Fe-W, Fe-Nb および Fe-Ta 系合金の析出硬化

概要

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Fe_2W, Fe_2Nb and Fe_2Ta Laves phases (MgZn_2 type C 14) were found in iron alloys containing 6.95 wt% W, 0.35∿2.50 wt% Nb and 0.86∿2.40 wt% Ta. The activation energy for the formation of this phase was estimated at about 51.0 kcal/mol in the Fe-W, 61.5∿64.3 kcal/mol in the Fe-Nb and 60.0∿60.4 kcal/mol in the Fe-Ta binary alloy by hardness measurements. An addition of niobium or tantalum to pure iron was effective for solution and precipitation hardening, and both elements showed the similar effects as solute at once. In the ternary alloys containing nickel, manganese, cobalt, silicon and chromium, the precipitation process of Laves phase was similar to that in the binary alloy, on the other hand, in the Fe-W-Mn ternary alloy containing 5.6 wt% manganese the reversed austenite precipitated in Widmanstatten wise in the ferritic matrix at aging temperature 650∿850℃, and this austenite transformed to martensite by water-quenching from aging temperature.
社団法人日本鉄鋼協会の論文
1970-11-01