An in situ transmission electron microscopy study of the thermalstability of near-surface microstructures induced by deep rolling andlaser-shock peening

Journal Article · Mon Feb 24 04:00:00 EST 2003 · Scripta Materialia

DOI:https://doi.org/10.1016/S1359-6462(03)00143-X· OSTI ID:892210

Altenberger, I; Stach, E A; Liu, G Y; Nalla, R K; Ritchie, R O

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: AC02-05CH11231
• OSTI ID: 892210
• Report Number(s): LBNL--53335; BnR: KC0201020
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Vol. 48; ISSN 1359-6462; ISSN SCMAF7
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALLOYS
MICROSTRUCTURE
ROLLING
SHOT PEENING
STABILITY
STAINLESS STEELS
SURFACE TREATMENTS
TITANIUM ALLOYS
TRANSMISSION ELECTRON MICROSCOPY
Ti-6Al-4V AISI 304 fatigue surface treatment deep rollinglaser-shock peening