Cr基超耐熱合金の高温曲げクリープ特性ならびにそれにおよぼす添加元素の影響

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タイトル別名
  • The High Temperature Bending Creep Characteristics of Cr-Base Alloys and Effect of Additional Elements on Them. (Studies on Cr-Mo-Fe Super-Heat-Resisting Alloys, 3rd Report)
  • Crキ チョウタイネツ ゴウキン ノ コウオン マゲ クリープ トクセイ ナラビニ ソレニ オヨボス テンカ ゲンソ ノ エイキョウ

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By means of mechanical and metallographical tests the high temperature bending creep characteristics of Cr-base alloys were investigated, on Cr-Mo-Fe alloys and some alloys in which a part of Fe was replaced with 2∼6%Co, 1%Cb and 0.5%B, or all of Fe with Ni. The specimens were prepared by rapid melting in a carbon-resistance furnace and injecting into a silica tube. The results obtained are summarized as follows: (1) The associated changes in creep strength, hardness and microstructure show that high temperature properties of Cr-Mo-Fe alloys mainly depend on the dispersed precipitation of σ phase in α matrix. The creep strength is most excellent in alloys containing 60%Cr and 20∼30%Mo. (2) The creep strength of solution-treated alloys are found to be more excellent than that of cast alloys. (3) Effect of Co on the creep characteristics of Cr-Mo-Fe alloys is not so remarkable, because the precipitation of σ phase is increased by replacing Fe with Co, this resulting in an embrittlling of the alloy. (4) The creep strength of Cr-Mo-Fe alloys is increased to some extent with addition of 1%Cb or 0.5%B. (5) Cr-Mo-Ni alloys are found to be harder and more brittle than Cr-Mo-Fe alloys, owing to the increase of σ phase in amount and the martensitization of β phase; thus their creep strength is low except in the case of 60%Cr-30%Mo-10%Ni alloy.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 27 (3), 105-112, 1963

    公益社団法人 日本金属学会

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