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Room temperature tissue
Ordinary brass is a copper-zinc binary alloy, and its zinc content varies widely, so its room temperature structure is also very different. According to the binary state diagram of Cu-Zn (Fig. 6), there are three kinds of room temperature microstructure of brass: brass with a zinc content of less than 35%. The microstructure at room temperature consists of a single-phase α solid solution called α yellow. Copper; brass with a zinc content ranging from 36% to 46%. The microstructure at room temperature consists of two phases (α+β), called (α+β) brass (two-phase brass); For brass with a zinc content of more than 46% to 50%, the microstructure at room temperature consists only of the beta phase, called beta brass.
Press processing performance
α single-phase brass (from H96 to H65) has good plasticity and can withstand hot and cold processing, but α-phase brass is prone to moderate temperature brittleness during hot working such as forging, and its specific temperature range varies with the amount of Zn. The change is generally between 200 and 700 °C. Therefore, the temperature during hot working should be higher than 700 °C. The reason why the medium-temperature α-brass medium-temperature brittle zone is mainly caused by the presence of two ordered compounds of Cu3Zn and Cu9Zn in the α-phase region of the Cu-Zn alloy system, which undergoes orderly transformation during medium-low temperature heating, making the alloy brittle; There is a trace amount of lead, antimony harmful impurities and copper forming a low-melting eutectic film distributed on the grain boundary in the alloy, and intergranular cracking occurs during hot working. Practice has shown that the addition of trace amounts of strontium can effectively eliminate moderate temperature brittleness.