Titanium bars, valued for their high strength-to-density ratio and exceptional corrosion resistance, are critical components in demanding industrial applications. Txawm li cas los xij, qhov kev sib tw tseem ceeb tau tshwm sim: qhov tshwm sim ntxov ntxov ntawm cov kab mob microcracks hauv cov kab uas yav dhau los dhau los tsis yog - kev ntsuas kev puas tsuaj. Qhov tshwm sim no qhia txog qhov tsis ua haujlwm latent hauv paus hauv cov khoom siv keeb kwm tsim khoom, tshwj xeeb yog nws cov txheej txheem thermomechanical. Qhov tsis muaj qhov tsis xws luag thaum pib kuaj ultrasonic qhia tias cov kev tsis haum no pib ntawm qib microstructural, hauv qab kev daws teeb meem ntawm cov txheej txheem tswj kev tswj hwm zoo.
Ib qho laj thawj tseem ceeb ntawm metallurgical yog feem ntau taug qab rau qhov tsis txaus deformation thaum thawj forging. Tsis txaus tus ntoo khaub lig-forging, los yog tsis txaus txo ib tug pass, tiv thaiv kom tiav dynamic recrystallization thiab refinement ntawm cov ua ntej beta grain qauv. Qhov no ua rau muaj kev ntxhib los mos -grained microstructure, uas cuam tshuam ob lub zog tensile thiab tawg toughness. Tsis tas li ntawd, kev ua haujlwm dov tom ntej tuaj yeem ua kom cov khoom siv anisotropy. Thaum superimposed raws li ib tug twb heterogeneous qauv, cov kev taw qhia cov cuab yeej tsis sib haum xeeb tsim txoj kev nyiam rau kev pib tawg thiab nthuav tawm raws li kev siv lossis kev ntxhov siab.
Cov kev txwv ntawm kev tshuaj xyuas ultrasonic rau cov xwm txheej zoo li no yog qhov tseem ceeb. Coarse alpha theem colonies lossis loj ua ntej beta nplej nyob rau hauv titanium microstructure ua raws li cov chaw tawg rau siab - zaus suab tsis. Qhov no ultrasonic attenuation thiab backscatter tsim cov suab nrov acoustic, uas tuaj yeem npog lub teeb liab los ntawm incipient microcracks lossis hloov maj mam discontinuities. Yog li ntawd, daim ntawv tshaj tawm kev soj ntsuam "huv" tsis tuaj yeem lav qhov tsis muaj qhov tseem ceeb ntawm microstructural imperfections uas ua raws li kev ntxhov siab concentrators.
Kev txo qis qhov teeb meem no yuav tsum muaj kev tswj hwm nruj rau tag nrho cov saw hlau ua haujlwm. Melt chemistry yuav tsum tau tswj xyuas kom zoo kom tsis txhob muaj cov theem embrittling. Lub sijhawm ua haujlwm kub, suav nrog kev txo qis ntawm qhov sib piv thiab qhov sib cuam tshuam ntawm qhov kub thiab txias, yuav tsum tau tsim kom ua tau raws li qhov sib xws, zoo -cov qauv isotropic grained. Thaum kawg, qhov kawg ntawm kev kho cua sov tsis yog qhov tseem ceeb rau kev txo kev ntxhov siab thiab theem stabilization, kom ntseeg tau tias cov microstructure tsim muaj kev pom zoo rau kev qaug zog thiab kev ntxhov siab -corrosion cracking.
Thaum kawg, daws qhov kev sib tw ntawm microcracks hauv titanium tuav xav tau kev hloov pauv los ntawm kev cia siab rau kev soj ntsuam zaum kawg mus rau txheej txheem txheej txheem metallurgy. Kev ua tau zoo yuav tsum raug tsim kho rau hauv cov khoom siv los ntawm kev qhuab qhia ntawm txhua qhov kev tsim khoom sib txawv, los ntawm ingot mus rau qhov tiav bar. Advanced ntau traceability thiab microstructural tsom xam yog indispensable rau correlating ua keeb kwm nrog kev ua tau zoo, yog li xyuas kom meej cov qauv ntawm cov khoom tseem ceeb hauv kev pab cuam.
