Analysis of the Stem-fillet blend fracture of exhaust valve was conducted by means of macroexamination, microstructure examination, chemical composition analysis and hardness test.

摘用宏、微观检验、分分析和硬度测试等方法对断头的排气门进行了分析。

Research on the failure reasons of the cooling tube were carried out by means of macroexamination, thickness measurement, X ray diffraction, optical microscopy and chemical analysis.

用宏、微观分析、分分析等手段,对冷却水管的腐蚀穿孔进行了失效分析。