Qee cov yam ntxwv uas yuav tsum tau them nyiaj rau hauv kev tsom xam ntawm cov khoom siv microstructure los ntawm metallographic microscope
Lub optical metallographic qauv ntawm metallographic microscope yog lath-zoo li, uas yog lath martensitic qauv. X-ray diffraction theem tsom xam thiab kis tau tus mob qhia tau hais tias tseem muaj khaws cia austenite nyob rau hauv lub quenched qauv, thiab cov retained austenite mas muaj nyob rau hauv lub martensitic qauv. Nyob nruab nrab ntawm lub cev laths, cov ntsiab lus austenite residual tau kuaj ntau los ntawm X-ray txoj kev ua 4.5 feem pua. Tom qab quenching, low-temperature tempering tuaj yeem txhim kho qhov ruaj khov ntawm cov austenite ntawm martensite laths thiab txhim kho lub zog thiab toughness ntawm cov khoom. Tsis tas li ntawd, austenite zaj duab xis ntawm lub martensite laths yog ib theem ductile, thiab metallographic microscope yuav undergo yas deformation thiab theem transformation-induced yas nyhuv (TRIP nyhuv) nyob rau hauv qhov kev txiav txim ntawm sab nraud quab yuam, uas siv lub zog, hinders lub expansion ntawm tawg. los yog ua rau Cracks yog tag nrho passivated kom tau ib tug zoo ua ke ntawm lub zog thiab toughness. Yog li ntawd, thaum lub zog tom qab quenching thiab tempering yog siab, qhov cuam tshuam toughness tus nqi kuj yog siab, uas muaj feem xyuam rau lub xub ntiag ntawm retained austenite nyob rau hauv lub martensite tsim tom qab quenching. Hauv kev xyaum hauv kev tshawb fawb metallographic, nws yog qhov zoo heev uas yuav tsum tau them nyiaj rau cov yam ntxwv hauv qab no ntawm cov khoom siv microstructure, tshwj xeeb tshaj yog rau cov txheej txheem tsim thiab nruj ntawm cov phiaj xwm kev sim, thiab txo qis kev nkag siab yuam kev thiab tsis tsim nyog tsom xam ntawm qhov pom tseeb microstructure tau.
1. Multi-scale ntawm cov khoom microstructure: qib atomic thiab molecular, crystal defect theem xws li dislocation, grain microstructure theem, mesostructure theem, macrostructure theem, thiab lwm yam.;
2. Inhomogeneity ntawm cov khoom siv microscope qauv: qhov tseeb microstructure feem ntau muaj inhomogeneity nyob rau hauv geometry, inhomogeneity nyob rau hauv tshuaj muaj pes tsawg leeg, inhomogeneity nyob rau hauv microscopic zog (xws li microhardness, lub zos electrochemical tej zaum), thiab lwm yam.
3. Lub directionality ntawm lub microstructure ntawm cov khoom: nrog rau cov anisotropy ntawm lub grain zoo, lub directionality ntawm lub low-magnification qauv, crystallographic orientation, lub directionality ntawm macroscopic zog ntawm cov khoom, thiab lwm yam., uas yuav tsum tau soj ntsuam thiab cais cais;
4. Qhov sib txawv ntawm microstructure ntawm cov ntaub ntawv: kev hloov hauv tshuaj lom neeg muaj pes tsawg leeg, lwm yam kev hloov pauv thiab lub sijhawm hloov pauv uas ua rau muaj kev hloov pauv thiab cov ntaub so ntswg hloov pauv tuaj yeem ua rau muaj kev hloov pauv hauv microstructure ntawm cov ntaub ntawv. Yog li ntawd, nyob rau hauv tas li ntawd mus rau lub qualitatively thiab ntxiv rau kom muaj nuj nqis tsom xam, yuav tsum tau them rau seb puas yuav tsum tau rau kev tshawb fawb ntawm solid-state theem hloov txheej txheem, microstructure evolution kinetics thiab evolution mechanism;
5. Qhov ua tau fractal yam ntxwv ntawm cov khoom siv microstructure thiab cov kev daws teeb meem-nyob ntawm cov yam ntxwv uas yuav muaj nyob rau hauv cov kev soj ntsuam metallographic tshwj xeeb: nws yuav ua rau kom muaj nuj nqis txheeb xyuas cov txiaj ntsig ntawm microstructure muaj zog nyob ntawm cov duab daws teeb meem. Kev saib xyuas ntxiv yuav tsum tau them rau qhov no thaum ua qhov kev soj ntsuam ntau ntawm morphology thiab khaws cia thiab ua cov duab digital cov ntaub ntawv ntawm microstructure;
6. Cov kev txwv ntawm kev tshawb fawb tsis muaj nuj nqis ntawm microstructure ntawm cov ntaub ntawv: Txawm hais tias kev tshawb fawb zoo ntawm microstructure tuaj yeem ua tau raws li cov kev xav tau ntawm cov khoom siv engineering, kev tshuaj xyuas thiab kev tshawb fawb ntawm cov ntaub ntawv tshawb fawb ib txwm xav kom muaj nuj nqis ntawm kev txiav txim siab ntawm geometry ntawm microstructure thiab kev soj ntsuam yuam kev. ntawm qhov tau txais kev txheeb xyuas qhov txiaj ntsig.
