Hydrogen-induced ductility loss of precipitation-strengthened Fe-Ni-Cr-based superalloy

Osamu Takakuwa, Yuhei Ogawa, Junichiro Yamabe, Hisao Matsunaga

Research output: Contribution to journalArticle

Abstract

A brittle-like faceted morphology of a precipitation-strengthened Fe-Ni-Cr-based superalloy after charging via exposure to high-pressure hydrogen gas (100 MPa) at elevated temperature (543 K) was interpreted based on multiple electron microscopy observations: scanning electron microscopy (SEM), electron backscatter diffraction (EBSD) and electron channeling contrast (ECC) imaging. The observation results revealed that the brittle-like facets were derived from intergranular cracking accompanied by hydrogen-assisted microvoid nucleation at the grain boundaries (GBs). Deformation twinning also played a crucial role in triggering the final grain boundary separation due to local stress concentration at its intersection with the GBs after severe strain hardening; such a process has not yet been considered to explain the hydrogen-induced ductility loss of this type of alloy.

LanguageEnglish
Pages335-342
Number of pages8
JournalMaterials Science and Engineering A
Volume739
DOIs
Publication statusPublished - Jan 2 2019

Fingerprint

heat resistant alloys
ductility
Superalloys
Ductility
Hydrogen
Grain boundaries
grain boundaries
hydrogen
stress concentration
strain hardening
Twinning
twinning
Strain hardening
Electron diffraction
intersections
Electron microscopy
charging
Stress concentration
flat surfaces
electron microscopy

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Hydrogen-induced ductility loss of precipitation-strengthened Fe-Ni-Cr-based superalloy. / Takakuwa, Osamu; Ogawa, Yuhei; Yamabe, Junichiro; Matsunaga, Hisao.

In: Materials Science and Engineering A, Vol. 739, 02.01.2019, p. 335-342.

Research output: Contribution to journalArticle

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