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.
影响闪光焊接头性能的最主要因素包括焊缝区域的温度场分布、闪光顶锻的工艺参数和焊缝区域出现的缺陷组织。
The quality of the FBW joint is mainly decided by temperature field distribution, process parameters during upsetting and the structure defects.
结果表明，导柱材料化学成分超标，同时存在严重的铸造缺陷组织，增加了材料应力集中的程度，降低了材料的力学性能，从而导致导柱零件在淬火时产生开裂。
The results showed that the stress concentration is increased, the mechnical property is lowed, the chemical compositions overran and the serious cast defects is existed in the plunger.
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