Evaluation of Boron Solubility in Iron Solid Solution by Radio-frequency Glow-discharge Optical Emission Spectroscopy

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  • 高周波グロー放電発光分析法を用いた鉄固溶体におけるホウ素の固溶限測定
  • コウシュウハ グロー ホウデンハツ コウブンセキホウ オ モチイタ テツコヨウタイ ニ オケル ホウソ ノ コヨウゲン ソクテイ

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Abstract

<p>The solubility of boron in α- and γ-iron solid solutions was investigated by diffusion-couple experiments in the Fe-B, Fe-Ni-B, and Fe-Si-B systems. Diffusion couples composed of iron foils and Fe2B bulk specimens were annealed at various temperature between 750ºC and 1100ºC, and the concentration profile of boron from the end-surface of the iron part were measured by the radio-frequency glow-discharge optical emission spectroscopy (rf-GD-OES). It was found that rf-GD-OES was effective in analyzing boron of low concentrations in iron. The solubility limit of boron in α- and γ-iron determined by analyzing the concentration profiles in the diffusion couples was found to agree with that reported by Cameron and Morral for α-iron, and that by Brown et al. for γ-iron. It was also suggested that the invariant reaction between α-iron, γ-iron and Fe2B was a eutectoid reaction, as had been indicated by Cameron and Morral.</p>

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 106 (6), 292-301, 2020

    The Iron and Steel Institute of Japan

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