结果表明材料选择错误、淬火温度不当，以及中频淬火区域过小是导致传动轴断裂的原因。
The results indicate that the mistake choice of material, unreasonable quench temperature and too small region of MF quenching are the cause of transmission shaft fracture.
结果表明，奥氏体的再结晶发生在钢的正常淬火温度以上的一个温度范围，并在该范围内存在晶粒细化效果最佳的温度区域；
The results showed that the austenite recrystallization occurs in a temperature range biger than thenormal quenching temperature and there is an optimum temperature range for the grain refining.
等离子表面淬火硬化层的硬度分布，在某一区域内无明显的硬度梯度，这与常规淬火方法的结果不太一样。
The hardness distribution without obviously declining gradient in one range of the hardened layer produced by plasma quenching is rather different from that by conventional quenching.
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