Fe-Mn 合金の高圧処理によるε相の生成と引張応力下でのその相の安定性

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The A_s and M_s temperature in the martensitic transformation of Fe-Mn alloys under hydrostatic pressures up to 35.5 kbar were measured by the differential thermal analysis. The progresses of γ→ε and ε→α transformation as influenced by the pressure and temperature changes and the effect of the tensile stress on them were discussed from a thermodynamical point of view. The main results obtained are as follows : 1) The A_s and M_s temperatures in the γ⇄α transformation of alloys containing 4.8% or 6.76% of Mn, by increasing the pressure, were lowered at an approximate rate of 40℃/10 kbar, while those in the γ⇄ε transformation of alloys containing 6.76 to 28.24% of Mn were raised at an approximate rate of 40℃/10 kbar. 2) The A_s and M_s temperatures calculated on the basis of the free energy changes of the phases were in a good agreement with those observed. 3) The γ→ε transformation progressed rapidly in the vicinity of the <M_s>^<γ→ε> temperature and then gradually with further decreasing the temperature. 4) In order to stabilize at the ambient pressure and temperature, the ε phase which had been formed by pressurizing, it was required that the <M_s>^<ε→α> and the <A_s>^<ε→γ> temperatures of the alloy were lower and higher, respectively than the room temperature. 5) The increase in the tensile strength was obtained only for the specimens in which the ε phase had been formed by pressurizing. The reason for the increase in the strength was explained on the basis of the thermodynamics for the γ→ε transformation under tensile stress.
社団法人日本鉄鋼協会の論文
1974-04-01

Fe-Mn 合金の高圧処理によるε相の生成と引張応力下でのその相の安定性

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