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.
| Original language | English |
|---|---|
| Pages (from-to) | 335-342 |
| Number of pages | 8 |
| Journal | Materials Science and Engineering A |
| Volume | 739 |
| DOIs | |
| Publication status | Published - Jan 2 2019 |
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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 journal › Article
}
TY - JOUR
T1 - Hydrogen-induced ductility loss of precipitation-strengthened Fe-Ni-Cr-based superalloy
AU - Takakuwa, Osamu
AU - Ogawa, Yuhei
AU - Yamabe, Junichiro
AU - Matsunaga, Hisao
PY - 2019/1/2
Y1 - 2019/1/2
N2 - 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.
AB - 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.
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UR - http://www.scopus.com/inward/citedby.url?scp=85055088965&partnerID=8YFLogxK
U2 - 10.1016/j.msea.2018.10.040
DO - 10.1016/j.msea.2018.10.040
M3 - Article
VL - 739
SP - 335
EP - 342
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
SN - 0921-5093
ER -