The reason of arc crack on retarder gear surface was analyzed by means of chemical composition analysis, hardness testing, macrostructure and microstructure examination.
通过化学成分分析、硬度试验、宏观和微观检验等方法，对减速机齿轮齿面弧形裂纹的产生原因进行了分析。
2
Surface stabilization of metal powders were processed with some oxidation - retarder. oxidation retardation mechanism was discussed in this paper.