Qib 2 yog cov khoom lag luam ntshiab titanium, thiab nws cov creep kuj tsis tshua muaj piv nrog cov titanium alloys, tab sis nws tseem qhia tau tias tus cwj pwm zoo thiab siv tau ntawm qhov kub siab.
Creep yog hais txog cov yas deformation qeeb ntawm cov khoom nyob rau hauv qhov kev ntxhov siab tas li ntawm qhov kub thiab txias dhau sijhawm. Rau Qib 2 titanium, creep dhau los ua ib qho kev txiav txim siab thaum qhov kev pabcuam kub siab tshaj li ntawm 150℃(300℃F), thiab nws cov kev cuam tshuam ua rau qhov kub thiab txias nce ntxiv.
Ntawm qhov kub thiab txias qis dua 315℃(600℃F), Qib 2 tswj kev nkag siab me ntsis. Nws yog dav siv nyob rau hauv tsawg-stress thiab non-structural high-temperature daim ntaub ntawv xws li tshav kub exchangers, piping systems, thiab cov khoom nyob rau hauv cov khoom siv. Txawm li cas los xij, nyob rau hauv kev ntxhov siab thiab kub kub, cov ntshiab titanium deforms yooj yim dua li cov qib alloyed xws li Ti‑6Al-4V lossis lwm yam titanium alloys.
Tus cwj pwm creep ntawm Qib 2 muaj kev cuam tshuam loj heev los ntawm:
Kub:Kev kub siab dua ua rau txo qis zog thiab nrawm deformation.
Qib Stress:Kev siv ntau dua kev ntxhov siab ua rau lub neej nkag mus thiab ua rau muaj kev nkag siab ntau ntxiv.
Microstructure:Cov qoob loo loj ua lub luag haujlwm; Qhov ntau thiab tsawg ntawm cov nplej feem ntau txo qis tsis kam, thaum coarser microstructures tuaj yeem txhim kho nws.
Lub sij hawm nphav raug:Kev kub siab ntev ntev yuav txhawb nqa kev deformation thiab kev ntxhov siab.
Txij li thaum Qib 2 tsis muaj kev ntxiv dag zog rau alloying ntsiab xws li txhuas, vanadium, los yog tin, nws tsis muaj qhov kub-kub stability thiab creep kuj muab los ntawm nag lossis daus hardening los yog solid-solution ntxiv dag zog rau hauv titanium alloys. Yog li no, Qib 2 tsis pom zoo rau cov khoom siv hnyav hnyav uas muaj cov khoom hnyav ntawm qhov kub siab tshaj 300-350℃rau lub sijhawm ntev.
Hauv cov ntsiab lus:
Hauv qab 150 degree: Kev ruaj ntseg zoo heev; creep yog negligible.
150-315 degree: Tus cwj pwm qis qis; siv tau rau cov ntawv thov kev ntxhov siab qis-rau- nruab nrab.
Saum toj 315 degree: Creep kuj poob qis; tsis haum rau kev siv cov txheej txheem siab.
Rau qhov yuav tsum tau muaj qhov kub thiab txias siab, titanium alloys lossis lwm yam khoom siv tiv taus cua sov feem ntau pom zoo siv 2 qib kev lag luam ntshiab titanium.
