γ′析出型耐熱合金の高温強度特性におよぼす基質組成の影響 : γ′析出型耐熱合金の系統的研究 I

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The series of eleven gamma-prime precipitated heat-resisting alloys of various matrix compositions were studied from the view point of correlation of high-temperature load-carrying ability and structural stability. The matrix compositions of specimens were different between Ni-base alloys and Fe-base alloys. Air-and vacuum-arc melted and forged 16mm φ bars were used for solution annealing, age hardening, short-time tensile, high-temperature creep-rupture tests, X-ray diffraction and electron metallography. The identification of precipitated phases were carried out with the specimens aged for 1, 000 hours at 732 and 815℃, respectively. The changes of matrix-lattice parameters by aging treatments, γ′-matrix lattice mismatch and the growth of γ′phase particles were also measured in these specimens. As the Co content in Ni-base alloys was enhanced increased, high-temperature strength properties and γ′-matrix lattice mismatch of these alloys were increased and the growth of γ′particles was delayed. High-temperature strength properties and lattice mismatch were decreased with these alloys, as the Fe content in Ni-base alloys was raised. On the other hand, with Fe-base alloys high-temperature strength, age-hardening properties and lattice parameters of matrix in aged specimens were decreased markedly, as the Co content was increased. It was found that the deterioration of high-temperature characteristics in Fe-base alloys was principally caused by a precipitation of massive β phase.
社団法人日本鉄鋼協会の論文
1961-11-01

著者

加藤正一
日本冶金工業(株)研究開発部

γ′析出型耐熱合金の高温強度特性におよぼす基質組成の影響 : γ′析出型耐熱合金の系統的研究 I

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