An in situ transmission electron microscopy study of the thermalstability of near-surface microstructures induced by deep rolling andlaser-shock peening
Journal Article
·
· Scripta Materialia
Mechanical surface treatments are known to be effective at improving the fatigue resistance of metallic alloys at elevated temperatures ({approx}550-600 C), even though the near-surface compressive residual stress fields have been annealed out. We have investigated the thermal stability of near-surface microstructures induced by deep rolling and laser-shock peening in an austentic stainless steel (AISI 304) and a titanium alloy (Ti-6Al-4V) using in situ hot-stage transmission electron microscopy. It is found that the improvements in fatigue resistance at elevated temperature are related to the high-temperature stability of the work-hardened near-surface microstructure in each case.
- Research Organization:
- COLLABORATION - U. ofKassel/Germany
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- DE-AC02-05CH11231
- OSTI ID:
- 892210
- Report Number(s):
- LBNL-53335; SCMAF7; R&D Project: 511906; BnR: KC0201020; TRN: US200622%%783
- Journal Information:
- Scripta Materialia, Vol. 48; Related Information: Journal Publication Date: 2003; ISSN 1359-6462
- Country of Publication:
- United States
- Language:
- English
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