对驻退杆裂纹件，采用金相检验、化学分析、硬度试验、扫描电镜等手段进行综合分析。根据驻退杆装配后出现开裂这一现象，结合其生产工艺流程以及裂纹起始部位断口微观形貌特征，分析认为驻退杆的开裂原因为驻退杆的金相组织调质不良，加上夹杂物含量较多，在过盈配合时，受较大应力而开裂。
Crack in back of the pole pieces, using metallographic examination, chemical analysis, hardness testing, scanning electron microscopy and other means of comprehensive analysis. Recoil rod assembly according to cracking after this phenomenon, combined with its production process and the crack initiation site characteristics of fracture morphology, analysis of recoil Cracking shot back bar for the microstructure in quenched and bad, coupled with inclusion content more, when the interference fit, by the greater stress and cracking.
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