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。

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N. g. Earth. Investigated. Cracking. The. Earths. Crust.

国家地理。地球研究。地壳探秘。

youdao

N. g. Earth. Investigated. Cracking. The. Earths. Crust.

国家地理。地球研究。地壳探秘。

youdao