The main factor influencing the tensile properties of surface nano-crystallized graded materials

Jianjun Li, Shaohua Chen*, Xiaolei Wu, Aikah Soh, Jian Lu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)

Abstract

The improved mechanical properties of surface nano-crystallized graded materials produced by surface severe plastic deformation (S2PD) are generally owing to the effects of the refined structure, work-hardened region and compressive residual stress. However, during the S2PD process, residual stress is produced simultaneously with work-hardened region, the individual contribution of these two factors to the improved mechanical properties remains unclear. Numerical simulations are carried out in order to answer this question. It is found that work hardening predominates in improving the yield strength and the ultimate tensile strength of the surface nano-crystallized graded materials, while the influence of the residual stress mainly emerges at the initial stage of deformation and decreases the apparent elastic modulus of the surface nano-crystallized graded materials, which agrees well with the experimental results.

Original languageEnglish
Pages (from-to)7040-7044
Number of pages5
JournalMaterials Science and Engineering: A
Volume527
Issue number26
DOIs
Publication statusPublished - Oct 2010
Externally publishedYes

Keywords

  • Finite element method
  • Residual stress
  • Surface nano-crystallized graded material
  • Work hardening

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Li, J., Chen, S., Wu, X., Soh, A., & Lu, J. (2010). The main factor influencing the tensile properties of surface nano-crystallized graded materials. Materials Science and Engineering: A, 527(26), 7040-7044. https://doi.org/10.1016/j.msea.2010.07.064