Investigation of Laser Peening Effects on Hydrogen Charged Stainless Steels

Thesis/Dissertation · Thu Oct 30 04:00:00 EDT 2008

DOI:https://doi.org/10.2172/965957· OSTI ID:965957

Zaleski, Tania M. ^[1]

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1. San Jose State Univ., CA (United States)

Hydrogen-rich environments such as fuel cell reactors can exhibit damage caused by hydrogen permeation in the form of corrosion cracking by lowering tensile strength and decreasing material ductility. Coatings and liners have been investigated, but there were few shot-peening or laser peening studies referenced in the literature with respect to preventing hydrogen embrittlement. The surface compressive residual stress induced by laser peening had shown success in preventing stress corrosion cracking (SCC) for stainless steels in power plants. The question arose if the residual stresses induced by laser peening could delay the effects of hydrogen in a material. This study investigated the effect of laser peening on hydrogen penetration into metal alloys. Three areas were studied: laser peening, hydrogenation, and hydrogen detection. This study demonstrated that laser peening does not reduce the hydrogen permeation into a stainless steel surface nor does it prevent hydrogen embrittlement. The effect of laser peening to reduce hydrogen-assisted fatigue was unclear.

• Research Organization: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 965957
• Report Number(s): LLNL-TH--408305
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
36 MATERIALS SCIENCE
ALLOYS
COATINGS
CORROSION
DETECTION
DUCTILITY
FUEL CELLS
HYDROGEN
HYDROGEN EMBRITTLEMENT
HYDROGENATION
LASERS
LINERS
POWER PLANTS
RESIDUAL STRESSES
SHOT PEENING
STAINLESS STEELS
STRESS CORROSION
TENSILE PROPERTIES