Stress corrosion cracking growth tests of small compact tension specimens with different pre-crack length in high temperature water containing hydrogen peroxide

Nakano, Junichi; Sato, Tomonori ; Kato, Chiaki ; Kaji, Yoshiyuki ; Yamamoto, Masahiro ; Tsukada, Takashi ; Iwata, Yusuke*; Tomota, Yo*

Hydrogen peroxide (H $_{2}$ O $_{2}$ ) is produced by water radiolysis. To study effects of H $_{2}$ O $_{2}$ environments on SCC behavior of stainless steel, crack growth test was conducted in high temperature water containing H $_{2}$ O $_{2}$ . Two types of 0.25T-compact tension (CT) specimens were prepared from thermally sensitized type 304 stainless steel. After fatigue pre-crack length of 4.4-4.8 mm introduction, the pre-crack was shortened to 1.1-1.7 mm. For the CT specimens with long pre-crack length, intergranular SCC (IGSCC) was observed near side grooves. For the CT specimens with shortened pre-crack length, IGSCC area spread to the central region. SCC grew linearly in H $_{2}$ O $_{2}$ environments although SCC growth in O $_{2}$ environments branched off. As outer oxide layer on the pre-crack, Fe $_{3}$ O $_{4}$ was observed in O $_{2}$ environments. In H $_{2}$ O $_{2}$ environments, it changed from Fe $_{2}$ O $_{3}$ toward the crack tip to Fe $_{3}$ O $_{4}$ .

Language	:	English
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Meeting title	:	International Cooperative Group on Environmentally Assisted Cracking 2012 (ICG-EAC 2012)
Held date	:	2012/05
Location (city)	:	Qubec
Location (country)	:	Canada
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Keywords	:	no keyword
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Cooperating Institute	:	経済産業省原子力安全・保安院

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Registration No. : BB20120371
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