Microstructure refinement by metallic particle impact

Vincent Lemiale, Yuri Estrin, Robert O'donnell, Hyoung Seop Kim

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Abstract

Grain refinement by plastic deformation is becoming increasingly popular as a way of producing metals with improved properties, such as higher mechanical strength. Surface treatment techniques in which a metallic substrate is bombarded with metallic particles can generate nanocrystalline layers in the impact zone. Understanding the physical mechanisms behind this grain refinement is crucial to achieve an improvement of existing experimental processes. In this paper, we propose a numerical framework combining finite element simulations with a dislocation-based material model to predict the evolution of the microstructure under particle impact. A single particle impacting a metallic substrate along its normal was simulated for different initial velocities. The simulations were compared with previously reported numerical and experimental data. The results indicate that our model accurately captures the grain refinement in the impact zone for a broad range of velocities. This approach provides valuable information on the formation of nanocrystalline layers in both the substrate and the impacting particle. It has potential applications in any process involving surface treatment by high-velocity particles, such as shot peening, surface mechanical attrition treatment, kinetic metallization, cold spray, etc.

Original languageEnglish
Title of host publication65th ABM International Congress, 18th IFHTSE Congress and 1st TMS/ABM International Materials Congress 2010
Pages5173-5183
Number of pages11
Volume6
Publication statusPublished - 2010
Event65th ABM International Congress, 18th IFHTSE Congress and 1st TMS/ABM International Materials Congress 2010 - Rio de Janeiro, Brazil
Duration: 26 Jul 201030 Jul 2010

Conference

Conference65th ABM International Congress, 18th IFHTSE Congress and 1st TMS/ABM International Materials Congress 2010
CountryBrazil
CityRio de Janeiro
Period26/07/1030/07/10

Keywords

  • Copper
  • Finite element simulations
  • Grain refinement
  • Particle impact

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