Piv nrog rau castings, hlau raug rau cov txheej txheem forging nthuav qhia kev txhim kho microstructure thiab txhua yam khoom. Thaum cov qauv cam khwb cia kub ua haujlwm deformation los ntawm forging-tsav los ntawm cov hlau deformation thiab recrystallization- nws cov thawj coarse dendrites thiab columnar nplej tau hloov mus rau hauv ib qho zoo-grained, equiaxed, thiab uniformly loj recrystallized qauv. Cov txheej txheem no compresses thiab welds kaw ua ntej-cov teeb meem uas twb muaj lawm nyob rau hauv lub ingot-xws li kev sib cais, porosity, gas voids, thiab slag inclusions-ua rau ib tug denser microstructure thiab txhim khu hlau plasticity thiab mechanical kev ua tau zoo.
Cov cuab yeej cuab tam ntawm castings feem ntau tsis zoo rau cov forgings ua los ntawm tib cov khoom. Tsis tas li ntawd, forging ua kom qhov txuas ntxiv ntawm cov hlau fiber ntau, ua kom cov nplej ntws nrog rau sab nraud ntawm lub workpiece. Qhov kev txuag ntawm cov hlau ntws cov kab no lav tias cov khoom muaj cov khoom siv zoo heev thiab lub neej ua haujlwm ntev. Forgings uas tsim los ntawm cov txheej txheem siab heev-xws li precision tuag forging, txias extrusion, los yog sov extrusion- muaj peev xwm ua tau zoo uas yooj yim incomparable rau cov castings.
Lub forging yog ib yam khoom tsim los ntawm kev siv lub siab rau cov hlau los ntxias cov yas deformation, yog li shaping nws mus rau hauv ib daim ntawv xav tau los yog ua rau nws tsim nyog compressive rog. Lub zog no feem ntau yog siv rauj los yog xovxwm. Cov txheej txheem forging tsim cov qauv ua kom zoo zoo thiab ua kom cov hlau zoo dua qub. Nyob rau hauv kev siv tswv yim, ib tug zoo tsim forging xyuas kom meej tias cov nplej txaus yog oriented nyob rau hauv kev sib raug zoo nrog rau cov kev taw qhia ntawm cov thawj kev nyuaj siab loads. Ib qho casting, conversely, yog cov khoom hlau tsim los ntawm ntau txoj kev casting; tshwj xeeb, nws suav nrog kev nchuav -los yog txhaj ntawm lub siab, nqus, lossis lwm yam txuj ci-molten hlau rau hauv lub pre-npaj pwm. Tom qab txias, cov khoom siv tau cov txheej txheem xws li tshem tawm pwm, ntxuav, thiab tom qab- kho kom ua tiav cov khoom tiav nrog cov duab tshwj xeeb, qhov ntev, thiab cov khoom tsim.
