γ強化型Fe基超合金の諸特性におよぼすTiおよびAl含有量の影響

概要

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A new γ-strengthened Fe-base superalloy has been developed to provide a high performance alloy less expensive than AISI 660 (A-286). In alloy designing Fe-10/12Cr-20Ni-Ti-Al the amount and the ratio of Ti and Al were optimized to attain adequate precipitation hardening and also to secure high strength at elevated temperatures. The hardness after aging and the proof/tensile strength increased in proportion to atomic fraction of γ and Ti/Al ratio in γ, both of which were calculated through PHACOMP. The higher Ti/Al ratio enhanced the creep-rupture strength, but reduced the hardness in prolonged exposure.The final candidate, RS307, contains 0.06C, 11Cr, 20Ni, 2.75Ti, 0.24Al and 0.006B (all in wt%). The wire produced in quantity proved that the new alloy is a promising fastener material with cold-headability and high-temperature strength equivalent to AISI 660.
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