二次回火后硬度变化不大，三次回火后，硬度反而降低。
Two times temper has little effect on the hardness, three times temper will decrease the hardness.
结果表明，随二次淬火温度的升高，硬度逐渐升高。
The results show that the higher the second quenching temperature, the higher the hardness.
研究表明，通过亚临界热处理可以使含有大量残留奥氏体的高铬铸铁产生二次硬化，从而提高高铬铸铁的硬度和耐磨性。
The Influence of the quenching and tempering treatment and the different subcritical treatment on microstrcture and property of a high alloy white cast iron was studied.
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