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等温正火
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等温正火
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isothermal normalizing
等温正火
将钢加热到Ac3或者Accm以上30~50℃的温度,并保温一定时间,然后快速冷却到珠光体转变温度区间的某一温度,保温适当时间,使工件获得均匀的珠光体组织,最后在空气中冷却至室温的工艺。
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dual mode traveling wave tube
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dual-polarization
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