酸化物分散強化型ニッケル基超合金の開発

概要

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An oxide dispersion strengthened (ODS) nickel-base superalloy, TMO-2 which has an extremenly high creep strength, has been developed by employing a matrix with a composition modified from that of a high temperature strength cast alloy previously developed based on the alloy design method of our institute. (1) The ODS superalloy TMO-2, when processed by mechanical alloying using nickel pellets of 3-7mmφ as balls in the attritor, consolidation by extrusion, and isothermal annealing, showed a creep rupture life of 3500h under a test condition of 1050℃ and 16kgf/mm^2. (2) Another batch of ODS superalloy TMO-2, processed by mechanical alloying using steel balls of 9.5mmφ in the attritor, consolidation by extrusion, zone annealing, and solution and aging heat treatment, showed a creep rupture life of 7476h under the same test condition of 1050℃ and 16kgf/mm^2 as in (1) above. (3) In some of long-time crept speimens of alloy TMO-2, the needle-like M_6C has been developed. This is not harmful for creep rupture life but shows elongation values lower than those of specimens of (1) and (2) above.
1989-03-01