Dab tsi yog Cov Khoom Siv Hluav Taws Xob Ntawm Gr23 Kev Kho Mob Titanium Alloy?

Titanium alloys yog dav siv nyob rau hauv aerospace sector vim lawv lub zog tshwj xeeb, lub teeb yuag, kub ua hauj lwm thiab zoo heev corrosion kuj. Tam sim no, titanium alloys siv nyob rau hauv aerospace sector account rau txog 70% ntawm tag nrho cov titanium ntau lawm. High purity titanium muaj cov yas zoo heev, tab sis cov ntsiab lus impurity ntau tshaj li ib qho nyiaj yuav tsim cov khoom sib txuas, cov yas ntawm titanium alloys poob sharply. Lub microstructure ntawm titanium alloy yog qhov tseem ceeb hauv kev txiav txim siab nws lub zog tensile, qaug zog thiab tawg toughness. Nws txoj kev npaj yog tsim los ntawm cov theem thiab theem, thiab nws txoj kev npaj tuaj yeem muab faib ua Weiss, mesh pob tawb, bimodal thiab isometric kev npaj.

(1) tensile muaj nuj nqi: feem ntau nyob rau hauv cov thawj grain ciam teb tawg nyob rau hauv lub ntxhib theem, thiab no ntxhib thawj grain feem ntau muaj nyob rau hauv lub Weil txoj kev npaj, thiab tawg nyob rau hauv cov kev taw qhia ntawm roughly parallel Weil cov tuav. Feem ntau, chav tsev kub plasticity ntawm WEA tsis zoo vim nws cov nplej ntxhib. Cov txheej txheem bimodal feem ntau muaj cov theem pib zoo thiab kev hloov pauv, yog tias qhov kev npaj bimodal tau txais los ntawm "kev daws teeb meem + kev laus" kev kho mob, nws chav tsev kub tensile lub zog yog me ntsis muaj zog dua li lwm yam peb txheej txheem.

(2) Cracking toughness thiab crack extension rate : Feem ntau hais lus, lub cracking toughness ntawm Weiss kev npaj yog ntau dua li ntawm equiaxial-kev npaj thiab bimodal kev npaj. Lub cracking toughness ntawm lub alloy yog heev cuam tshuam los ntawm tus naj npawb thiab qhov loj ntawm incipient -theem, thiab lub cracking toughness nce nrog qhov txo ntawm incipient -phase.

(3) Kev qaug zog ua haujlwm: Ntawm cov saum toj no plaub hom kev sib txawv, qhov kev qaug zog ntawm isometric kev npaj yog qhov loj heev, thiab kev qaug zog ntawm Weiss kev npaj tsis zoo heev. Qhov thib ob, tsis muaj teeb meem qis lossis siab qaug zog, rau tib lub alloy, kev qaug zog ntawm kev ua haujlwm bimodal yog qhov zoo heev, thaum qaug zog kev ua haujlwm ntawm Weil txoj kev npaj yog qhov tsis zoo.

(4) Thermal stability thiab creep kuj: lub thiaj li hu ua tshav kub-resistant titanium alloy yog ib tug alloy nrog zoo heev thermal stability. Txawm li cas los xij, vim tias qhov kub tsis kam ntawm -phase tsis zoo, yog li nyob rau hauv cov cua sov uas muaj zog titanium alloys feem ntau tsuas muaj me me ntawm -phase -alloys thiab + -alloys. Creep kuj yog feem ntau cuam tshuam los ntawm kev teeb tsa zoo. Ntawm plaub daim ntawv kev npaj, qhov kev npaj isometric muaj kev ua haujlwm tsis zoo vim yog cov nplej zoo thiab ntau qhov sib cuam tshuam; Lub koom haum Weiss muaj kev nkag siab siab, tab sis nws lub koom haum grain loj yog ntxhib heev, thiab -phase ntawm cov ciam teb yog ntxhib thiab yooj yim kis los ntawm oxygen, thiab kuj tseem muaj qee qhov tsis muaj zog. Yog li ntawd, daim ntawv thov ntawm titanium alloys ntawm qhov kub thiab txias feem ntau xaiv ob lub xeev kev npaj thiab kev npaj pob tawb, nrog zoo induction, thawj-theem yog tsawg.