Surface Modification of SKD61 Die Steel by Forming of an Al Thin Film, Heating, Quenching and Nitriding

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  • Tsuji Shinji
    Department of Mechanical and Precision System, School of Science and Engineering, Teikyo University
  • Furusawa Toshiaki
    Department of Mechanical and Precision System, School of Science and Engineering, Teikyo University
  • Saito Tetsuo
    Mechanical Engineerings and Metals Division, Industrial Research Institute of Tochigi Prefecture
  • Kamada Masahiko
    Department of Engineering, Nihon Denki Kogyo Co. Ltd.

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Other Title
  • Al薄膜形成，加熱，焼入れおよび窒化によるSKD61ダイス鋼の表面改質
  • Al ハクマク ケイセイ カネツ ヤキイレ オヨビ チッカ ニ ヨル SKD61 ダイス コウ ノ ヒョウメン カイシツ

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Abstract

The surface modification of SKD61 die steel has been studied by a complex process consisting of, at first, physical vapor deposition of an Al thin film from 0.6 to 4.4 μm (step 1), diffusional dilution of the film into the matrix under vacuum heating at 1298 K for 1.8 ks (step 2), gas quenching (step 3), and plasma-nitriding at 813 K or 853 K for 14.4 ks (step 4) at last.<BR>The results for the steps from 1 to 3 are as follows. (1) The thickness of the Al-diffused layer increases with the thickness of the Al thin film. The Al content at the most outer surface also increases with the thickness of the Al thin film. (2) The Al-diffused layer shows the hardness of about HV270, and the matrix shows the hardness of about HV610 corresponding to the die steel quenched. (3) The previously reported model for treating multiphase diffusion during the process of homogenization for diffusion couples has been applied to this Al thin film/die steel couple. The numerically calculated profiles of Al content agree well with the experimentally obtained ones.<BR>The results for the steps from 1 to 4 are as follows. (4) The nitriding zone obtained consists of the Al-diffused nitriding layer, and the nitriding layer of the matrix. The total thickness of both the nitriding layers almost remains constant regardless of the thickness of the Al thin film. (5) The surface hardness of the Al-diffused nitriding steel slightly increases with the thickness of the Al thin film.

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