Yam Tseem Ceeb rau Kev Xaiv Gr1 vs. Gr2 Titanium

1. Mechanical Property Requirements

Ductility thiab Formability:

XaivQib 1yog hais tias daim ntawv thov yuav tsum tau muaj ductility siab, sib sib zog nqus nqus, complex dabtsi yog khoov, los yog hnyav forming (xws li, nyias- cov hlab ntsa, cov khoom precision). Nrog qis impurity cov ntsiab lus (tshwj xeeb tshaj yog cov pa oxygen tsawg dua lossis sib npaug ntawm 0.18% thiab hlau tsawg dua lossis sib npaug li 0.2%), Qib 1 muaj qhov zoo tshaj plaws elongation (Ntau dua lossis sib npaug rau 24%) thiab txo qhov chaw (Ntau dua lossis sib npaug li 30%), ua rau nws tsis tshua muaj kev tawg thaum ua haujlwm txias.

XaivQib 2rau cov ntawv thov xav tau qhov sib npaug ntawm lub zog thiab ductility. Nws cov qib impurity siab me ntsis (oxygen Tsawg dua lossis sib npaug ntawm 0.25%, hlau tsawg dua lossis sib npaug li 0.3%) txhim kho cov khoom muaj zog (275-485 MPa) thiab tensile lub zog (345-550 MPa) piv rau Qib 1 (YS: 170-280 MPa; TS: 240-3) ductility (240-300) thaum tswj tau zoo tshaj los yog sib npaug li 20%) rau kev sib sau (piv txwv li, nplooj ntawv, daim hlau, welded qauv).

Toughness thiab Fatigue Resistance:

Qib 1 yog nyiam rau cov ntawv thov cryogenic (-253℃rau ambient) lossis dynamic load scenarios (xws li, cov hlab ntsha siab, aerospace Cheebtsam) vim nws qhov qis impurity-induced embrittlement txaus ntshai thiab ntau dua toughness.

Qib 2 yog tsim rau cov khoom siv hluav taws xob zoo li qub lossis nruab nrab dynamic loads (piv txwv li, kev lag luam kav dej, marine hardware) qhov twg txhim kho lub zog ntau dua qhov txo qis hauv qhov toughness.

2. Corrosion Ib puag ncig

Me me rau nruab nrab Corrosion Conditions:

Ob qib muaj qhov ua tau zoo heev rau kev xeb hauv huab cua, dej tshiab, organic acids, thiab feem ntau cov tshuaj lom neeg. Qib 2 cov ntsiab lus hlau siab dua me ntsis muaj kev cuam tshuam tsawg heev hauv qhov chaw ib puag ncig.

Hnyav Corrosion Ib puag ncig:

Xaiv Qib 1 rau cov ntawv thov uas muaj cov tshuaj chloride-nplua nuj media (piv txwv li, dej hiav txwv, brines) los yog crevice corrosion- cov xwm txheej tshwm sim (piv txwv li, cov kav dej kub sib txawv). Nws qis impurity (Fe, O, C) cov ntsiab lus txo qhov kev pheej hmoo ntawm microgalvanic corrosion thiab precipitate -induced crevice nres.

Qib 2 yog txais tau rau cov tshuaj chloride tsawg dua (piv txwv li, cov qauv ntawm ntug hiav txwv nrog kev saib xyuas tsis tu ncua) tab sis yuav xav tau kev tiv thaiv corrosion ntxiv (xws li, passivation) rau lub sijhawm ntev - kev ntseeg tau.

High -Tub kub oxidation:

Ob qib ua tau zoo txog 400 degree. Rau qhov kub thiab txias ntawm 400-500 degree, Qib 2 cov ntsiab lus qis dua cov pa oxygen zoo dua me ntsis oxidation tsis kam, tab sis tsis pom zoo rau kev siv siab tshaj 500℃(xav txog cov qib alloyed titanium zoo li Qib 5 rau kev pabcuam kub).

3. Kev ua thiab Fabrication xav tau

Kev ua haujlwm txias thiab ua kom yooj yim:

Qib 1 yooj yim dua rau kev ua haujlwm txias (xws li, dov, kos duab, stamping) vim nws qhov qis qis zog thiab ductility ntau dua, txo cov cuab yeej hnav thiab ua cov nqi rau cov khoom sib txawv.

