The results show that: the whole bit wear process can be divided into three phases;
发现钻头的整个磨损过程可分为3个阶段；
The work hardening is present on the surface of audio heads during the wear process.
磁头在磨损过程中表层有冷加工硬化现象。
The work hardening is present on the surface of audio heads during the wear process.
磁头在磨损过程中表层有冷加工硬化现象。
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