Effect of Prestraining on the Ductility of Pure Chromium

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  • 純クロムの延性におよぼすPrestrainの効果について
  • ジュンクロム ノ エンセイ ニ オヨボス Prestrain ノ コウカ ニ ツイテ

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The effect of prestraining on the ductility of pure chromium at room temperature were studied and the following results were obtained: (1) The room-temperature ductility of chromium containing 0.004% nitrogen, which is obtained by electrolysis of chromic acid solution, can be improved considerably by means of prestraining by rolling. The most effective working conditions are: Rolling reduction 0.75∼3% at rolling temperature of 400°C and 3∼8% at 500°C. (2) Needle-like precipitates, probably nitrides, are observed in electron micrographs of properly prestrained and ductile specimens after polishing and electrolytic etching. (3) The effect of prestraining is considered to be due to the decrease of dissolved nitrogen atoms caused by the precipitation of nitride. The details of the effect can be explained from the correlation between (i) the amount of prestrain which controls the distribution of lattice defects and the enhancement of nitrogen and (ii) the temperature of prestraining which controls the solubility and diffusion of solute nitrogen atoms.

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