名词
中文翻译：核心硬化
同义词：
['core hardening', 'core hardening treatment']
例句：
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1. The steelis undergoing core hardening to improve its strength.
钢材正在经历核心硬化以增强其强度。
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2. The process of core hardening is crucial for the durability of the material.
核心硬化过程对于材料的使用寿命至关重要。
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3.During the core hardening process, the steel is heated and then quenched quickly to achieve a hardened surface.
在核心硬化过程中，钢材被加热然后迅速淬火以获得硬化的表面。