The hardness and impact toughness increase at first and then drop down with the increases of quenching temperature.

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；

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The hardness and impact toughness increase at first and then drop down with the increases of quenching temperature.

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；

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