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Plasma nitriding of gradient structured AISI 304 at low temperature: Shot peening as a catalyst treatment

Unal, O ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1016/j.vacuum.2019.03.027
  3. Publisher: Elsevier Ltd , 2019
  4. Abstract:
  5. This study involves the capability of severe shot peening (SSP) as a catalyst intake for plasma nitriding process and the probability of reducing the requirement of thermal energy individually on the diffusion of interstitial atoms. To this end, combination of mechanical-thermal energy is run with pure thermal plasma assisted energy. Therefore, SSP is exposed to AISI 304 austenitic stainless steel as a former treatment and gradient structured surface (nanograined zone, ultrafine grain martensite-twin intersections zone and twin densed zone) is created. Then, plasma nitriding at 400 0 C-4h and 475 0 C-2h temperature-duration conditions. The condition of 475 0 C-2h provides the requirements of diffusion individually however former treatment SSP increases the diffusion layer effectively. In contrast, 400 0 C-4h condition is not adequate for diffusing atoms and white layer formation on the surface. The support of SSP as a mechanical energy triggers the process and white layer and the interstitial atoms diffusion take place influentially
  6. Keywords:
  7. Diffusion layer ; Plasma nitriding ; Severe shot peening ; Aluminum nitride ; Atoms ; Austenitic stainless steel ; Catalysts ; Diffusion ; Nitriding ; Nitrogen plasma ; Shot peening ; Temperature ; Thermal energy ; Catalyst treatments ; Diffusion layers ; Interstitial atoms ; Low temperatures ; Mechanical energies ; Structured surfaces ; Twin intersection ; Plasma applications
  8. Source: Vacuum ; Volume 164 , 2019 , Pages 194-197 ; 0042207X (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0042207X19303707