Plenty of oxidation etching pits are found on the surface of the specimen after the thermal fatigue test, and the surface principal crack is prone to propagate through these etching pits.
实验结果发现，试样表面出现大量的氧化腐蚀坑，表面主裂纹优先通过这些腐蚀坑扩展。
By means of chemical composition analysis, mechanical property test and microstructure examination, the results showed that this defect was result of rough surface and not the crack existed in matrix.
采用化学分析、力学性能试验和金相检验等方法对该裂纹进行了分析。结果表明，此缺陷是由于试验环原始表面的粗糙度过大造成的。
The treatment technology of "chrome-automatic painting" on the surface of the corroded specimens will make crack more clear to be observed and recorded in the test.
本文采用对锈蚀后试件表面进行“镀铬色自动喷漆”的处理在试验过程中可以使裂纹更加清晰的观察记录；
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