Dab tsi yuav cuam tshuam rau qhov vuam ntawm titanium daim hlau?

Titanium thiab titanium alloy vuam muaj kev tiv thaiv nruj heev thaum vuam. Thaum cov ntsiab lus carbon ntawm cov vuam yog {{0}}.55%, cov yas ntawm cov vuam yuav luag ploj mus thiab dhau los ua cov khoom siv tawv heev. Kev kho cua sov tom qab vuam tsis tuaj yeem tshem tawm qhov brittleness. Lub teb chaws tus qauv txheej txheem txheej txheem tau teev tseg tias cov ntsiab lus carbon ntawm titanium alloy puag cov khoom yuav tsum tsis txhob ntau tshaj 0.1%, thiab cov ntsiab lus carbon ntawm cov vuam yuav tsum tsis pub tshaj cov pa roj carbon ntsiab lus ntawm lub hauv paus hlau. Muaj ntau cov ntsiab lus hauv titanium alloys, uas muaj kev cuam tshuam rau lub cev ntawm titanium. Cov pa roj carbon monoxide yog ib qho impurity hauv titanium thiab titanium alloys. Thaum cov ntsiab lus carbon tsawg dua 0.13%, cov pa roj carbon yog sib sib zog nqus hauv titanium, thiab lub zog vuam yog txwv. Muaj qee qhov kev txhim kho thiab qee qhov txo qis hauv plasticity, tab sis tsis muaj zog npaum li cov nyhuv ntawm oxygen thiab nitrogen. Txawm li cas los xij, thaum cov ntsiab lus carbon ntawm cov vuam txuas ntxiv, lub network TiC tshwm nyob rau hauv qhov vuam, thiab tus lej nce nrog cov ntsiab lus ntawm cov pa roj carbon ntau, ua rau cov yas ntawm cov vuam poob qis, thiab cov kab nrib pleb yog qhov tshwm sim hauv qhov kev txiav txim. ntawm welding kev nyuaj siab.

1. Qhov cuam tshuam ntawm carbon. Thaum lub sij hawm vuam txheej txheem ntawm titanium thiab titanium alloys, nyob rau hauv chav tsev kub, cov kua tee dej thiab molten pas dej ua ke hlau muaj ib tug muaj zog muaj peev xwm nqus hydrogen, oxygen, thiab nitrogen, thiab nyob rau hauv lub xeev cov khoom, cov gases muaj interacted nrog lawv. Raws li qhov kub thiab txias, lub peev xwm ntawm titanium thiab titanium alloys nqus hydrogen, oxygen, thiab nitrogen kuj nce ntxiv. Titanium pib nqus hydrogen ntawm 250 degree, oxygen ntawm 400 degree, thiab nitrogen ntawm 600 degree. Tom qab cov roj tau absorbed, nws yuav ncaj qha ua rau lub vuam sib txuas mus rau embrittle, uas yog ib qho tseem ceeb heev cuam tshuam rau lub vuam zoo.

2. Kev cuam tshuam ntawm hydrogen. Hydrogen yog ib qho tseem ceeb ntawm cov roj impurities uas muaj kev cuam tshuam loj heev rau cov khoom siv ntawm titanium. Kev hloov pauv hauv cov ntsiab lus hydrogen ntawm lub vuam muaj qhov cuam tshuam loj rau cov khoom siv ntawm cov vuam. Lub flake los yog koob zoo li TiH2 precipitated nyob rau hauv lub weld nce. Lub zog ntawm TiH2 tsawg heev, yog li cov nyhuv ntawm flaky lossis koob zoo li HiH2 yog tias cov khoom cuam tshuam tau txo qis; Kev hloov pauv hauv cov ntsiab lus hydrogen ntawm cov vuam tsis tshua muaj kev cuam tshuam rau kev txhim kho lub zog thiab txo cov yas.

3. Cov nyhuv ntawm oxygen. Lub hardness thiab tensile lub zog ntawm weld nce ntau, thiab cov pa oxygen ntawm cov weld pib nce linearly nrog qhov nce ntawm cov pa oxygen ntawm cov roj argon. Lub plasticity yog txo qis. Txhawm rau kom ntseeg tau tias qhov kev ua tau zoo ntawm cov pob qij txha welded, oxidation ntawm vuam seam thiab vuam qhov chaw kub-tshem yuav tsum tau nruj me ntsis tiv thaiv thaum lub vuam txheej txheem.

4. Cov nyhuv ntawm nitrogen. Nitrogen thiab titanium daim hlau yuav hnov ​​​​mob hnyav, ua rau nkig thiab tawv titanium nitride (TiN) ntawm qhov kub siab tshaj 700 degree . Ntxiv mus, qhov degree ntawm lattice distortion tshwm sim los ntawm kev tsim ntawm interstitial khoom tov ntawm nitrogen thiab titanium yog ntau dua qhov uas tshwm sim los ntawm tib tus nqi ntawm cov pa. Qhov tshwm sim yog qhov hnyav dua. Yog li ntawd, nitrogen yog qhov tseem ceeb tshaj li oxygen hauv kev txhim kho lub zog tensile thiab hardness ntawm kev lag luam ntshiab titanium welds thiab txo cov khoom yas ntawm welds. Thaum cov ntsiab lus nitrogen ntawm cov weld yog siab tshaj 0.13%, qhov vuam yuav yog vim dhau los ua nkig thiab ua rau tawg.