Fe-Ni-C合金のTRIP現象に及ぼす前加工の影響

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The effect of pre-deformation on the martensitic transformation induced plasticity (TRlP) in austenitic Fe-Ni-C alloys (their Ms temperatures are below room temperature) was studied by tensile tests between -196℃〜80℃. Pre-deformation up to 65% in reduction was given by rolling at 200℃. Since the rolling temperature was above Md temperature, all the specimens consisted of a single austenitic phase even after rolling. The TRIP was observed in the pre-deformed specimens as well as in the non-deformed ones, showing the maximum elongation at a certain temperature between Ms and Md. The value of maximum elongation (ε_<max>) decreased with the degree of pre-deformation. The amount of the increase in elongation by TRIP (Δε_A), which was defined as the difference between ε_<max> and the elongation of austenite itself (ε_A), was found to be independent on the degree of pre-deformation in alloys having less than 0.2% carbon, but in an alloy with 0.4% carbon, the Δε_A was decreased by pre-deformation. When ε_A,ε_<max>, and the elongation of martensite (ε_M) which was obtained by the subzero treatment, were compared with each other, the ε_M was scarcely decreased by pre-deformation. So, both the strength and elongation of martensite formed from pre-deformed austenite by cooling the specimen to a temperature below Ms temperature were higher than those of pre-deformed austenite itself (without TRIP). The difference (Δε_M) betweenε_<max> and ε_M decreased with pre-deformation even in 0.2% C alloys, being different from the trend of Δε_A. Finally, the Luders type deformation, which appeared in heavily pre-deformed specimens, was observed in detail and discussed in comparison with other phenomena caused by the stress induced martensitic transformation.
社団法人日本材料学会の論文
1976-08-15

Fe-Ni-C合金のTRIP現象に及ぼす前加工の影響

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