N<SUB>2</SUB>-H<SUB>2</SUB>-CH<SUB>4</SUB>混合ガスによるS15C鋼のイオン軟窒化処理について

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タイトル別名
  • On the Ion-Softnitriding of S15C Steel with N<SUB>2</SUB>-H<SUB>2</SUB>-CH<SUB>4</SUB> Gas Mixtures
  • N2-H2-CH4混合ガスによるS15C鋼のイオン軟窒化処理について
  • N2 H2 CH4 コンゴウ ガス ニヨル S15C コウ ノ イオン ナンチ

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S15C steel was ion-softnitrided with N2-H2-CH4 gas mixtures of various compositions at 823 K for 14.4 ks under a pressure of 6.67×102 Pa. Then, the properties of the produced layer were investigated by means of micro-vickers hardness testing, X-ray diffraction, EPMA analysis and wear testing.<BR>\oindentThe following results were obtained.<BR>(1) In the higher CH4 gas content in the atmosphere, the compound layer was thin (less than 2 μm) and the diffusion layer was shallow or did not exist. That region was approximately given by<BR>(This article is not displayable. Please see full text pdf.) <BR>\oindentat 823 K under a pressure of 6.67×102 Pa.<BR>(2) The ε-Fe2−3 (CN) phase was formed easily by the addition of CH4 gas. The Fe3C phase was formed and the sooting appeared with increasing CH4 gas content in the atmosphere. In the lower N2 gas atmosphere, however, those occurred at the lower CH4 gas content.<BR>(3) The wear characteristic of the ion-softnitrided S15C steel little depended on the phase, thickness (about 7∼13 μm), nitrogen and carbon contents of the compound layer, and the ion-softnitrided S15C steel showed far better wear resistance than the normalized S15C steel. The amount of wear of the ion-softnitrided S15C steel was less than that of the ion-nitrided S15C steel at high speed and load.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 43 (5), 399-404, 1979

    公益社団法人 日本金属学会

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