高効率廃棄物発電ボイラ過熱器管用Ni-Cr-Mo系合金の機械的特性

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  • Mechanical Properties of Ni-Cr-Mo Alloy Applied to Superheater Tube for High-Efficiency Waste Power Generation Boiler
  • コウコウリツ ハイキブツ ハツデン ボイラ カネツキカンヨウ Ni Cr Moケイ ゴウキン ノ キカイテキ トクセイ

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A Ni-Cr-Mo alloy, JHN-24 has been developed as a new superheater tube material for advanced waste incinerator. In order to evaluate its thermal stability, microstructure and mechanical properties were investigated before and after thermal exposure. In solid solution condition, the microstructure consisted of fcc γ single phase and this alloy was able to keep relatively high strength up to 550°C. The changes in microstructure and mechanical properties were observed after thermal exposure. In the temperature range 450-550°C, as exposure temperature and time increase, tensile strength, 0.2% yield strength increased and elongation, reduction of area decreased. However the alloy sustained higher than 40% in elongation and reduction of area under any exposure condition. Moreover it was confirmed that impact strength decreased as temperature and time increased in the temperature range 500-550°C but was higher than 160 J/cm2 under any conditions. Transmission electron microscopy observation revealed that Pt2Mo-type intermetallic compound precipitated in fine and uniform condition. It was suggested that Pt2Mo-type intermetallic compound phase which was coherent with γ matrix didn’t show harmful effect as μ and P phase.

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  • 日本金属学会誌

    日本金属学会誌 66 (6), 544-548, 2002

    公益社団法人 日本金属学会

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