耐熱鋼 A 286 の高温強度におよぼす熱処理の影響

概要

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In order to improve the high-temperature strength of the heat-resistant alloy A286, it was suggested from the previous work (Zairyo Shiken, 10(1961) No.90, p.70 ; Tetsu-to-Hagane, not yet published) that grain boundary precipitates such as G phase (Ni_<13>Si_6Ti_8) and η phase (Ni_3Ti) had to be eliminated by proper selections of heat treatment and/or chemical composition. From a point of view as abovementioned, the effect of heat treatment on the high-temperature strength was investigated in the present work. Solution temperatures were varied from 900℃ to 1100℃ and aging temperatures were selected at 650℃ and 718℃. Creep rupture tests and short-time tensile tests at 650℃ were carried out. X-ray diffraction was tested and an electron-microscope was used for the study of microstructures. The results obtained showed that the grain boundary precipitates diminished with increasing solution temperature and decreasing aging temperature, and the high-temperature strength was increased with disappearance of grain boundary precipitates. In the microstructures as heat-treated with using a solution-temperature higher than 1040℃ and an aging temperature of 718℃, precipitations of TiC with various flake-type morphology were observed at grain boundaries. These precipitates, however, seemed to have little effect on the high temperature strength.
社団法人日本鉄鋼協会の論文
1963-02-01