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    排气门热过载疲劳断裂失效分析

    FAILURE ANALYSIS OF EXHAUST VALVE FATIGUE FRACTURE CAUSED BY THERMAL OVERSTRESS

    • 摘要: 采用化学成分分析和宏、微观分析等方法对断裂的21-4N钢制排气门进行了分析。分析结果表明,该排气门由于过热造成其组织中析出大量层状物,进而使其力学性能降低,最终发生疲劳断裂。

       

      Abstract: The fracture of 21-4N exhaust valve was analyzed by macro examination and micro-analysis. The results showed that the fracture was related to the lamellar precipitate, which effected the valve mechanical performance the results showed that 21-4N exhaust valve fatigue fracture was caused by thermal overstress.

       

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