Localized plastic deformation and hardening in laser shock peened Inconel alloy 718SPF
- Department of Mechanical Engineering and Material Science, University of Cincinnati, Cincinnati, OH 45221-0072 (United States)
- Department of Mechanical Engineering, University of Akron, Akron, OH 44325-3903 (United States)
- Department of Mechanical Engineering, University of Texas at Dallas, Richardson, TX 75080-3021 (United States)
Highlights: • The plastic strain in LSP-treated Inconel 718 alloy was characterized using EBSD. • LSP increases the low angle misorientations in the near-surface region, indicating the extend of plastic strain. • The near-surface plastic strain leads to an increase in local hardness and yield stress. - Abstract: Localized plastic deformation and hardening was studied in laser shock peened (LSP) Inconel 718 SPF (Super plastic forming), a fine grained Ni-Base superalloy, using electron backscatter diffraction (EBSD), nanoindentation, and micro pillar compression testing. 718SPF samples were LSP-treated with two different laser power densities. After LSP, the plastic deformation is manifested as increase in the fraction of low angle misorientations and the formation of sub-grain boundaries. EBSD was used to study plastic deformation as a function of distance from the peened surface for different laser intensities. Different approaches like image quality mapping and local misorientations analysis were used to study the in-depth distribution of the plastic strain. Results show that EBSD is effective in the qualitative characterization of localized plastic strain of the materials subjected to LSP.
- OSTI ID:
- 22832985
- Journal Information:
- Materials Characterization, Journal Name: Materials Characterization Vol. 142; ISSN 1044-5803; ISSN MACHEX
- Country of Publication:
- United States
- Language:
- English
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