Sample A whose surface has layer structure via oxidize-deoxidize treatment and sample B which is decarbonization are put into resistance furnace for carbonization and quencher under hydrogen.

将其中试样A通过氧化-还原处理，表面具有层状结构，与另一脱碳试样B一起放入改造后的电阻炉内在通氢气的气氛中进行渗碳淬火。

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Furthermore, it will cost too much labor and money to remove the oxidation -decarbonization-layer.

同时为去除氧化脱碳层还要耗费人力、物力。

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The existence of reticulation and mass shape ferrite, decarbonization at the screw thread surface layer which induced decline of fatigue strength of connecting bolt were also…

此外，显微组织中网状、块状铁素体的存在以及螺纹表层脱碳使连接螺栓疲劳强度下降也是造成断裂的重要原因。

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