热处理后，材料的硬度和强度均有提高，但冲击韧度下降。

Through heat treatment, material hardness and strength increase, but impact toughness decreases.

youdao

热处理后，材料的硬度和强度均有提高，但冲击韧度下降。

Through heat treatment, material hardness and strength increase, but impact toughness decreases.

youdao