Effects of hydrogen concentration, specimen thickness and loading frequency on the hydrogen enhanced crack propagation of low alloy steel

Y. Kondo, K. Mizobe, Masanobu Kubota

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Crack propagation of SCM440H low alloy steel under varying load is enhanced by absorbed hydrogen. Substantial acceleration of crack propagation rate up to 1000 times was observed compared with that of uncharged material. The role of factors affecting enhanced acceleration was investigated by changing hydrogen concentration absorbed in metal, specimen thickness and loading frequency. Results are as follows. (1) 0.2 mass ppm diffusible hydrogen in metal was enough to cause enhanced acceleration. The predominant fracture mode showing acceleration was quasi cleavage. (2) In the case of thin specimen thinner than 0.8mm, the tri-axiality of stress is weak, and the enhanced crack propagation did not appear. However, the introduction of side-groove to 0.8mm specimen in order to increase the tri-axiality resulted in enhanced acceleration. (3) Lower loading frequency resulted in higher crack propagation rate in cycle domain. The crack propagation rate in time domain was almost constant irrespective of loading frequency. Enough concentration of hydrogen, tri-axiality and low loading frequency resulted in enhanced acceleration of fatigue crack propagation.

Original languageEnglish
Title of host publicationMaterials Structure and Micromechanics of Fracture VI
Pages519-522
Number of pages4
DOIs
Publication statusPublished - Mar 25 2011
Event6th International Conference "Materials Structure and Micromechanics of Fracture, MSMF-6" - Brno, Czech Republic
Duration: Jun 28 2010Jun 30 2010

Publication series

NameKey Engineering Materials
Volume465
ISSN (Print)1013-9826

Other

Other6th International Conference "Materials Structure and Micromechanics of Fracture, MSMF-6"
CountryCzech Republic
CityBrno
Period6/28/106/30/10

Fingerprint

High strength steel
Hydrogen
Crack propagation
Metals
Fatigue crack propagation

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Kondo, Y., Mizobe, K., & Kubota, M. (2011). Effects of hydrogen concentration, specimen thickness and loading frequency on the hydrogen enhanced crack propagation of low alloy steel. In Materials Structure and Micromechanics of Fracture VI (pp. 519-522). (Key Engineering Materials; Vol. 465). https://doi.org/10.4028/www.scientific.net/KEM.465.519

Effects of hydrogen concentration, specimen thickness and loading frequency on the hydrogen enhanced crack propagation of low alloy steel. / Kondo, Y.; Mizobe, K.; Kubota, Masanobu.

Materials Structure and Micromechanics of Fracture VI. 2011. p. 519-522 (Key Engineering Materials; Vol. 465).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Kondo, Y, Mizobe, K & Kubota, M 2011, Effects of hydrogen concentration, specimen thickness and loading frequency on the hydrogen enhanced crack propagation of low alloy steel. in Materials Structure and Micromechanics of Fracture VI. Key Engineering Materials, vol. 465, pp. 519-522, 6th International Conference "Materials Structure and Micromechanics of Fracture, MSMF-6", Brno, Czech Republic, 6/28/10. https://doi.org/10.4028/www.scientific.net/KEM.465.519
Kondo, Y. ; Mizobe, K. ; Kubota, Masanobu. / Effects of hydrogen concentration, specimen thickness and loading frequency on the hydrogen enhanced crack propagation of low alloy steel. Materials Structure and Micromechanics of Fracture VI. 2011. pp. 519-522 (Key Engineering Materials).
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