On the Characteristics of Strength at High Temperature of the Iron Base Heat-Resisting Alloys of Precipitation Type. (Study on the Heat-Resisting Alloy (3))

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  • 鉄基析出型耐熱鋼の高温強度特性について
  • テツキ セキシュツガタ タイネツ コウ ノ コウオン キョウド トクセイ ニ ツイテ
  • On the Characteristics of Strength at High Temperature of Iron-Base Heat-Resisting Alloys of Precipitation Type. (Study on the Heat-Resisting Alloy (4))

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Abstract

Following the rapid development of many superior nickel and cobalt-base alloys strengthened by the presence of the dispersions of intermetallic compounds within matrix, iron-base alloys of such types., e.g., A-286 and W-545, have been developed recently. The purpose of this investigation is to contribute to the development of these iron-base alloys, by giving data on the hot-strength potentialities and the effects of melting processes on the high temperature properties of modified alloys containing a small amount of Mo, W, V, Cb, Ti, Al and B in iron-base Cr 16%, Ni 20∼25% and Co 0∼10% alloys. Both air- and vacuum-melted forged bars were used for solution annealing, age hardening, short-time tensile tests, high-temperature creep-rupture tests, electron-microscopic and X-ray examinations. Specimens containing Ti and Al have conspicuous age-hardenable characteristics. These specimens are much the same in solution-annealing and age-hardening characteristics and short-time tensile strength, but the ductility after tensile test in the vacuum-melted specimens is superior to that in the air-melted. The creep-rupture properties of vacuum-melted alloys investigated up to 732°C were better than those of commercial alloys such as A-286, LCN-155 or S-816 and were comparable to those of Nimonic 80 A. By the X-ray diffraction data on the electrolytic extracts from these specimens after creep-rupture tests, MC, M23C6, σ phase, Lave’s phase, γ′ phase, boride and η phase have been identified. It might be suggested that the remarkable age-hardening and the high-rupture strength properties of these alloys are principally caused by a precipitation of γ′ type Ni3(Al,Ti).

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