Calorimetric Analysis of Aging Reaction in Ni Maraging Steels Containing Ti

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  • 比熱測定によるTiを含むNiマルエージング鋼の時効反応の解析
  • ヒネツ ソクテイ ニヨル Ti オ フクム Ni マルエージング コウ ノ ジ

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Abstract

The aging reactions in 18–20%Ni maraging steels containing Co, Mo and Ti have been investigated by means of calorimetric analysis and hardness measurement. With excess addition of Ti above about 1%, the formation of Mo rich zones, which is characteristic of Ti-free maraging steels, seems to be perfectly suppressed, and the precipitation of phases containing Ti is considered to occur.<BR>In an Fe-18%Ni-10%Co-5%Mo-2.1%Ti alloy, for example, the specific heat versus temperature curve is characterized by the appearance of three evolution peaks at 470, 540 and 600°C, corresponding to the precipitation of a low temperature phase containing Ti, Ni3Ti(DO24) and Ni3Mo. On the isothermal aging at about 500°C, this alloy hardens by precipitation of the low temperature Ti-phase in the early stage and by precipitation of Ni3Mo in the later stage.

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