Qhov sib txawv tseem ceeb ntawm pearlite thiab bainite yog pearlite muaj alternating txheej ntawm ferrite thiab cementite whereas lub bainite muaj ib tug phaj zoo li microstructure.
Cov npe pearlite thiab bainite hais txog ob qhov sib txawv ntawm cov hlau. Cov qauv no tsim thaum peb hloov pauv rau austenite los ntawm kev hloov qhov kub kom haum. Cia peb tham txog qhov sib txawv ntxiv ntawm pearlite thiab bainite.
Pearlite yog dab tsi?
Pearlite yog ib hom microstructure hauv cov hlau uas muaj ob-txheej txheej ntawm alternating txheej ntawm ferrite thiab cementite. Ferrite thiab cementite yog ob qhov sib txawv ntawm cov hlau. Qhov microstructure no tshwm sim hauv steel thiab cam khwb cia hlau. Thaum peb txias cov hlau maj mam, qhov microstructure no ua los ntawm cov tshuaj tiv thaiv eutectoid (ib theem peb cov tshuaj tiv thaiv uas, ntawm qhov txias, cov khoom hloov pauv mus rau ob theem khoom nyob rau tib lub sijhawm). Qhov no yog vim hais tias, thaum lub caij txias qeeb, austenite txias hauv qab nws qhov kub thiab txias (727 ° C).
Daim duab 01: Pearlite Structure
Steels nrog pearlite microstructure muaj eutectoid muaj pes tsawg leeg ntawm hlau thiab carbon. Yog li ntawd, cov hlau uas muaj pearlite los yog ze-pearlite microstructures tuaj yeem yooj yim kos rau hauv cov xov hlau nyias. Feem ntau, cov xov hlau no tau muab khi ua ke kom cov neeg muag khoom tuaj yeem muag lawv li piano xov hlau thiab hlua rau kev ncua txuas hniav.
Bainite yog dab tsi?
Bainite yog hom microstructure hauv cov hlau uas muaj cov qauv zoo li phaj. Cov qauv no tsim thaum cov hlau nyob ib ncig ntawm 125-550 ° C. Tsis tas li ntawd, nws kuj tsim thaum austenite txias kom txog thaum nws dhau qhov kub ntawm cov qauv austenite tsis ruaj khov (thermodynamically tsis ruaj khov) thaum piv nrog ferrite lossis cementite.
Daim duab 02: Bainite Structure
Cov qauv bainite feem ntau muaj cov cementite thiab ferrite, thiab cov ferrite no nplua nuj nrog dislocations. Yog li ntawd, qhov loj ntom ntawm dislocations hauv ferrite ua rau nws nyuaj.
Qhov txawv ntawm Pearlite thiab Bainite yog dab tsi?
Pearlite yog ib hom microstructure hauv cov hlau uas muaj ob txheej txheej ntawm alternating txheej ntawm ferrite thiab cementite. Nws tsim thaum austenite txias hauv qab nws qhov kub thiab txias (727 ° C). Ntxiv mus, cov qauv no tshwm sim hauv steel thiab cam khwb cia hlau. Ntawm qhov tod tes, Bainite yog ib hom microstructure hauv steel uas muaj cov qauv zoo li phaj. Cov qauv yog qhov sib txawv tseem ceeb ntawm pearlite thiab bainite. Tsis tas li ntawd, bainite cov ntaub ntawv thaum austenite txias: kom txog thaum nws dhau qhov kub ntawm cov qauv austenite tsis ruaj khov (thermodynamically tsis ruaj khov). Tsis tas li ntawd, cov qauv no kuj tshwm sim hauv steel.
Summary – Pearlite vs Bainite
Pearlite thiab Bainite yog ob lub ntsiab microstructures hauv cov hlau. Qhov txawv ntawm pearlite thiab bainite yog tias pearlite muaj alternating txheej ntawm ferrite thiab cementite whereas lub bainite muaj ib tug phaj zoo li microstructure.
