Dab tsi yog eutectic muaj pes tsawg leeg nyob rau hauv cov hlau carbon theem daim duab?

2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36

Cov eutectic concentration ntawm carbon yog 4.3%. Hauv kev xyaum tsuas yog siv cov alloys hypoeutectic. Cov hlau no ( carbon cov ntsiab lus ntawm 2.06% mus rau 4.3%) yog hu ua cam khwb cia hlau. Thaum kub ntawm ib hlau alloy los ntawm qhov no mus txog 2097 ºF (1147 ºC), nws muaj thawj austenite crystals thiab qee cov kua theem.

Tsis tas li lo lus nug yog, dab tsi yog qhov taw tes eutectic hauv hlau carbon daim duab?

Piv txwv li, nyob rau hauv lub hlau - carbon qhov system, lub sijhawm austenite tuaj yeem dhau los hloov pauv eutectoid los tsim ferrite thiab cementite, feem ntau hauv cov qauv lamellar xws li pearlite thiab bainite. Qhov no eutectoid taw tes tshwm sim ntawm 727 ° C (1, 341 ° F) thiab txog 0.76% carbon.

Qhov thib ob, qhov nyuaj tshaj plaws ntawm Fe C system yog dab tsi? Cementite yog qhov nyuaj tshaj qauv ntawm lub hlau carbon daim duab, tab sis lub hardness ntawm steel nce yog hais tias nws muaj martensite.

Tom qab ntawd, daim duab hlau carbon theem yog dab tsi?

Cov hlau - carbon daim duab (tseem hu ua hlau - carbon theem los yog daim duab equilibrium ) yog cov duab sawv cev ntawm cov microstructure xeev nyob ntawm qhov kub thiab txias (y axis) thiab carbon cov ntsiab lus (x axis). Qhov tseeb hlau - carbon daim duab yog deb tshaj qhov uas qhia ntawm no.

eutectic phase diagram yog dab tsi?

Lub binary eutectic theem daim duab piav qhia txog kev coj tus cwj pwm ntawm ob lub immiscible (unmixable) crystals los ntawm ib tug kiag li miscible (mixable) yaj, xws li olivine thiab pyroxene, los yog pyroxene thiab Ca plagioclase. Lawv yog cov immiscible vim lawv muaj cov qauv siv lead ua sib txawv.