辉光放电光电子谱仪（GDS）渗层成分检测结果表明表面含碳量可达29.8%，合金渗层的碳含量也呈梯度分布；

GDS testing results indicate the carbon content of the surface reaches 29.8%, the carbon content in the alloyed layer emerges in gradient distribution too.

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碳氮共渗工艺选择不当，共渗层过深，表面出现壳状碳氮化合物、内氧化等缺陷组织是造成其断裂的主要原因。

The unsuitable carbonitriding process, internal oxidation, over deep depth of carbonitrided layer and crust like C N compound on the surface are the main reasons to cause fracture.

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结果表明：由渗氮试样的碳浓度分布曲线可精确确定渗氮层深。

The results show that the nitriding depth was determined accurately by the carbon concentration profiles.

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