Cov nyhuv ntawm hydrogen cov ntsiab lus ntawmtitanium alloysyog ib qho ntawm cov teeb meem tseem ceeb hauv cov ntaub ntawv kev tshawb fawb ntawm titanium alloys, feem ntau tshwm sim raws li kev pheej hmoo ntawm hydrogen embrittlement. Titanium muaj kev sib raug zoo heev rau hydrogen thiab yooj yim absorbs nws thaum smelting, kub ua hauj lwm, vuam, thiab nyob rau hauv kev pab cuam, ua rau ib tug deterioration ntawm kev ua tau zoo.
I. Hydrogen Content Control thiab Nqus Nqus Annealing
Cov ntsiab lus hydrogen ntau dhau los txo qhov cuam tshuam rau lub zog thiab lub zog tensile ntawm titanium yeeb nkab fittings, ua rau muaj zog brittleness. Yog li, cov ntsiab lus hydrogen hauv titanium yeeb nkab fittings feem ntau yuav tsum tsis pub ntau tshaj 0.015%. Yuav kom txo qis hydrogen nqus dej thaum kho cua sov, cov ntiv tes, khawb, roj, thiab lwm yam khoom seem yuav tsum tau muab tshem tawm ua ntej kev kho mob, thiab nws yuav tsum xyuas kom meej tias tsis muaj dej vapor hauv lub qhov cub. Yog tias cov ntsiab lus hydrogen tshaj qhov txwv, lub tshuab nqus tsev yuav tsum tau ua kom tshem tawm cov hydrogen.
II. Kev tswj ntawm Oxidation Contamination thiab Thaum tshav kub kub kho cov txheej txheem Thaum tshav kub kub tsis siab tshaj 540 degree, oxide zaj duab xis nyob rau saum npoo ntawm titanium fittings thickens maj mam; saum toj no qhov kub thiab txias, oxidation tus nqi nrawm nrawm, thiab qhov tshwm sim ntawm txheej txheej ntawm oxidation paug yog nkig, uas tuaj yeem yooj yim ua rau nto tawg lossis txawm tias tsis ua haujlwm ntawm qhov chaw. Cov txheej txheem rau tshem tawm cov pa paug txheej muaj xws li machining, acid pickling, thiab tshuaj polishing. Txhawm rau txo cov kab mob oxidation, lub sijhawm cua sov yuav tsum tau txo kom tsawg li ntau tau thaum ua raws li cov txheej txheem. Lub tshuab nqus tsev vacuum lossis roj inert-cov cua sov tiv thaiv yuav tsum yog qhov tseem ceeb, thiab cov cua sov ncaj qha hauv qhov qhib- cua sov yuav tsum zam lossis txo kom tsawg.
III. Cov yam ntxwv tseem ceeb ntawm Titanium Fittings
1. Corrosion Resistance: Txawm hais tias titanium yog ib qho thermodynamically active hlau uas muaj qhov sib npaug qis thiab muaj lub siab nyiam corrode, nws nthuav tawm kev ruaj ntseg zoo hauv oxidizing, nruab nrab, thiab tsis muaj zog ntawm cov xov xwm, muab kev tiv thaiv corrosion zoo tshaj.
2. Thaum tshav kub kub Resistance: tuaj yeem siv tsis tu ncua ntawm qhov kub ntawm 600℃lossis siab dua.
3. Tsis yog- sib nqus thiab tsis yog- tshuaj lom: Tsis ua hlau nplaum hauv cov hlau nplaum muaj zog thiab tsis yog - lom.
4. Tsawg elastic modulus: kwv yees li 57% ntawm cov hlau.
5. Gas absorption zog: Nws nkag siab nrog ntau yam ntsiab lus thiab cov tebchaw ntawm qhov kub thiab txias thiab muaj peev xwm nqus tau cov pa roj.
In summary, Hydrogen is one of the most dangerous interstitial elements in titanium alloys. Even trace amounts of hydrogen (>150 ppm) tuaj yeem ua rau hydrogen embrittlement thiab hydride nag lossis daus, ua rau cov khoom hloov pauv los ntawm cov pob txha tawg mus rau pob txha tawg. Yog li ntawd, nyob rau hauv tag nrho lub neej ntawm titanium alloys (smelting → ua → vuam → kev pab cuam), hydrogen cov ntsiab lus yuav tsum tau khaws cia nyob rau hauv tsis tshua muaj heev theem, thiab kev pheej hmoo ntawm hydrogen absorption yuav tsum tau tshem tawm tam sim ntawd los ntawm txoj kev xws li nqus degassing. Rau cov ntawv thov tseem ceeb xws li aerospace, nuclear fais fab, thiab kev sib sib zog nqus- dej hiav txwv, qhov tseeb ntawm hydrogen cov ntsiab lus tswj feem ntau ncaj qha txiav txim siab txog kev ntseeg ntawm cov khoom.
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