在TS-2型台式扫描电子显微镜中,装入自制的微型热疲劳试验装置,观察了3Cr2W8V钢热疲劳裂纹长大过程,结果表明:热疲劳裂纹长大前,主裂纹尖端首先钝化,在其前方出现孔洞或不连续微裂纹,热疲劳裂纹的长大通过主裂纹与孔洞及微裂之间的桥接方式进行。
The growing process of thermal fatigue cracking in 3Cr2W8V steel was observed under desk SEM fitted with self-made minisized device for thermal fatigue test. Before growing of thermal fatigue crack, the main crack tip reveals to blunt firstly, and some holes and uncontinuous microcracks occur in front of it. The growth is developed by bridging of main crack together with holes and microcracks.
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