60%Cr-25%Fe-15%Mo系合金におけるCoの影響について

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  • Effect of Cobalt on the High Temperature Properties of 60%Cr-25%Fe-15%Mo Type Alloys. (Studies on Chromium-Base Heat-Resisting Alloys, 1st Report)
  • 60 Cr-25 Fe-15 Moケイ ゴウキン ニ オケル Co ノ エイキョウ ニ ツイテ

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抄録

It is accepted that the most promising Cr-base alloys for high temperature service are 60%Cr-Fe-Mo alloys containing 15∼25%Fe and 25∼15%Mo. Then the effect of cobalt on 60%Cr-Fe-Mo type alloys with various combination of iron and cobalt content, prepared by rapid melting in a Tammann furnace, was investigated by means of mechanical and metallographical tests. The results obtained were as follows: (1) As the liquidus temperature of the alloys is lowered by replacing iron with cobalt, they can be prepared easily. (2) In any case before and after aging, the more the content of cobalt in the alloys increases, the higher the hardness becomes. (3) The creep property is best in alloys containing 10∼15%Co. (4) Generally, the oxidation-resisting property of the alloys is good. (5) To the alloys below 10%Co can be attributed the possibility of hot-working, and it seems that the temperature of about 1,200° will be suitable for the working. (6) The amount of the σ phase in the matrix of the alloys suddenly increases when the cobalt content exceeds 15%. This phenomenon corresponds with that of the inferiority of the high temperature properties of the alloys above 15%Co.

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