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

Yoshiyuki Kondo, Masanobu Kubota, Koshiro Mizobe

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Abstract

Crack propagation of SCM440H low alloy steel under varying load is enhanced by absorbed hydrogen. Substantial acceleration of crack propagation rate up to 1 000 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, loading frequency and temperature. 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 specimen as thin as 0.8 mm, the constraint of the crack was weak, and the enhanced crack propagation did not appear. However, the introduction of side-groove to 0.8 mm thick specimen resulted in enhanced acceleration. (3) The crack propagation rate in time domain was almost constant irrespective of loading frequency. Lower loading frequency resulted in higher crack propagation rate in cycle domain. (4) The crack propagation at different temperature was controlled by thermal activation process. The crack propagation rate in time domain is controlled by the diffusion of hydrogen. Enough concentration of hydrogen, enough constraint and low loading frequency resulted in enhanced acceleration of crack propagation.

Original languageEnglish
Pages (from-to)1204-1213
Number of pages10
JournalNihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Volume76
Issue number769
DOIs
Publication statusPublished - Jan 1 2010

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High strength steel
Hydrogen
Crack propagation
Temperature
Metals
Chemical activation
Cracks

All Science Journal Classification (ASJC) codes

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

Cite this

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title = "Effects of hydrogen concentration, specimen thickness, loading frequency and temperature on the hydrogen enhanced crack propagation of low alloy steel",
abstract = "Crack propagation of SCM440H low alloy steel under varying load is enhanced by absorbed hydrogen. Substantial acceleration of crack propagation rate up to 1 000 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, loading frequency and temperature. 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 specimen as thin as 0.8 mm, the constraint of the crack was weak, and the enhanced crack propagation did not appear. However, the introduction of side-groove to 0.8 mm thick specimen resulted in enhanced acceleration. (3) The crack propagation rate in time domain was almost constant irrespective of loading frequency. Lower loading frequency resulted in higher crack propagation rate in cycle domain. (4) The crack propagation at different temperature was controlled by thermal activation process. The crack propagation rate in time domain is controlled by the diffusion of hydrogen. Enough concentration of hydrogen, enough constraint and low loading frequency resulted in enhanced acceleration of crack propagation.",
author = "Yoshiyuki Kondo and Masanobu Kubota and Koshiro Mizobe",
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AU - Kondo, Yoshiyuki

AU - Kubota, Masanobu

AU - Mizobe, Koshiro

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Y1 - 2010/1/1

N2 - Crack propagation of SCM440H low alloy steel under varying load is enhanced by absorbed hydrogen. Substantial acceleration of crack propagation rate up to 1 000 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, loading frequency and temperature. 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 specimen as thin as 0.8 mm, the constraint of the crack was weak, and the enhanced crack propagation did not appear. However, the introduction of side-groove to 0.8 mm thick specimen resulted in enhanced acceleration. (3) The crack propagation rate in time domain was almost constant irrespective of loading frequency. Lower loading frequency resulted in higher crack propagation rate in cycle domain. (4) The crack propagation at different temperature was controlled by thermal activation process. The crack propagation rate in time domain is controlled by the diffusion of hydrogen. Enough concentration of hydrogen, enough constraint and low loading frequency resulted in enhanced acceleration of crack propagation.

AB - Crack propagation of SCM440H low alloy steel under varying load is enhanced by absorbed hydrogen. Substantial acceleration of crack propagation rate up to 1 000 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, loading frequency and temperature. 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 specimen as thin as 0.8 mm, the constraint of the crack was weak, and the enhanced crack propagation did not appear. However, the introduction of side-groove to 0.8 mm thick specimen resulted in enhanced acceleration. (3) The crack propagation rate in time domain was almost constant irrespective of loading frequency. Lower loading frequency resulted in higher crack propagation rate in cycle domain. (4) The crack propagation at different temperature was controlled by thermal activation process. The crack propagation rate in time domain is controlled by the diffusion of hydrogen. Enough concentration of hydrogen, enough constraint and low loading frequency resulted in enhanced acceleration of crack propagation.

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