结果表明，锻环圆锭毛坯中存在夹杂是导致LC9锻环内裂的原因。
The results show that the cause of interior cracks of LC9 forged ring is due to inclusions existed in the billet of forged ring.
研究了粉末热锻浮动油封密封环的材质、表面处理、显微组织对其耐磨性的影响。
The effects of material composition, working surface treatment and microstructure on wear resistance of powder hot-forging flow oil-seal ring were studied.
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