Qhov sib txawv tseem ceeb ntawm daim duab hlau carbon thiab TTT daim duab yog tias cov hlau carbon daim duab siv cov kev sib npaug, qhov TTT daim duab siv cov xwm txheej tsis sib npaug.
Iron-carbon daim duab thiab TTT daim duab yog cov kab kos duab tseem ceeb uas siv cov theem sib txawv ntawm cov hlau thiab alloys.
Iron Carbon Diagram yog dab tsi?
Iron carbon diagram yog daim duab qhia theem pab tau kom nkag siab txog cov theem sib txawv ntawm cov hlau thiab cam khwb cia hlau. Hlau thiab cam khwb cia hlau yog alloys ntawm hlau thiab carbon nrog rau lwm yam kab. Feem ntau, daim duab carbon hlau yog kos siv cov pa roj carbon ntau los ntawm qhov hnyav ntawm X axis thiab ntsuas kub ntawm Y axis.
Feem ntau, x axis ntawm daim duab qhia qhov hnyav feem pua ntawm cov pa roj carbon ntau li ntawm 0% txog 6.67%. Qhov no yog vim qhov nyuaj, uas txwv qhov kev tshawb nrhiav ntawm Fe3C yuav tsum tau tsom mus txog 6.67 qhov hnyav feem pua ntawm cov pa roj carbon. Hauv daim duab qhia theem no, txog li 0.008% ntawm qhov hnyav ntawm cov pa roj carbon tsuas yog qhia cov hlau ntshiab lossis hlau. Cov hlau no muaj nyob rau hauv daim ntawv alpha-ferrite ntawm chav tsev kub.
Nyob rau theem ob, los ntawm 0.008% mus rau 2.14% cov ntsiab lus carbon los ntawm qhov hnyav qhia cov hlau, hlau-carbon alloy. Qhov no kuj qhia tau ntau qib ntawm cov hlau uas muaj npe xws li cov hlau tsis tshua muaj hlau lossis cov hlau me me, cov pa roj carbon nruab nrab, thiab cov pa roj carbon siab.
Thaum qhov nce ntawm cov ntsiab lus carbon mus rau saum 2.14%, peb tuaj yeem soj ntsuam cov theem ntawm cov hlau cam khwb cia hauv daim duab theem. Cam khwb cia hlau yog nyuaj heev. Txawm li cas los xij, nws muaj brittleness uas txwv tsis pub siv cov hlau no thiab cov txheej txheem rau kev tsim.
TTT Diagram yog dab tsi?
TTT daim duab sawv cev rau lub sijhawm-kub-hloov daim duab. Daim duab no tseem hu ua isothermal transformation diagram. Nws muab cov kinetics ntawm isothermal transformations. Nws feem ntau yog siv rau cov hlau, thiab nws yog ib qho tseem ceeb raws li daim duab transformation rau kev hloov tsis sib npaug. Ntxiv rau cov hlau, muaj martensite, bainite, thiab lwm yam, uas tuaj yeem pom hauv daim duab no. Cov no yog hu ua non-equilibrium hlau vim lawv tsis tuaj yeem tsim los ntawm kev ua kom txias tas mus li; Yog li, peb tsis tuaj yeem piav qhia lawv cov khoom siv cov duab hloov pauv theem.
Daim duab TTT ntawm cov hlau muaj cov ntawv thov tseem ceeb xws li austempering, martempering patenting, thiab isothermal annealing uas feem ntau muaj txiaj ntsig hauv kev lag luam rau kev ua tiav ntawm cov khoom tshwj xeeb hauv steel.
Txawm li cas los xij, daim duab TTT ntawm cov hlau siv tau rau ib qho kev sib xyaw, thiab yog tias muaj qhov sib txawv, cov phiaj xwm, thiab cov nkhaus kuj txawv. Ntxiv mus, daim duab yog to taub tsuas yog tias steel tam sim ntawd txias los ntawm austenitizing kub thiab yog nyob tas li thaum lub sij hawm ua tiav ntawm kev hloov. Tsis tas li ntawd, daim duab TTT ntawm cov hlau yog qhov tseem ceeb hauv kev piav qhia ntau lub ntsiab lus uas muaj feem xyuam rau kev sib npaug ntawm cov kinetic thiab tsis sib npaug ntawm cov hlau.
Dab tsi yog qhov txawv ntawm Iron Carbon Diagram thiab TTT Diagram?
Ob qho tib si, daim duab hlau-carbon thiab TTT daim duab, yog daim duab qhia theem tseem ceeb. Qhov sib txawv tseem ceeb ntawm daim duab hlau carbon thiab TTT daim duab yog tias cov hlau carbon daim duab siv cov kev sib npaug, qhov TTT daim duab siv cov duab tsis sib npaug los kos cov duab kos. Ntxiv mus, nyob rau hauv daim duab carbon hlau, qhov kub thiab txias yog plotted tiv thaiv cov pa roj carbon muaj pes tsawg leeg, whereas nyob rau hauv ib tug TTT daim duab, qhov kub yog plotted rau lub sij hawm.
Cov duab hauv qab no nthuav tawm qhov sib txawv ntawm daim duab hlau carbon thiab TTT daim duab hauv daim ntawv qhia rau kev sib piv ntawm ib sab.
Summary – Iron Carbon Diagram vs TTT Diagram
Daim duab qhia cov hlau carbon yog ib daim duab qhia theem pab kom nkag siab txog cov theem sib txawv ntawm cov hlau thiab cam khwb cia hlau. TTT daim duab sawv cev rau lub sij hawm-temperature-transformation daim duab. Qhov sib txawv tseem ceeb ntawm daim duab hlau carbon thiab TTT daim duab yog tias cov hlau carbon daim duab siv cov xwm txheej sib npaug, qhov TTT daim duab siv cov xwm txheej tsis sib npaug.
