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Research Papers: Materials and Fabrication

Combined Effect of Temper and Hydrogen Embrittlement on Threshold for Hydrogen-Induced Fracture in Cr-Mo Steels

[+] Author and Article Information
Hidenori Shimazu

Graduate School of Ibaraki University,
4-12-1, Nakanarusawa, Hitachi,
Ibaraki, 316-8511, Japan
e-mail: 11ND202R@hcs.ibaraki.ac.jp

Shinji Konosu

Ibaraki University,
4-12-1, Nakanarusawa, Hitachi,
Ibaraki, 316-8511, Japan
e-mail: konosu@mx.ibaraki.ac.jp

Yoichi Tanaka

Nippon Steel Techno-Research,
Arde-Building-Higobashi,
9F 1-15-27, Edbori, Nishiku,
Osaka City, Osaka, 550-0002, Japan
e-mail: tanaka-youichi@nstr.co.jp

Masao Yuga

JFE Steel Corporation,
Steel Products Research Department,
1-1, Minamiwatarida-cho, Kawasaki-ku,
Kawasaki 210-0855, Japan
e-mail: m-yuga@jfe-steel.co.jp

Hiroshi Yamamoto

Chiyoda Corporation,
Minatomirai Grand Central Tower,
4-6-2, Minatomirai, Nishi-ku,
Yokohama 220-8765, Japan
e-mail: hiroshiyamamoto@ykh.chiyoda.co.jp

Naotake Ohtsuka

Mu Ltd.,
REC-Hall, 1-5 Yokotani,
Seta Oe-cho,
Ohtsu 520-2194, Japan
e-mail: ohtsuka@mu-frontier.com

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the Journal of Pressure Vessel Technology. Manuscript received March 30, 2012; final manuscript received November 22, 2012; published online March 18, 2013. Assoc. Editor: David L. Rudland.

J. Pressure Vessel Technol 135(2), 021406 (Mar 18, 2013) (7 pages) Paper No: PVT-12-1035; doi: 10.1115/1.4023423 History: Received March 30, 2012; Revised November 22, 2012

This paper presents the results of the research activities of the subcommittee on hydrogen embrittlement of the Japan Pressure Vessel Research Council (JPVRC). The combined effect of temper embrittlement and hydrogen embrittlement in Cr-Mo steels is discussed. It has been recognized that Cr-Mo steels used widely in the refining and petrochemical industry are quite susceptible to temper embrittlement. Although the synergistic relation between temper embrittlement and hydrogen embrittlement is a matter of major concern, studies regarding this subject are rarely encountered. Task group VIII (TG8) of the JPVRC conducted fracture toughness tests for three kinds of 2.25Cr-1Mo steels and 2.25Cr-1Mo-0.3 V steel. These steels were prepared by subjecting them to normalizing, tempering, and postweld heat treatments (PWHTs) which simulated actual conditions. Some specimens were embrittled by step cooling (Socal-1 treatment). It was found that the threshold for hydrogen-induced fracture was lowered when the specimen was exposed to pressurized hydrogen gas (15 MPa) for 48 h at 450 °C and there was no marked indication of the synergistic action concerning this embrittlement.

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Figures

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Fig. 1

Geometry of compact tension specimen

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Fig. 2

Block diagram of a dc-potential drop measurement system

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Fig. 3

Offset potential drop technique to determine the onset of subcritical crack growth

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Fig. 4

KIH and KIC are plotted for the corresponding FATT, together with the data obtained by TG2 [5] and TG7 [7] of the JPVRC

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Fig. 5

Hydrogen thermal desorption results [9] obtained for remnant parts of broken H-charged Charpy specimens of the steels A, B, C, and V, where the heating rate was 100 °C/h

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Fig. 6

Typical SEM images of the fracture surfaces for the H-charged SCHT steel-B associated with a progressive increase in crack extension. (a) Mainly IG mode, (b) IG + QC modes, (c) QC + MVC modes.

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Fig. 7

Typical SEM images of the fracture surfaces at the initiation region for the H-charged steel-C with different heat treatments. (a) as-PWHT and (b) PWHT + SCHT.

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Fig. 8

Typical SEM images of the fracture surfaces at the initiation region for the H-charged steel-V with different heat treatments (a) as-PWHT (b) PWHT + SCHT.

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