ガスタービン用 Ni-Cr-Co 系 (20-15-15%) 耐熱鋼の諸性貿におよぼす Nb, V, Ti および N の影響

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In the previous report, ("Hitachi Hyoron" No.11, 1955) the authors described the effects of Nb, V, Ti and N on the properties of Ni-Cr (20-15%) series heat-resisting steel for gas turbines. In this report, the authors examined the effects of Nb, V, Ti and N on the forgeability, solution-treatment, hardness, aging hardness, microstructure, mechanical properties at high temperature, oxidation resistance and creep limits of Ni-Cr-Co (20-15-15%) series heat-resisting steel for gas turbines. The results obtained were summarized as follows : 1) In respect to forgeability, Nb was superior, while the specimen A (which contained no special element) Ti and V were comparatively good next to Nb, and then N had worse effect on it. 2) When the solution temperature was 1200℃, the specimen "A" showed highest aging hardness. Next to the specimen "A", those with N, V, Ti and Nb were good in the term. 3) N conferred the best property in the tensile strength at high temperature, however when the temperature rose above 700℃, the differences between the properties pf steels with different elements became very small. 4) In respect to oxidation resistance, Nb was most effective and V had worse effect on it. 5) As for the creep limit, the specimen "A" was superior, and then, next to "A", specimens containing Ti, N, V and Nb were good in the term.
社団法人日本鉄鋼協会の論文
1956-01-01