分析包括结构强度分析、宏观断口分析、金相分析和扫描电镜分析等。

The failure analysis consisted of a strength analysis, a macro-fracture surface analysis, a metallurgical microscope and scanning electron microscope analysis.

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通过受力分析、宏观断口分析和微观分析表明，零件的设计和化学成分符合要求；

Through mechanic analysis, macrofractgraphic analysis and microscopic analysis, it shows that the design of the component and chemical composition meet the requirements.

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采用宏观断口分析、化学成分分析及金相检验等方法，对发动机排气门杆断裂原因进行了分析。

By means of macroscopic analysis, chemical composition analysis and microstructure examination, the cracking reason of engine exhaust valve stem has been studied.

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