Kinetics of Stabilization of Austenite

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  • オーステナイトの安定化の反応速度について
  • オーステナイト ノ アンテイカ ノ ハンノウ ソクド ニ ツイテ

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Abstract

The stabilization of austenite was investigated using the steel sample containing 1%C and 5%Ni. The results obtained were as follows:—(1) The degree of stabilization in terms of the temperature lag before martensite transformation is resumed was expressed as a function of aging time. (2) The Arrhenius’s equation was applicable to express the relationship between the reaction-velocity constant of stabilization and the aging temperature. (3) The reaction-velocity constant of stabilization increased with the increase in prior martensite and the activation energy of stabilization decreased from about 30,000 to about 20,000 cal/mol with the increase in prior martensite from zero to 100%. From these results, as the most probable mechanism of the stabilization, it has been suggested that the stabilization is caused by reducing the mobilities of dislocations during aging at comparatively low temperature such as room-temperature or still lower temperature, because the interstitial solute atoms such as carbon or nitrogen will lock dislocations. On the other hand, stabilization will also be caused by the mechanical blocking of the motion of dislocation lines that can be produced most directly by the precipitation of tiny particles of a secondphase such as carbide or nitride in austenite during comparatively high temperature aging.

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