Fatigue Life of Helium-Implanted AISI 316L at 500 and 600 deg C
Fatigue tests of helium-implanted AISI 316L (c sub He approx 600 appm) were carried out at 500 and 600 deg C. N sub f , the number of cycles to failure, was determined for different frequencies and total strain ranges. Whereas at high frequencies He did not influence the fatigue behaviour, a drastic...
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| Published in | Journal of nuclear materials Vol. 155-157B; pp. 968 - 972 |
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| Main Authors | , |
| Format | Journal Article |
| Language | English |
| Published |
04.10.1987
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| Online Access | Get full text |
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| Summary: | Fatigue tests of helium-implanted AISI 316L (c sub He approx 600 appm) were carried out at 500 and 600 deg C. N sub f , the number of cycles to failure, was determined for different frequencies and total strain ranges. Whereas at high frequencies He did not influence the fatigue behaviour, a drastic reduction in fatigue life, a change of fracture mode from transgranular to intergranular, and a different structure of surface cracks were observed below a critical frequency nu sub c ( approx 3 Hz at 600 deg C). TEM revealed that in this case the mean bubble size in grain boundaries in implanted and fatigued specimens was larger than in those which have been implanted only. Lower temperature and MC-strengthening (JPC Alloy 8206) reduce the critical frequency and the magnitude of the drop in fatigue life. These results agree qualitatively with a model of high temperature embrittlement by Trinkaus. 12 ref.--AA |
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| Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 content type line 23 ObjectType-Feature-1 |
| ISSN: | 0022-3115 |