Numerical evaluation of energy transfer during surface mechanical attrition treatment

Xiaochun Zhang, Jian Lu, San-Qiang Shi

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

1 Citation (Scopus)

Abstract

Experiments showed that Surface Mechanical Attrition Treatment (SMAT) is one of the most effective ways to optimize the surface structure of metals and alloys, and therefore to enhance the global behaviors of a material and its service lifetime. However, there is still a lack of clear relationships between desired surface structures/properties and controlling parameters in SMAT process. The relationship between impact ball parameters and the indent coverage on a sample surface has been obtained from the previous work by coupling a global random impact model and a local impact frequency model. In this work, a more realistic SMAT model is built according to the previous investigation. The cyclic deformation process during SMAT always leads to change in the temperature of deformed material. Thus, the thermodynamic framework of the mechanical constitutive model allows the partition of the plastic work into the dissipated energy (usually, dissipated as heat) and the energy stored in the material due to increasing the grain boundary area (grain refinement) and introducing dislocations. The computational model of random flying balls with three different ranges of oblique angle is defined and the components of impinging and rebounding velocity during SMAT are monitored in this study. The stored energy and the fraction of plastic work converted into heat (β) are numerically evaluated.
Original languageEnglish
Title of host publicationProceedings of the 1st World Congress on Integrated Computational Materials Engineering, ICME
Pages63-68
Number of pages6
Publication statusPublished - 19 Aug 2011
Event1st World Congress on Integrated Computational Materials Engineering, ICME - Seven Springs, PA, United States
Duration: 10 Jul 201114 Jul 2011

Conference

Conference1st World Congress on Integrated Computational Materials Engineering, ICME
CountryUnited States
CitySeven Springs, PA
Period10/07/1114/07/11

Keywords

  • Dissipated energy
  • Random impact
  • Stored energy
  • Surface mechanical attrition treatment

ASJC Scopus subject areas

  • Materials Science (miscellaneous)

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