Role of cavities on deformation-induced martensitic transformation pathways in a laser-welded, neutron irradiated austenitic stainless steel

Keyou S. Mao, Cheng Sun, Ching Heng Shiau, Kayla H. Yano, Paula D. Freyer, Anter A. El-Azab, Frank A. Garner, Aaron French, Lin Shao, Janelle P. Wharry

Research output: Contribution to journalArticlepeer-review

Abstract

The role of cavities on deformation-induced martensitic phase transformations is studied in a laser-welded and neutron irradiated austenitic stainless steel. Orientation dependent nanoindentation experiments are performed in the base metal and the weld heat affected zone (HAZ) at room temperature. Transmission electron microscopy study of deformed microstructures indicates indentation-induced α’-martensite forms in the base metal, whereas α’- and ε-martensite arise in the HAZ. The different pathway of martensite phase transformation is attributed to the laser weld-induced annealing of cavities. Our results suggest that deformation-induced martensitic phase transformation of austenitic stainless steel is correlated to neutron irradiated cavity structures.

Original languageEnglish (US)
Pages (from-to)1-6
Number of pages6
JournalScripta Materialia
Volume178
DOIs
StatePublished - Mar 15 2020
Externally publishedYes

Keywords

  • Austenitic stainless steel
  • Cavity
  • Laser weld
  • Martensitic transformation
  • Nanoindentation

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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