针对公司某型柴油机气门在主机厂台架实验时出现锥面、盘部掉块问题,从宏观和微观形貌、组织进行了检测,对其失效原因进行了全面分析。 Aiming at a certain type of diesel engine valve in the main engine factory bench experiment, the conical surface and the disc area were discarded. The macroscopic and microscopic appearances and microstructures were tested, and the causes of failure were analyzed comprehensively.