4.7 Article

Crack appearance of a laser shock-treated single crystal nickel-base superalloy after isothermal fatigue failure

Journal

SURFACE & COATINGS TECHNOLOGY
Volume 321, Issue -, Pages 74-80

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2017.04.044

Keywords

Nickel-base superalloys; Laser shock processing (ISP); Fatigue; Fracture

Funding

  1. High Technology Research and Development Program of China [2014AA041701]
  2. National Natural Science Foundation of China [51171179, 51271174, 51331005, 51501219, 11332010]
  3. Natural Science Foundation of Liaoning Province in China [2015020115]

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Isothermal fatigue testing was conducted on single crystal nickel-base superalloys. Distinct cracking behaviors were found to occur in the specimens treated by different laser shock processing (ISP) technologies. A crack generally initiates from the casting micropore. For the well surface strengthened specimens suffered high laser shock intensities, the crack initially grows along one or more of the {111} planes and falls on the edge of the cylindrical specimen. For the poorly strengthened specimens, the final fracture area is usually located inside. (C) 2017 Elsevier B.V. All rights reserved.

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