Tearing Resistance Properties of Cr-Mo Steels with Internal Hydrogen Determined by the Potential Drop Method

The tearing resistance, dJ/da , of conventional 2.25Cr-1Mo steels and a V-bearing steel (2.25Cr-1Mo-0.3V steel) with internal hydrogen was measured using the effective offset potential drop method. Internal hydrogen refers to test specimens that are precharged (thermally charged) prior to testing. I...

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Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2015-12, Vol.46 (12), p.5626-5637
Main Authors: Konosu, Shinji, Shimazu, Hidenori, Fukuda, Ryohei
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemistry and Materials Science
Chromium
Chromium molybdenum steels
Embrittlement
Hydrogen
Hydrogen embrittlement
Materials Science
Metallic Materials
Metallurgy
Nanotechnology
Physical metallurgy
Potential drop
Steel
Steels
Structural Materials
Surfaces and Interfaces
Tearing
Thin Films
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Summary:The tearing resistance, dJ/da , of conventional 2.25Cr-1Mo steels and a V-bearing steel (2.25Cr-1Mo-0.3V steel) with internal hydrogen was measured using the effective offset potential drop method. Internal hydrogen refers to test specimens that are precharged (thermally charged) prior to testing. In general, Cr-Mo steels, used widely in the refining and petrochemical industries, are susceptible to temper embrittlement. However, very few studies have dealt with the effects of hydrogen and temper embrittlement on the tearing resistance. Test specimens were prepared by subjecting them to normalizing, tempering, and post-weld heat treatments that simulated actual conditions. Some specimens were embrittled by step cooling. Hydrogen substantially reduced dJ/da for all samples except for that for the V-bearing steel, and temper embrittlement caused additional adverse effects on dJ/da for samples with internal hydrogen for which the temper embrittlement parameter, i.e ., the J-factor, was large.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-015-3145-4