A Study of the Mossbauer Effect during the Tempering of Iron-Carbon Martensite

概要

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The Mossbauer effect of ^<57>Fe in the iron-carbon martensite steels was measured during their tempering process, and the appearance of the ε-, x- and cementite phases and the bonding nature in them were studied. It was clarified that the x-carbide is formed at the tempering stage III a, the formation of which had not been fully proved in previous X-ray or magnetic measurements. It was also concluded that the electronic states of the iron atoms coordinating the carbon atoms in the martensite and the ε-carbide formed in the stage I are substantially the same, suggesting that the motive force in the stage I is mainly the relaxation of the large strain energy in the martensite structure. The observed localized and additive nature of the iron-carbon interaction, which was concluded from the linear relation between the amount of the internal field reduction and the number of carbon co-ordination for iron atoms in the various phases, seems to indicate that the Alexander-Anderson-Moriya's idea is applicable to the transition metal-metalloid alloys.
社団法人日本物理学会の論文
1968-07-05