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The sensitivity of surface crack initiation to surface roughness in low-cycle fatigue at high temperature |
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| Authors: | J. J. Kim and S. W. Nam J. H. Ryu |
| Affiliation: | Dept. of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, P.O. Box 150, Cheongryang, Seoul, Korea Research Institute of Industrial Science and Technology, Steel Products Dept., Hot Strip Laboratory, P.O. Box 135, Pohang, Korea |
| Abstract: | Low-cycle fatigue tests have been carried out on AISI 304L stainless steel and Cr---Mo---V steel specimens with two different modes of surface roughness at 823 K. In the case of Cr---Mo---V steel, grain boundary cavities were not formed during the test. Transgranular cracks were formed and then propagated. The number of cycles required for the crack initiation was observed to be a very large fraction of the toral fatigue life. In the case of AISI 304L stainless steel, grain boundary cavities formed and intergranular crack initiation and propagation was also observed to occur. The number of cycles required for crack initiation was negligible in comparison with the total low-cycle fatigue life. |
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