Hydrogen-induced delayed fracture of a martensitic steel with fine prior-austenite grain size

Y. Kimura, S. Takagi, T. Hara, S. Terasaki, K. Tsuzaki

Research output: Contribution to journalConference article

8 Citations (Scopus)

Abstract

The influence of the grain size of the prior-austenite on the hydrogen-induced delayed fracture property was investigated for a medium carbon tempered martensitic steel (JIS-SCM440) with a tensile strength of 1400MPa. Thermomechanical treatment, which consists of a warm working at 873K by multi-pass bar rolling of tempered martensite and subsequent rapid austenitizing at 1093K for 1s, resulted in the refinement of the prior-austenite grain to 3 μm. The hydrogen embrittlement susceptibility was examined using a conventional creep test machine under a constant load for hydrogen pre-charged notched specimens with a stress concentration factor of 4.9. The critical diffusible hydrogen content, below which the specimen never fracture, was approximately 0.24 mass ppm for the fine-grained specimen under an applied stress of 0.9TS, two times higher than that of the conventional QT sample (prior-austenite grain size; 17 μm). The immersion test in 0.1M HCl water solution (pH=1.0) at 298K showed that the intruded hydrogen content (HE) at 100h was 0.14 mass ppm for the fine-grained sample which was almost the same as that of the conventional QT sample (0.17 mass ppm).

Original languageEnglish
Pages (from-to)403-406
Number of pages4
JournalJournal De Physique. IV : JP
Volume112 I
DOIs
Publication statusPublished - Jan 1 2003
Externally publishedYes
EventInternational Conference on Martensitic Transformations - Espoo, Finland
Duration: Jun 10 2002Jun 14 2002

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Martensitic steel
austenite
Austenite
Hydrogen
grain size
steels
hydrogen
thermomechanical treatment
hydrogen embrittlement
creep tests
Thermomechanical treatment
Hydrogen embrittlement
stress concentration
martensite
Martensite
tensile strength
submerging
Carbon steel
Stress concentration
Creep

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Hydrogen-induced delayed fracture of a martensitic steel with fine prior-austenite grain size. / Kimura, Y.; Takagi, S.; Hara, T.; Terasaki, S.; Tsuzaki, K.

In: Journal De Physique. IV : JP, Vol. 112 I, 01.01.2003, p. 403-406.

Research output: Contribution to journalConference article

Kimura, Y. ; Takagi, S. ; Hara, T. ; Terasaki, S. ; Tsuzaki, K. / Hydrogen-induced delayed fracture of a martensitic steel with fine prior-austenite grain size. In: Journal De Physique. IV : JP. 2003 ; Vol. 112 I. pp. 403-406.
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AB - The influence of the grain size of the prior-austenite on the hydrogen-induced delayed fracture property was investigated for a medium carbon tempered martensitic steel (JIS-SCM440) with a tensile strength of 1400MPa. Thermomechanical treatment, which consists of a warm working at 873K by multi-pass bar rolling of tempered martensite and subsequent rapid austenitizing at 1093K for 1s, resulted in the refinement of the prior-austenite grain to 3 μm. The hydrogen embrittlement susceptibility was examined using a conventional creep test machine under a constant load for hydrogen pre-charged notched specimens with a stress concentration factor of 4.9. The critical diffusible hydrogen content, below which the specimen never fracture, was approximately 0.24 mass ppm for the fine-grained specimen under an applied stress of 0.9TS, two times higher than that of the conventional QT sample (prior-austenite grain size; 17 μm). The immersion test in 0.1M HCl water solution (pH=1.0) at 298K showed that the intruded hydrogen content (HE) at 100h was 0.14 mass ppm for the fine-grained sample which was almost the same as that of the conventional QT sample (0.17 mass ppm).

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