyob ib leeg, tab sis kuj tseem tuaj yeem muaj nyob rau hauv ntau qhov ntom ntom, uas yuav ua rau kom lub voj voog qis qis qis qis kev loj hlob thiab ua rau qaug zog thaum ntxov.
5. Ncua tseg
Feem ntau yog hais txog forging tawg. Vim lub siab viscosity, tsis zoo fluidity, thiab tsis zoo thermal conductivity ntawm titanium alloy, nws yog ib qho yooj yim los tsim shear bands (strain kab) nyob rau hauv lub forging vim lub loj nto kev sib txhuam, pom tseeb internal deformation non-uniformity thiab loj sab hauv thiab sab nraud kub. qhov sib txawv thaum lub sij hawm forging deformation txheej txheem, uas yuav ua rau tawg nyob rau hauv mob hnyav, thiab nws txoj kev taw qhia yog feem ntau raws li cov kev taw qhia ntawm qhov siab tshaj plaws deformation kev nyuaj siab.
6. Tshaj dhau
Lub thermal conductivity ntawm titanium alloy tsis zoo. Ntxiv rau qhov overheating ntawm forgings los yog raw cov ntaub ntawv los ntawm cov cua kub tsis zoo thaum lub sij hawm ua kub, nws kuj yog ib qho yooj yim mus ua overheating vim thermal nyhuv thaum lub sij hawm deformation thaum lub sij hawm forging txheej txheem, uas ua rau cov kev hloov ntawm microstructure thiab tsim ntawm overheated Widmanstein qauv. .
Titanium alloy muaj qhov loj deformation tsis kam, thiab cov thermal conductivity tsis zoo thiab kev hloov ntawm microstructure muaj kev cuam tshuam loj rau cov khoom siv kho tshuab, uas ua rau muaj qhov nyuaj hauv kev smelting, forging, thiab kev kho cua sov.
