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Creep-fatigue interaction properties of nickel-based superalloy 617

Acta Metallurgica Sinica(English Letters) 2011年第2期24卷 125-131页

作者： Kazuo KOBAYASHI masao hayakawa Megumi KIMURA National Institute for Materials Science (NIMS) Materials Reliability Center

High-temperature fatigue properties were investigated for a nickel-based superalloy 617 as a typical candidate material for high-temperature components using an advanced ultra super critical （A-USC） power plant. Creep-fatigue data obtained by strain-controlled tests at 700 ？ C was analyzed for the superalloy 617 focused on position of hold at peak strain in comparison with continuously cycled tests. The fatigue life was the shortest with the hold tensile strain wave, which showed mainly intergranular fracture appearance. The life was the longest with symmetrical triangular wave which fractured from the specimen surface, while the wave with the hold compressive strain showed partially intergranular fracture appearance and the life was middle in the both waves. In this study, it is discussed with the creep-fatigue interaction for the superalloy 617.

关键词： A-USC power plant Nickel-based superalloy Creep-fatigue interaction Fractography

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Mn as An Impurity in Synthesized Diamonds Incorporated from the Metal Solvent for Growth at High Pressure-High Temperature

Mn as An Impurity in Synthesized Diamonds Incorporated from ...

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18th International Conference on High Pressure Science and Technology

作者： masao Wakatsuki Shinjiro hayakawa National Institute of Advanced Industrial Science and Technology Tsukuba 305-8565Japan Applied Physics and Chemistry Hroshima UniversityHiroshima 739-8527Japan

＜正＞We have grown many single crystals of diamond using a variety of alloy solvents, and analyzed them by x-ray fluorescence method using synchrotron radiation to make it clear which of the solvent-composing-elements can be dissolved in diamond. According to a series of our previous investigation on Ti, Cr. Mn, Fe, Co, Ni and Cu[l-6], concentrations and distribution of dissolved Ni, which were dependent on the growth sectors, were directly determined. Co was also revealed to be dissolved in diamond with the same distribution behavior as that of Ni. It showed a XANES spectrum very similar to that of Ni, which lead us to conclude dissolution of Co at the same position in the lattice that was occupied by Ni. Cr, Fe and Cu have not been detected at a level higher than a fraction of 1 ppm, the detection limit of the method. Mn showed its concentrations of the same order levels as those of Ni and Co, However, its distribution dependence on the growth sector is different from that of Ni and Co. That is, several ppm of Mn could be detected even in the {100} growth sector where Ni or Co were never detected. This behavior of Mn made us hesitate to conclude that Mn was dissolved in the diamond lattice. In the previous analyses, the excitation x-ray beam was 100μm in diameter and might have been two large compared to the density of tiny Mn-containing inclusions if they existed. Such a situation might have let Mn distribution appear as if it had been uniform. Very recently, an intense narrow beam of about 4uuuuuuuuum in diameter have been developed in another synchrotron beam facility （realized by one of the present authors （S.H.） using curved mirrors）, and Mn was again investigated with the same diamond wafer at an excitation energy of 10 keV. Many tiny particles containing Mn were clearly imaged in the two-dimensional spatial distribution of the Mn-kα fluorescence, and in the distribution of the transmitted excitation beam intensity as well. Fig

关键词： diamond impurity manganese inclusions x-ray fluorescence synchrotron radiation

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