Oxygen Cov ntsiab lus ntawm Qib 2 Titanium - Kev Paub

1. Cov ntsiab lus oxygen ntawm qib 2 Titanium

Qib 2 titanium (kev lag luam ntshiab titanium, UNS R50400) yog txhais los ntawm kev txwv cov pa oxygen nruj raws li cov qauv thoob ntiaj teb xws liASTM B 348 Cov Lus Qhia Tshwj Xeeb(rau titanium thiab titanium alloy tuav) thiabASTM B265(rau titanium thiab titanium alloy nplooj ntawv / daim hlau).

Qhov siab tshaj plaws oxygen cov ntsiab lus ntawm Qib 2 titanium yog0.25% ntawm qhov hnyav.

Qhov kev txwv no yog qhov sib txawv tseem ceeb ntawm qis dua - qib purity (piv txwv li, Qib 1 muaj cov pa oxygen max ntawm 0.18%) thiab siab dua - qib zog (piv txwv li, Qib 3 muaj cov ntsiab lus oxygen max ntawm 0.35%). Oxygen yog txhob txwm tswj los ua ib qho interstitial alloying caij kom sib npaug ntawm cov khoom siv thiab kev ua haujlwm.

2. Cov ntsiab lus ntawm cov pa oxygen rau lub zog thiab tawv ntawm qib 2 Titanium

Oxygen ua raws li ib tugntxiv dag zog rau interstitial keebhauv kev lag luam ntshiab titanium, tab sis nws cov ntsiab lus muaj kev lag luam -tawm ntawm lub zog thiab tawv:

Kev cuam tshuam rau lub zog

Nyob rau hauv tus txheej txheem txwv (tsawg dua los yog sib npaug rau 0.25 wt%), qhov nce ntawm cov pa oxygen ua rau muaj kev nce ntxiv hauv lub zog ntawm Qib 2 titanium. Qhov no yog vim hais tias cov pa atoms nyob rau hauv interstitial qhov chaw nyob rau hauv lub hexagonal ze -packed (HCP) crystal qauv ntawm titanium, ua rau lattice distortion thiab impeding lub zog ntawm dislocations. Yog li ntawd, ob leegtensile zogthiabyield zognce proportionally nrog cov ntsiab lus oxygen. Piv txwv li, Qib 2 nrog cov ntsiab lus oxygen nyob rau sab sauv txwv (0.25%) feem ntau muaj lub zog tawm los ntawm ~ 275 MPa, thaum qib 2 cov qauv nrog cov pa oxygen tsawg (piv txwv li, 0.15%) tuaj yeem muaj lub zog tawm los ntawm ~ 240 MPa.

Kev cuam tshuam rau Toughness

Qhov nce hauv cov ntsiab lus ntawm cov pa oxygen yog nrog los ntawm kev txo qhov toughness thiab ductility ntawm Qib 2 titanium. Cov pa oxygen ntau dhau (txog los yog tshaj li 0.25% txwv) ua rau cov khoom tawg yooj yim, vim tias cov txheej txheem lattice ua rau nws nyuaj rau cov khoom kom deform plastically ua ntej tawg. Qhov no manifests raws li ib tug txo nyob rau hauvelongation ntawm tawgthiabtxo qhov chaw. Piv txwv li, Qib 2 nrog 0.25% oxygen muaj qhov elongation ntawm ~ 20-25%, qhov qis dua -oxygen variant yuav muaj qhov elongation ntawm ~ 28-30%. Tshaj li tus qauv txwv, cov pa oxygen tuaj yeem ua rau embrittlement, ua rau muaj kev cuam tshuam loj ntawm cov khoom tsis kam rau kev cuam tshuam thiab qaug zog.

3. Mechanical Properties ntawm Qib 2 Titanium ntawm qhov sib txawv

Cov khoom siv kho tshuab ntawm Qib 2 titanium yog qhov kub thiab txias- nyob ntawm, nrog rau nws qhov kev ua tau zoo sib txawv ntawm qhov kub thiab txias, ambient, thiab siab kub ntau yam. Hauv qab no yog cov ntaub ntawv ntawm cov cuab yeej cuab tam (raws li ASTM cov qauv) rau Qib 2 titanium ntawm qhov kub thiab txias:

Kub	Tensile zog (MPa)	Yield zog (MPa)	Elongation ntawm Break (%)	Modulus ntawm Elasticity (GPa)
-270℃(Cryogenic)	550–600	480–520	15–20	110–115
-196℃(Kua Nitrogen Temp)	500–540	420–460	18–22	105–110
25℃(Ambient Temp)	450–500	275–310	20–25	100–105
100 degree	400–440	240–270	22–28	95–100
200 degree	380–420	220–250	25–30	90–95
300 degree	350–390	200–230	28–32	85–90
400 degree	320–360	180–210	30–35	80–85

Cov ntsiab lus tseem ceeb ntawm qhov kub thiab txias -Kev Ua Tau Zoo:

Cryogenic kub (-270℃rau -196 degree): Qib 2 titanium nthuav tawm cov kev ua tau zoo ntawm kev ua haujlwm cryogenic- nws lub zog nce ntau dua piv rau qhov kub thiab txias, thaum ductility yog tswj ntawm qhov tsim nyog. Qhov no ua rau nws tsim nyog rau qis - daim ntawv thov kub xws li cov kua roj cia tank.

Ambient kub (25 degree): Cov khoom ua tiav kev sib xyaw ua ke ntawm lub zog thiab ductility, uas yog lub hauv paus rau nws txoj kev siv dav hauv kev ua tshuaj, marine engineering, thiab cov khoom siv kho mob.

Kev kub siab (100℃txog 400 degree): Lub zog maj mam txo nrog nce kub, tab sis ductility nce me ntsis. Qib 2 titanium tuaj yeem siv tsis tu ncua ntawm qhov kub txog li 315 degree; saum toj no 400 degree, nws oxidation kuj thiab mechanical stability poob sharply, txwv nws ntev -lub sij hawm kev pab cuam nyob rau hauv siab - kub ib puag ncig.