Weldability:

Ob qib yog nkag tau yooj yim weldable siv cov txheej txheem (TIG, MIG, plasma vuam). Txawm li cas los xij:

Qib 1 ua kom huv welds uas tsis tshua muaj kev pheej hmoo ntawm impurity-induced cracking, ua rau nws zoo tagnrho rau cov welds tseem ceeb (xws li, kho mob implants, siab -siab tshuab).

Qib 2 cov ntsiab lus hlau siab dua me ntsis txhim kho qhov sib txuas ntawm cov pas dej ua ke tab sis yuav tsum muaj kev tswj hwm nruj dua ntawm cov khoom siv vuam kom tsis txhob muaj cov theem sib txuas.

Machineability:

Tsis yog qib yog machinable heev (titanium qhov qis thermal conductivity ua rau cov cuab yeej hnav), tab sis Qib 1 qhov qis hardness (HB Tsawg dua lossis sib npaug rau 110) ua rau nws yooj yim dua rau tshuab dua Qib 2 (HB Tsawg dua lossis sib npaug rau 135).

4. Kev Pabcuam Kub Kub

Cryogenic rau Ambient Kub (-253℃txog 200 degree):

Qib 1 yog qhov kev xaiv zoo tshaj plaws, vim nws cov ntsiab lus tsis muaj impurity tiv thaiv kev hloov pauv ntawm qhov kub thiab txias thiab tswj cov ductility.

Ambient rau Nruab Nrab Kub Kub (200℃txog 400 degree):

Qib 2 yog qhov zoo dua rau nws txoj kev nkag siab ntau dua thiab kev tuav lub zog, tsim nyog rau cov ntawv thov xws li cov tshuab hluav taws xob, cov tshuab tso pa tawm, lossis cov khoom siv thermal ua haujlwm.

5. Nqi thiab Muaj

Qib 2yog qib CP Ti uas tau siv ntau tshaj plaws, muab cov nqi zoo dua -kev ua tau zoo vim nws qhov siab tsis huv siab dua (txo cov nqi ua kom zoo dua) thiab muaj ntau dua nyob rau hauv cov qauv qauv (cov ntawv, phaj, tuav, raj).

Qib 1feem ntau yog 10-20% kim dua Qib 2 vim yog kev tswj hwm tsis huv thaum lub sijhawm tsim khoom. Nws yog pom zoo tsuas yog thaum nws superior ductility, toughness, los yog corrosion kuj tseem ceeb heev rau daim ntawv thov kev ua tau zoo.

6. Cov qauv kev lag luam thiab cov kev cai yuav tsum tau ua

Xyuas kom ua raws li daim ntawv thov- cov qauv tshwj xeeb (xws li ASTM B265 rau daim ntawv / phaj, ASTM B338 rau seamless raj, AMS 4900/4901 rau kev siv aerospace). Ob qib ua tau raws li cov qauv kev lag luam feem ntau, tab sis Qib 1 yuav xav tau rau cov khoom siv kho mob (ISO 5832-2) lossis cov khoom siv cryogenic (ASME Section VIII) vim nws qhov ua tau zoo ib yam.

Summary of Selection Guidelines

Scenario	Pom zoo Qib	Lub ntsiab lus tseem ceeb
Kev kos duab sib sib zog nqus, sib sau ua ke, lossis kev pabcuam cryogenic	Qib 1	Superior ductility, toughness, thiab qis -kub stability
General engineering, welded qauv, los yog nruab nrab lub zog xav tau	Qib 2	Sib npaug lub zog / ductility, tus nqi -effectiveness, thiab dav dav
Chloride- nplua nuj lossis crevice corrosion- ib puag ncig yooj yim	Qib 1	Cov ntsiab lus qis impurity txo qhov kev pheej hmoo corrosion
Nruab nrab siab -kub (200-400 degree) lossis daim ntawv thov thauj khoom zoo li qub	Qib 2	Zoo zog tuav thiab creep kuj
Tus nqi - cov haujlwm tseem ceeb uas tsis yog - cov kev xav tau ua haujlwm tseem ceeb	Qib 2	Kev lag luam ntau dua thiab nyeemmuaj ily