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.
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 surface layer consists of oxide, sulphide and N, C compound.
表层由氧化物、硫化物和氮（碳）化合物组成；
With the increasing of the temperature, B -C- N compound transformed from turbostratic graphite- like structure into polycrystalline crystal.
随处理温度增加，B—C—N化合物由乱层石墨结构向多晶体转变。
With the increasing of the temperature, B -C- N compound transformed from turbostratic graphite- like structure into polycrystalline crystal.
随处理温度增加，B—C—N化合物由乱层石墨结构向多晶体转变。
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