ニクロムにおける国産クロムの評価

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タイトル別名
  • Valuation of the Home-Produced Chromium in Melting of Nichrome
  • ニ クロム ニ オケル コクサン クロム ノ ヒョウカ

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An investigation was conducted on both mechanical, electrical properties at room temperature and tensile creep-rupture properties at 800°C as well as microstructures of Nichrome, which were prepared by cold drawing of forged and rolled ingots melted in an induction furnace under air of 100 mmHg using various sorts chromium as raw material. The results were as follows.<BR>(1) The difference of both mechanical and electrical properties at room temperature among Nichrome-specimens due to the sort of the raw chromium was almost not able to be detected. From the result of the tensile creep-rupture test at 800°C, it may be said that the properties of Nichrome which was melted with the home-made electrolytic chromium and then deoxidized by the Ni-C alloy were decidedly not inferior to those with the imported chromium. (2) The tensile creep-rupture life at 800°C of specimens was found to be improved considerably by the preheating for a long time after the cold rolling. Particularly, specimens preheated at 900°C·5 hr followed by air cooling had a long rupture-life of 3∼4 times of that of specimens preheated at 800°C·5 hr, although the rupture elongation was smaller in the former than in the latter. (3) As evidences of the anomaly of Nichrome at about 540°C, which has been said to be a short range ordering, the increase of the electrical resistance, the increase in tensile strength and the decrease in elongation were found with decreasing the cooling rate.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 27 (11), 554-557, 1963

    公益社団法人 日本金属学会

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