含Al,Ti,Fe-Ni-Cr系およびFe-Ni-Cr-Co系合金に現われるβ相について

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タイトル別名
  • On the β Phases Identified in Fe-Ni-Cr and Fe-Ni-Cr-Co Alloys Containing Al and Ti. (Study on the Heat-Resisting Alloy (5))
  • ガン Al , Ti , Fe-Ni-Crケイ オヨビ Fe-Ni-Cr-Coケイ ゴウキン ニ アラワレル ベータソウ ニ ツイテ
  • On the β Phases Identified in Fe-Ni-Cr and Fe-Ni-Cr-Co Alloys Containing Al and Ti. (Study on the Heat-Resisting Alloy (5))

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抄録

In the previous reports, it was reported that the creep rupture properties of modified iron-base heat-resisting alloys hardened by precipitation were comparable to those of Nimonic 80A and M-252. In the present investigation, the structural stability of various alloys containing Ti 2% and Al 2% at high temperatures was examined. The matrix of specimens was varied from Ni-rich to Fe-rich compositions. 16 mmφ forged bars were used for age-hardening, electron-microscopic and X-ray diffraction tests. By X-ray diffraction tests on the electrolytic extracts from these specimens after 1000 hr aging, MC, M7C3, M23C6, γ′, σ and β phases were identified. High Ni alloys had remarkable age-hardenable characteristic by the precipitation of γ′ phase. On the other hand,low-Ni high-Fe alloys had no remarkable age-hardenable characteristics and showed over-aging phenomenon after long time aging treatment. The deterioration of age-hardenable characteristics in these low Ni high Fe alloys have relation to the precipitation of massive β phases. The structure of β phase is a body-centered cubic,CsCl,B2 type. Iron and cobalt can be partially substituted for nickel, and aluminum for titanium, so that,the general composition is probably (Ni,Fe)(Al,Ti) or (Ni,Fe,Co)(Al,Ti). By studying pseudo ternary series Fe-Ni-Cr-Co at 732° and 815°C, the matrix composition regions in which β phase precipitated was determined. The various intermetallic compounds in quarternary series NiAl-NiTi-FeTi-FeAl and NiAl-NiTi-CoTi-CoAl were synthesized by vacuum-arc melting technique, and it was demonstrated that these synthetic β phases are crystallographically analogous to precipitated β phases. The behavior of precipitated β phase was investigated by determining the pseudo quarternary diagrams of Ni-Fe-Al-Ti and Ni-Co-Al-Ti systems.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 26 (9), 553-557, 1962

    公益社団法人 日本金属学会

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