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Surface Integrity and Oxidation of a Powder Metallurgy Ni-Based Superalloy Treated by Laser Shock Peening

Journal Article · · JOM. Journal of the Minerals, Metals & Materials Society
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  1. Univ. of Science and Technology, Beijing (China)
  2. Beijing Inst. of Aeornautical Materials (China)
  3. Air Force Engineering Univ., Xi'an (China)
  4. Argonne National Lab. (ANL), Argonne, IL (United States)

Laser shock peening is a mechanical surface treatment which can induce large compressive residual stresses and microstructural changes in the material by using repetitive shocks from laser pulses. In this work, the surface integrity (surface microstructure, topography, hardness and residual stress) of a laser shock peening treated powder metallurgy Ni-based superalloy was investigated. Laser shock peening treatment introduces large plastic deformation especially at a depth of about 100 μm from the surface, which increases the local hardness. The residual stress from the surface to the interior of the sample was investigated by synchrotron X-ray diffraction. The maximum compressive stress reaches 400 MPa at the surface, while the depth of the compressive stress is about 0.7 mm. Lastly, the oxidation behavior of the treated and untreated samples was evaluated by thermal exposure at 700°C for 312 h. The LSP treatment decreased the thickness of oxide layer, thereby showing improved oxidation resistance.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Key Research and Development Program of China; National Natural Science Foundation of China (NSFC); Fundamental Research Funds for the Central Universities; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1668069
Journal Information:
JOM. Journal of the Minerals, Metals & Materials Society, Journal Name: JOM. Journal of the Minerals, Metals & Materials Society Journal Issue: 5 Vol. 72; ISSN 1047-4838
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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