Influence of Sigma Phase on Hydrogen Induced Cracking of Duplex Stainless Steel(Materials, Metallurgy & Weldability)
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概要
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New software for the 3-dimensional reconstruction of the image of the fracture surface from a stereo-pair of SEM photographs was developed using a personal computer. This software was applied to clarify the effect of sigma phase on hydrogen induced cracking of SUS329J1 duplex stainless base metal. The hydrogen induced cracking was recognized in the as-received SUS329J1 base metal and showed quasi-cleavage fracture. The cross-sectional microstructure observation directly revealed that hydrogen induced cracking occurred in ferrite, while austenite showed ductile fracture. The sigma phase enhanced hydrogen embrittlement and many secondary cracks due to sigma phase were observed. Sigma phase was observed for the sample heated at 1023K for 72ks. The existence area of sigma phase was always the bottom area and lower than other areas on the 3-dimensional fracture surface and indicated that sigma phase strongly promoted hydrogen induced cracking. According to the cross-sectional microstructure observation, it was found that sigma phase itself and sigma/ferrite phase boundaries were preferential initiation sites of hydrogen induced cracking, while quasi-cleavage fracture assisted hydrogen induced cracking in the SUS329J1 base metal.
著者
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IKEUCHI Kenji
Osaka University
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KURODA Toshio
Osaka University
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Ikeuchi K
Kyoto Univ. Kyoto Jpn
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Ikeuchi K
大阪大学接合科学研究所
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Kuroda T
Osaka University
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Ikeuchi Kenji
Welding Research Institute Osaka University
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NAKADE Katsuyuki
Osaka University
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Nakade K
Osaka University
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