随奥氏体化温度的升高，实验钢的硬度和冲击韧度先升高后降低；
The hardness and impact toughness increase at first and then drop down with the increases of quenching temperature.
调整微合金含量和种类，可增加钢中碳化物数量、种类和弥散度，从而提高钢的硬度和冲击韧度。
The amount, kind and dispersity of carbide in steel can increase by regulating the content and kind of microalloying elements. So its hardness and impact toughness can be increased.
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.
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