1. Qhov tshwm sim ntawm ntau dhau inoculation ntawm hlau castings
1.1 Yog hais tias qhov inoculation ntau dhau lawm, cov ntsiab lus ntawm silicon yuav siab, thiab yog tias nws tshaj ib qho nqi, silicon brittleness yuav tshwm sim. Yog tias cov ntsiab lus ntawm silicon kawg tshaj li tus qauv, nws tseem yuav ua rau thickening ntawm A-hom graphite; nws kuj yog qhov ua rau shrinkage thiab shrinkage, thiab tus nqi ntawm matrix F yuav nce; tseem yuav muaj tsawg pearlite. Yog tias muaj ntau dua ferrite, lub zog yuav txo qis dua.
1.2 Ntau dhau ntawm inoculation, tab sis cov ntsiab lus ntawm silicon kawg tsis tshaj tus qauv, yooj yim los tsim cov kab noj hniav thiab shrinkage, cov qauv ua kom zoo dua qub, thiab lub zog zoo tuaj.
1.3 Yog hais tias tus nqi ntawm inoculation loj dhau lawm, nag lossis daus ntawm graphite yuav txo thaum lub sij hawm solidification txheej txheem, expansion ntawm cam khwb cia hlau yuav txo, qhov nce ntawm eutectic pawg yuav ua rau noj tsis zoo, thiab cov kua shrinkage yuav loj, ua rau shrinkage. porosity.
1.4 Ntau dhau ntawm inoculation ntawm nodular hlau yuav ua rau muaj pes tsawg leeg ntawm eutectic pawg thiab ua rau kom lub nyiam ntawm loosening, yog li ntawd muaj ib tug tsim nyog tus nqi ntawm inoculation. Nws yog ib qho tsim nyog yuav tau saib seb tus naj npawb ntawm cov eutectic pawg tsawg dhau los yog loj dhau nyob rau hauv metallography, uas yog, nyob rau hauv siab Vim li cas thiaj li xyuam xim rau cov inoculum, thiab yog vim li cas vim li cas inoculum ntawm hypereutectic ductile hlau loj dhau yuav ua rau graphite. ntab.
2. Inoculation mechanism ntawm hlau castings
2.1 Cov hlau hlau shrinkage feem ntau yog tshwm sim los ntawm kev ua kom txias qeeb thiab lub sij hawm ruaj khov ntev, uas ua rau graphite distortion nyob rau hauv nruab nrab ntawm cov casting, txo cov pob, thiab cov pob graphite loj. Tus nqi ntawm magnesium residual, tswj cov nyiaj seem ntawm lub ntiaj teb tsis tshua muaj, ntxiv cov kab lus, ntxiv dag zog rau inoculation thiab lwm yam kev ntsuas.
2.2 Thaum inoculating nyob rau hauv ductile hlau, silicon cov ntsiab lus ntawm cov thawj molten hlau yog tsawg, uas muab rau koj nrog rau cov kev mob kom inoculation. Tus nqi ntawm inoculation ntxiv los ntawm cov neeg sib txawv yuav txawv. Tsuas yog, tab sis kuj tsis txaus.
3. Tus nqi ntawm inoculant ntxiv rau hlau castings
3.1 Lub luag haujlwm ntawm cov inoculant: txhawb nqa graphitization, txhim kho cov duab faib thiab qhov loj ntawm graphite, txo qhov nyiam ntawm cov xim dawb, thiab ua kom muaj zog.
3.2 Tus nqi ntawm inoculant ntxiv: 0.3% hauv lub hnab, 0.1% hauv pwm, 0.4% tag nrho.
Post lub sij hawm: Jun-09-2023
