Effect of Laser Shock Peening on the Microstructures and Properties of Oxide-Dispersion-Strengthened Austenitic Steels

Xueliang Yan, Fei Wang, Leimin Deng, Chenfei Zhang, Yongfeng Lu, Michael Nastasi, Marquis A. Kirk, Meimei Li, Bai Cui

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Oxide-dispersion-strengthened (ODS) austenitic steels are promising materials for next-generation fossil and nuclear energy systems. In this study, laser shock peening (LSP) has been applied to ODS 304 austenitic steels, during which a high density of dislocations, stacking faults, and deformation twins are generated in the near surface of the material due to the interaction of laser-driven shock waves and the austenitic steel matrix. The dispersion particles impede the propagation of dislocations. The compressive residual stress generated by LSP increases with successive LSP scans and decreases along the depth, with a maximum value of −369 MPa. The hardness on the surface can be improved by 12% using LSP. In situ transmission electron microscopy (TEM) irradiation studies reveal that dislocations and incoherent twin boundaries induced by LSP serve as effective sinks to annihilate irradiation defects. These findings suggest that LSP can improve the mechanical properties and irradiation resistance of ODS austenitic steels in nuclear reactor environments.

Original languageEnglish (US)
Article number1700641
JournalAdvanced Engineering Materials
Volume20
Issue number3
DOIs
StatePublished - Mar 2018

Keywords

  • ODS austenitic steels
  • irradiation resistance
  • laser shock peening
  • microstructure
  • residual stress

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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