recently, I investigated the damaged blade surface for gas turbine component.
According to the fractography analysis, the striation and beach marks have been observed.
How can I realize that this surface is related to the LCF or HCF?
Generally, Is there any logical approach to find out the LCF or HCF fatigue from the fractured surface?
according to my knowledge, the appearance of the secondary cracks or presence of the striation spacing is related to the HCF fatigue while fissures cracks are promoted in LCF.
the studied material is: IN 738
all the dada has been gathered from farctography using SEM
Is is required to use STEM or TEM (from beneath of fractured surface) for detecting LCF of HCF?
regards
It seems to be the final phase. In the starting phase, the fracture follows the slip planes, resulting in a cleavage character.
Martin Möser
Thanks Dear Moser
Yes, you are right. This image is belonging to the final stage of fatigue crack propogation. According to your comment. Is it true to say that
In low cycle fatigue we observe quasi cleavage palnes while for High cycle fatigue the group of striations is promoted in fracture area ?
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