再结晶退火
再结晶退火是把冷却变形后的金属加热到再结晶温度以上保持适当时间,使变形晶粒重新转变为均匀等轴晶粒而消除加工硬化的热处理工艺。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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