Temper Embrittlement of Cast Duplex Stainless Steels After Long-Term Aging(Materials, Metallurgy & Weldability)
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概要
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Microstructural changes and fracture behavior in cast CF8M duplex stainles steel after aging at 300 to 450℃ for 300 to 10000h have been investigated. Both, optical microscopical and transmission electron microscopical analyses, hardness and ferrite content measurements have been carried out in this study. Strengthening and overaging phenomena of the ferrite phase have been identified by hardness measurements. Spinodal decomposition and heterogeneuous precipitation of G-phase were found to be responsible for strengthening of the ferrite phase after aging with a temper parameter P in the range ca. 1.8 to 4.0. Homogeneuous precipitation of noncoherent α'- and G-phases in ferrite, identified by both optical and transmission electron microscopical analyses for aging with P>4.0 at 450℃, is associated with overaging phenomena. Three different fracture modes, dimples, cleavage and α/γ grain boundary separation, have been observed for Charpy V-notch and CT test specimens fractured at +20℃.
- 大阪大学の論文
著者
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MATSUDA Fukuhisa
Osaka University
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Mraz Lubos
Osaka University:welding Research Institute
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KIKUCHI Yasushi
Osaka University
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Sakamoto Naruo
Mitsubishi Heavy Industries Ltd.:takasago Research & Development Center
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Kawaguchi Seiichi
Mitsubishi Heavy Industries, Ltd.
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Kawaguchi Seiichi
Mitsubishi Heavy Industries Ltd.:takasago Research & Development Center
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Matsuda Fukuhisa
Osaka Univ.
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