据我所知，热处理是人们改变金属物理性能的一种方法。
To my knowledge, heat treatment is a method by which the physical properties of metal can be changed.
热处理是将金属在固态加热和冷却以改变其物理性能的操作。
Heat treatment is the operation of heating and cooling a metal in its solid state to change its physical properties.
铸造细化金属的晶粒组织、改善其物理性能。
Forging refines the grain structure and improves physical properties of the metal.
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