1. Improper quenching temperature
The quenching temperature has a very important influence on the structure of steel parts. Too low or too high a quenching temperature will lead to the presence of residual austenite in the quenched steel. The too-low quenching temperature will lead to the incomplete transformation of martensite, while the too-high quenching temperature will lead to the re-precipitation of austenite.
2. During the quenching process, the martensite that has been transformed first hinders the transformation of the untransformed austenite to martensite.

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