粉末液相被覆法を用いたAl拡散浸透およびプラズマ窒化処理による炭素鋼および合金工具鋼の表面改質(エコマテリアルの開発)(Part-2. 鉄鋼業と循環型社会)(<特集>鉄の技術と文化および循環型社会)

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Powder liquid coatme^<1-5)> is applied as an aluminization technique for carbon steel (JIS S45C), and subsequent plasma nitriding for tool steel (SKD61) In this process, Fe_2Al_5 forms initially on S45C, and the intermetallic compound decomposes into α-Fe during heat treatment at 1273K, excluding C atoms from the aluminized layer (α-Fe) to the substrate (γ-Fe) Alummized layer of α-Fe including vanadium carbide particles is formed on SKD61 by heating at 1303K, and the substrate transforms into martensite during N_2 gas flow cooling after heat treatment By plasma nitriding of alummized SKD61, hardness of HV1200-1600 is achieved at previously aluminized layer, exhibiting no detectable aluminium nitride but Fe_3N, Fe_4N, and highly strained α-Fe matrix in its surface XRD Although the hardening mechanism of the modified layer is not clarified, it is suggested from XRD that the hardness is attributed to precipitation hardening by nitrides (ε-Fe_3N, γ'-Fe_4N) as well as solid solution hardening by Al
社団法人日本鉄鋼協会の論文
2005-01-01