随着加工温度升高，工件表面逐渐产生回火马氏体，这是造成工件表面硬度下降的主要原因。
Tempered martensite was gradually generated as the cutting temperature increased, which is the main cause of the decrease in the hardness.
在同样晶粒度和硬度，不添加杂质的条件下，马氏体有较低的屈服强度、较高的冲击断裂功以及较低的塑脆转变温度，这些都由于较细的平均碳化物尺寸引起。
For the same grain size and hardness in the unembrittled conditions, martensite has lower yield strength higher Charpy fracture energy and lower FATT due to finer mean carbide size.
研究了低碳奥氏体— 马氏体双相不锈钢在不同回火温度下硬度变化规律。
This paper has studied hardness changing law of low carbon austenite-martensite double phases stainless steel at different tempering temperatures.
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