純クロムの高温加工性について

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  • Hot-Workability of Pure Chromium. (Study on Pure Chromium, 2nd Report)
  • ジュンクロム ノ コウオン カコウセイ ニ ツイテ

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The hot-workability of pure chromium at 800° to 1,300°C were studied by an impact compression-testing machine.Three kinds of chromium of different purity were used for testing. One of them was of high-purity prepared by electrolysis from chromic acid solution. The other two were of commercial purity prepared by electrolysis and aluminothermic process. They were melted in an argon arc furnace. The results obtained are as follows. (1) The resistance to impact compression of high-purity chromium changes very little in the temperature range from 800° to 1,100°C. (2) The resistance to impact compression of two kinds of commercial chromium is shown to be much larger than that of high-purity chromium. It increases with rising temperature from 800° to 1,100°C and has a peak between 1,100° and 1,200°C. (3) Below 1,000°C only a small number of cracks are observed and they are mostly transgranular. Above 1,000°C the cracks become mostly intergranular and their number increases. (4) It is concluded that the best working temperature for high-purity chromium ingot exists around 900°C. (5) It seems that the abnormal temperature dependence of the resistance to impact compression of commercial chromium is due to nitrogen atoms dissolved in the grains.

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