Defect tolerance and hydrogen susceptibility of the fatigue limit of an additively manufactured Ni-based superalloy 718

Kevinsanny, Saburo Okazaki, Osamu Takakuwa, Yuhei Ogawa, Yusuke Funakoshi, Hideto Kawashima, Saburo Matsuoka, Hisao Matsunaga

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

The sensitivity of the fatigue limit of an additively manufactured, Ni-based superalloy 718 sample to surface finishing conditions and solute hydrogen was investigated via a series of tension–compression fatigue tests. The results revealed that neither defects nor hydrogen diminished the fatigue limit of the sample. The high defect tolerance of this material is attributed to a large unit of crack initiation in the coarse grain, which eclipses the detrimental effect of AM-process-induced defects. Also, from the results, it is inferred that hydrogen has little effect on the crack propagation rate and the crack growth threshold of the material.

Original languageEnglish
Article number105740
JournalInternational Journal of Fatigue
Volume139
DOIs
Publication statusPublished - Oct 2020

All Science Journal Classification (ASJC) codes

  • Modelling and Simulation
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

Fingerprint Dive into the research topics of 'Defect tolerance and hydrogen susceptibility of the fatigue limit of an additively manufactured Ni-based superalloy 718'. Together they form a unique fingerprint.

Cite this