名词
中文翻译：火焰硬化
同义词：
['fire hardening', 'flame hardening']
例句：
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1.The metal was subjected to flame hardening to improve its strength.
金属经过火焰硬化以提高其强度。
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2. The process of flame hardening is crucial for the production of high-quality steel.
火焰硬化过程对于生产高质量钢材至关重要。
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3.During flame hardening, the material undergoes a significant change in its physical properties.
在火焰硬化过程中，材料会经历显著的物理性质变化。