鉄-炭素系合金の高圧下における M_s 温度およびマルテンサイト組織

概要

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The effect of Mn, Si or Cr on the M_s-temperature and the martensite structure of Fe-0.3%C alloy were examined under hydrostatic pressure up to 41 kbar using a "girdle" type high pressure apparatus. The results obtained are as follows ; (1) The M_s-temperature was lowered approximately 40℃/10 kbar in all alloys and its tendency was not significantly affected by alloying elements. (2) The measured M_s-temperatures at 1 atm (≃0.001 kbar), 29 and 38.5 kbar are in reasonable agreement with those calculated by the Predmore's equation concerning the free energy change for γ-α transformation. (3) The plate-like structure was observed as a result of the martensite transformation above 38.5 kbar. The reason for the appearance of this structure can be explained qualitatively by P-T diagram of iron. (4) The hardness of martensitic structures increases with an increase of pressure. This tendency can be interpreted by the fact that the M_s-temperature is lowered by pressure, accompanying with the change of martensite structure.
社団法人日本鉄鋼協会の論文
1974-01-01