Kev kho mob thiab kev laus yog cov kauj ruam tseem ceeb hauv kev kho cua sov ntawmtitanium thiab titanium alloys. Cov kev kho mob muaj xws li cua sov lub alloy, tuav nws ntawm ib tug tshwj xeeb kub, thiab ces txias nws sai, thaum laus yuav tuav lub workpiece ntawm ib tug tshwj xeeb kub ntau yam rau ib lub sij hawm ntawm lub sij hawm tom qab kev kho mob, ua raws li los ntawm cua txias. Txoj kev kho cua sov no yog tsim rau ntau yam ntawm titanium alloys, xws li nyob ze - alloys, +compound alloys, + alloys, thiab heat-treatable alloys. Kev kho mob thiab kev laus yog qhov tseem ceeb rau kev kho cua sov ntawm titanium thiab titanium alloys, ua tiav cov khoom siv kho kom zoo dua qub los ntawm cua sov, tuav, thiab cua txias sai.
Lub hom phiaj ntawm kev daws kev daws teeb meem yog khaws cov theem metastable uas ua rau kev ua haujlwm nyuaj. Nyob ze - thiab + titanium alloys, qhov kev kho mob no yog tsom rau khaws cia martensitic ', ", los yog ib qho me me ntawm metastable theem. Cov kev kho mob khaws cov theem metastable nyob rau hauv ntau yam titanium alloys kom ua tau hauj lwm hardening.
Kev kho qhov kub thiab txias yog feem ntau teem 40-100℃hauv qab ntawm theem hloov pauv kom ntseeg tau tias tsim kom muaj qhov sib piv ntawm thawj thiab theem. Tom qab ntawd, los ntawm kev ua kom txias sai (feem ntau yog los ntawm dej lossis roj quenching), theem hloov mus rau theem metastable. Nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov tias cov txheej txheem quenching rau ob hom alloys yuav tsum ceev nrooj los tiv thaiv cov nucleation ntau dhau thiab kev loj hlob ntawm theem ntawm cov qoob loo ntawm cov thawj theem, uas yuav cuam tshuam rau cov khoom siv tom qab quenching. Feem ntau, quenching ncua yuav tsum tsis pub tshaj 10 vib nas this, nrog rau cov kev cai nruj dua rau cov ntawv nyias. Tsis tas li ntawd, kev saib xyuas tshwj xeeb yuav tsum tau ua kom tsis txhob quenching distortion thaum ua cov complex-zoo li tus workpieces los yog nyias nyias. Cov tshuaj kho qhov kub thiab txias yuav tsum tau tswj nruj me ntsis kom tiv thaiv kev ua haujlwm sib txawv.
Piv txwv li:
Rau Gr5 titanium alloy, kev daws teeb meem feem ntau ua nyob rau hauv qhov kub ntawm 910℃txog 940 degree. Lub sij hawm tuav nyob ntawm lub phaj thickness thiab feem ntau yog 0.5 mus rau 2 teev kom paub meej tias cua sov. Qhov no yog ua raws li dej quenching los suppress lub decomposition ntawm lub siab -kub theem thiab tau ib tug metastable microstructure. Kev laus kev kho mob feem ntau ua nyob rau hauv qhov kub ntawm 450℃mus rau 650 degree, nrog rau lub sij hawm tuav txawv nyob ntawm qhov kub ntawm qhov kev laus. Rau qis- qhov kub thiab txias (450℃txog 550 degree), lub sijhawm tuav feem ntau yog 8 mus rau 24 teev, feem ntau los txhim kho lub zog thiab hardness; Rau siab - kub aging (550℃-650 degree), lub sij hawm tuav feem ntau yog 6-12 teev, feem ntau los txhim kho toughness thiab ductility.
Rau Gr7 titanium alloys, lub hom phiaj ntawm kev kho kev daws teeb meem yog ua kom cov alloy lub zog thiab hardness. Nws yog feem ntau ua nyob rau hauv qhov kub ntawm 920℃-980 degree, nrog lub sij hawm tuav ntawm 0.5-1 teev, ua raws li los ntawm ceev ceev. Kev laus kev kho mob yog ib qho kev ntxiv dag zog ntxiv tom qab kev kho mob. Nws yog feem ntau nqa tawm ntawm qhov kub thiab txias xws li 500℃txog 600℃rau 2 mus rau 4 teev kom ntseeg tau tias kev faib tawm ntawm cov nag lossis daus theem thiab ntxiv txhim kho cov khoom siv hlau alloy.
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