Ib tug xov tooj ntawm cov yam ntxwv yuav tsum tau txiav txim siab thaum soj ntsuam lub microstructure ntawm cov ntaub ntawv siv ib tug metallographic microscope
Metallographic microscope optical metallographic lub koom haum yog lath-zoo li, rau lub lath martensite organisation, X-ray diffraction lub cev tsom xam thiab kis tau tus mob qhia tau hais tias tseem muaj residual austenite nyob rau hauv lub quenched lub koom haum, cov residual austenite mas muaj nyob rau hauv lub martensite ntawm laths, thiab Cov ntsiab lus ntawm cov residual austenite yog 4.5% thaum kuaj los ntawm X-ray txoj kev quantitatively. Kev kho cua kub qis tom qab quenching tuaj yeem txhim kho kev ruaj ntseg ntawm cov austenite residual ntawm martensite slats thiab txhim kho lub toughness ntawm cov khoom. Tsis tas li ntawd, cov austenite zaj duab xis uas muaj nyob nruab nrab ntawm cov martensite slats, yog lub hardness theem, metallurgical microscopy nyob rau hauv lub sab nraud quab yuam yuav tshwm sim nyob rau hauv cov yas deformation thiab theem hloov induced plasticity nyhuv (TRIP nyhuv, haus zog, impede lub expansion ntawm tawg los yog tawg * * passivation, kom tau ib tug zoo zog toughness nrog yog li ntawd, tom qab quenching thiab tempering ntawm lub zog siab dua nyob rau tib lub sij hawm, qhov cuam tshuam toughness tus nqi kuj yog siab dua, uas yog muaj feem xyuam rau lub xub ntiag ntawm residual austenite nyob rau hauv lub martensitic lub koom haum tsim tom qab quenching. Nyob rau hauv qhov tseeb metallographic tsom xam ntawm txoj kev tshawb no, tsim nyog mloog rau cov nram qab no cov yam ntxwv ntawm cov khoom microstructure yog heev pab tau, tshwj xeeb tshaj yog, los pab lub systematic thiab nruj tsim ntawm kev sim cov kev pab cuam, raws li zoo raws li kom txo tau lub meej microstructure morphology ntawm kev to taub yuam kev thiab qhov muaj peev xwm ntawm qhov tsis tsim nyog tsom xam.
1, cov khoom siv microstructure ntawm ntau cov nplai: qib atomic thiab molecular, dislocations thiab lwm yam crystal defects theem, grain microstructure theem, qib microstructure, macroscopic koom haum qib, macrostructure theem;
2, cov khoom siv microscopic lub koom haum qauv ntawm inhomogeneity: qhov tseeb microstructure feem ntau tshwm sim nyob rau hauv lub geometric morphology ntawm inhomogeneity, tshuaj muaj pes tsawg leeg ntawm inhomogeneity, micro-properties (xws li micro-hardness, lub zos electrochemical muaj peev xwm) inhomogeneity thiab hais txog;
3, lub directionality ntawm lub microstructure ntawm cov khoom: xws li grain morphology anisotropy, lub directionality ntawm lub low-fold lub koom haum, crystallography xaiv tshwj xeeb tshaj yog orientation, lub directionality ntawm lub macroscopic zog ntawm cov khoom thiab lwm yam directionality, yuav tsum tau soj ntsuam thiab characterized nyias;
4, cov khoom siv microstructure variability: tshuaj lom neeg muaj pes tsawg leeg hloov, lwm yam tseem ceeb thiab lub sij hawm hloov los ntawm cov theem hloov thiab cov ntaub so ntswg evolution yuav ua rau cov kev hloov nyob rau hauv lub microstructure ntawm cov khoom, yog li, ntxiv rau qhov yuav tsum tau rau qualitative thiab quantitative tsom xam ntawm static microstructure morphology. , kev saib xyuas yuav tsum tau them rau seb puas muaj cov txheej txheem kev hloov pauv hauv lub xeev, microstructure evolution kinetics thiab evolution ntawm cov txheej txheem ntawm kev xav tau kev tshawb fawb;
5, cov khoom siv microstructure yuav muaj fractal (fractal) cov yam ntxwv thiab cov kev soj ntsuam metallographic tej zaum yuav muaj kev daws teeb meem-nyob ntawm cov khoom: yuav ua rau kom muaj nuj nqis ntawm nws cov txiaj ntsig microstructure yog nyob ntawm cov duab daws teeb meem, thaum kev tsom xam ntau ntawm cov khoom tawg ntawm cov ntaub so ntswg. morphology, nrog rau cov microstructure ntawm cov duab cov ntaub ntawv rau kev khaws cia thiab kev ua haujlwm ntawm qhov kev mloog ntau dua yuav tsum tau them rau qhov no;
6, cov kev txwv ntawm kev kawm tsis muaj nuj nqis ntawm microstructure ntawm cov ntaub ntawv: txawm hais tias qhov kev kawm zoo ntawm microstructure qee zaum tseem tuaj yeem ua tau raws li cov kev xav tau ntawm cov khoom siv engineering, tab sis cov ntaub ntawv tshawb fawb thiab kev tshawb fawb yog ib txwm xav tau los txiav txim ntau qhov kev tshawb fawb ntawm microstructure geometry thiab. raws li cov txiaj ntsig ntawm kev txheeb xyuas ntau ntawm qhov kev ntsuas yuam kev.
