An investigation on microstructure and mechanical property of thermally aged stainless steel weld overlay cladding

X. Y. Cao, P. Zhu, X. F. Ding, Y. H. Lu, Tetsuo Shoji

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Microstructural evolution and mechanical property change of E308L stainless steel weld overlay cladding aged at 400 °C for 400, 1000 and 5000 h were investigated by transmission electron microscope (TEM) and small punch test (SPT). The results indicated that thermal aging had no obvious effect on the volume fraction of ferrite, but can cause microstructural evolution by spinodal decomposotion and G-phase precipitation in the ferrite phase. Spinodal decomposition took place after aging up to 1000 h, while G-phase formed along dislocations, and growed up to 2–11 nm after aging for 5000 h. The total energy for inducing deformation and fracture by the small punch tests decreased with the increase of thermal aging time, and this decline was associated with spinodal decomposition and G-phase precipitation. Plastic deformation of the aged ferrite proceeded via formation of curvilinear slip bands. Nucleation of microcracks occurred at the δ/γ interface along the slip bands. The hardening of the ferrite and high stress concentration on δ/γ phase interface resulted in brittle fracture and phase boundary separation after thermal aging.

Original languageEnglish
Pages (from-to)172-182
Number of pages11
JournalJournal of Nuclear Materials
Volume486
DOIs
Publication statusPublished - 2017 Apr 1

Keywords

  • Mechanical properties
  • Microstructure
  • Thermal aging
  • Weld overlay cladding

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Materials Science(all)

Fingerprint Dive into the research topics of 'An investigation on microstructure and mechanical property of thermally aged stainless steel weld overlay cladding'. Together they form a unique fingerprint.

Cite this