钎焊焊缝的枝晶间显微疏松导致的应力集中与微裂纹效应以及近焊缝区母材晶粒长大是导管早期疲劳开裂的主要原因。
The results show that the crack initiates at the outer surface of the weld comer and propagates into the steel base material with a high cycle fatigue mode.
形貌分析结果表明，因H、O原子等逸出及微晶间部分碳原子被烧损，PANACF的表面形成了极丰富的微孔。
The results show that the release of H and O atom and the burning of part carbon atoms in microcrystal, results in formation of the enrich micropores at the surface of PANACF.
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