Differences between internal and external hydrogen effects on slow strain rate tensile test of iron-based superalloy A286

Research output: Contribution to journalArticlepeer-review

Abstract

To investigate the evaluation method of hydrogen compatibility of A286 superalloy in high pressure hydrogen gas, SSRT tests of hydrogen-charged specimens were conducted at ambient temperature at various strain rates. The relative reduction in area (RRA), one of the ductility parameters, was determined. The hydrogen content in the hydrogen-charged specimen was the same as the equilibrium hydrogen content on the specimen surface at 150 °C in 70 MPa hydrogen gas. The strain rate dependence of RRA was smaller than that of RRA obtained in 70 MPa hydrogen gas at 150 °C. All the hydrogen-charged specimens showed slip-plane fractures in the grains in their cores. However, the specimens in 70 MPa hydrogen gas at 150 °C showed fracture surfaces morphology ranging from dimples to quasi-cleavages and intergranular fractures with decreasing strain rate. These dissimilarities are expected to arise from differences in the hydrogen concentration behaviors of the specimens during the deformation process.

Original languageEnglish
Pages (from-to)2723-2734
Number of pages12
JournalInternational Journal of Hydrogen Energy
Volume47
Issue number4
DOIs
Publication statusPublished - 2022 Jan 12

Keywords

  • A286
  • Fracture surface
  • Hydrogen embrittlement
  • Relative reduction in area
  • Slow strain rate tensile test
  • SUH660

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

Fingerprint

Dive into the research topics of 'Differences between internal and external hydrogen effects on slow strain rate tensile test of iron-based superalloy A286'. Together they form a unique fingerprint.

Cite this