Studies on Workability, Heat Treatment Characteristics and Corrosion Resistance for Pressurized Water of Zr-1%Mo-1%Cr and Zr-1%Mo-1%Ni Alloys

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  • Aoki Shigeo
    Central Research Lab., The Furukawa Electric Co. Ltd.

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  • Zr-1%Mo-1%Cr合金およびZr-1%Mo-1%Ni合金の加工性，熱処理性および高温水腐食
  • Zr-1 Mo-1 Cr ゴウキン オヨビ Zr-1 Mo-1 Ni ゴウキン ノ カコウセイ , ネツ ショリセイ オヨビ コウオンスイ フショク

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Abstract

The workability, the effect of the heat treatment on the mechanical properties and the micro-structures, and the corrosion resistance for pressurized water of Zr-1%Mo-1%Cr and Zr-1%Mo-1%Ni alloys which resulted from previous works have been investigated in comparison with Zircaloy 2. The results obtained are summarized as follows. (1) The percent reductions of the alloys drop-forged in the temperature range of 600°∼900°C were nearly same as those of Zircaloy-2. The alloys were cold rolled by 70% without any intermediate annealing. (2) The remarkable hardening occurred in both alloys when they were quenched from β phase. (3) The optimum procedures of the heat treatment to obtain the favourable mechanical properties of Zr-1%Mo-1%Cr and Zr-1%Mo-1%Ni alloys were to temper them at 750°C and 600°C for 100 min respectively, after quenching from 950°C in β phase. (4) The weight gain of Zr-1%Mo-1%Cr alloy over the corrosion period of 500 hr in pure water at 300°C under pressure of 80 kg/cm2 was a little higher than that of Zircaloy-2 but much lower than that of Zr-1%Mo-1%Ni alloy.

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