Chav tsev kub cov ntaub so ntswg
Ordinary tooj dag yog tooj liab-zinc binary alloy, thiab nws cov ntsiab lus zinc sib txawv, yog li nws cov microstructure ntawm chav tsev kub kuj txawv heev. Raws li Cu-Zn binary xeev daim duab (daim duab 6), muaj peb hom microstructure ntawm tooj dag nyob rau hauv chav tsev kub: tooj dag nrog zinc cov ntsiab lus hauv qab no 35 feem pua , thiab cov microstructure ntawm chav tsev kub yog tsim los ntawm ib tug { {4}}phase solid tov, uas yog hu ua tooj dag; Lub microstructure ntawm tooj dag nrog zinc cov ntsiab lus nyob rau hauv thaj tsam ntawm 36 feem pua 46 feem pua ntawm chav tsev kub yog tsim los ntawm (ntxiv rau ) ob theem, uas yog hu ua (ntxiv rau) tooj dag (ob -theem tooj dag); tooj dag muaj ntau tshaj 46 feem pua 50 feem pua zinc, uas nws microstructure ntawm chav tsev kub tsuas yog tsim los ntawm theem, hu ua tooj dag.
Xovxwm processability
-ib zaug- tooj dag (los ntawm H96 txog H65) muaj cov yas zoo thiab tuaj yeem tiv taus txias thiab kub ua haujlwm. Txawm li cas los xij, -ib zaug- theem tooj dag zoo li nkig ntawm qhov nruab nrab kub thaum ua haujlwm kub xws li forging, thiab nws qhov tshwj xeeb kub txawv txawv nrog Zn ntsiab lus, feem ntau ntawm 200 degree thiab 700 degree . Yog li, qhov kub thiab txias thaum ua haujlwm kub yuav tsum siab tshaj 700 degree. Qhov laj thawj tseem ceeb rau thaj tsam ntawm ib qho -theem tooj dag ntawm qhov nruab nrab kub yog tias muaj ob qhov sib txuas, Cu3Zn thiab Cu9Zn, nyob rau hauv theem cheeb tsam ntawm Cu-Zn alloy system, uas raug txiav txim hloov pauv. thaum rhuab ntawm nruab nrab thiab qis kub, ua rau cov alloy brittle. Tsis tas li ntawd, muaj ob peb teeb meem impurities ntawm txhuas thiab bismuth nyob rau hauv cov hlau, uas tsim ib tug eutectic zaj duab xis uas tsis muaj melting point thiab faib nyob rau hauv lub grain ciam teb, ua rau intergranular puas thaum lub sij hawm ua hauj lwm kub. Kev xyaum qhia tau hais tias ntxiv trace cerium tuaj yeem tshem tawm cov brittleness ntawm nruab nrab kub.
In two-phase brass (from H63 to H59), besides phase with good plasticity, solid solution based on electronic compound CuZn appears in the alloy structure. The phase has high plasticity at high temperature, while the ' phase (ordered solid solution) at low temperature is hard and brittle. Therefore, ( plus ) brass should be forged in hot state. brass with zinc content greater than 46 percent 50 percent can't be pressed because of its hard and brittle properties.
