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 qauv kub hauv chav kuj txawv heev. Raws li Cu-Zn binary state diagram, muaj peb hom tooj dag nyob rau hauv chav tsev kub: tooj dag nrog zinc ntsiab lus tsawg dua 35 feem pua, lub microstructure ntawm chav tsev kub yog tsim los ntawm ib zaug xwb - theem khoom tov, hu ua tooj dag; zinc-muaj tooj dag nrog tus nqi ntawm 36 feem pua rau 46 feem pua, qhov microstructure ntawm chav tsev kub yog tsim los ntawm (ntxiv rau ) ob-theem, hu ua (ntxiv rau ) tooj dag (ob {{8}) }}phase tooj dag); cov zinc ntsiab lus tshaj 46 feem pua 50 feem pua ntawm tooj dag, microstructure ntawm chav tsev kub tsuas yog tsim los ntawm theem, uas yog hu ua tooj dag.
Kev ua haujlwm siab ua haujlwm
ib zaug-theem tooj dag (los ntawm H96 txog H65) muaj cov yas zoo thiab tuaj yeem tiv taus kev kub thiab txias, tab sis ib zaug - tooj dag yog qhov kub thiab txias brittleness thaum ua kub xws li forging, thiab nws qhov tshwj xeeb Qhov ntsuas kub sib txawv nrog cov ntsiab lus ntawm Zn. Qhov kev hloov pauv yog feem ntau ntawm 200 thiab 700 degree. Yog li, qhov kub thiab txias thaum ua haujlwm kub yuav tsum siab tshaj 700 degree. Yog vim li cas rau qhov tsim ntawm qhov nruab nrab- qhov kub thiab txias nyob rau hauv ib qho -theem - tooj dag yog vim muaj ob qho kev txiav txim sib txuas, Cu3Zn thiab Cu9Zn, hauv {{12 }}theem thaj tsam ntawm Cu-Zn alloy system, thiab kev hloov pauv tau zoo tshwm sim thaum cua sov ntawm nruab nrab thiab qis kub, ua rau cov hlau nkig; , Muaj cov kab ntawm cov hlau lead, bismuth teeb meem impurities thiab tooj liab nyob rau hauv lub alloy los ua ib tug uas tsis muaj melting point eutectic zaj duab xis faib nyob rau hauv lub grain ciam teb, uas ua rau intergranular tawg thaum lub sij hawm thermal ua. Kev xyaum qhia tau hais tias ntxiv me me ntawm cerium tuaj yeem tshem tawm cov brittleness ntawm qhov nruab nrab kub.
In the two-phase brass (from H63 to H59), in addition to the -phase with good plasticity, the -solid solution based on the electronic compound CuZn also 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 a hot state. Beta brass with a zinc content of more than 46 percent to 50 percent cannot be processed by pressure due to its hard and brittle properties.
