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Abstract:
TEM has been used to investigate the microstructures of the surface
layer formed on 40Cr steel by nitrogen ion implantation. Different
microstructures at various depths have been observed. In the outermost
layer and subjacent layer, the ferrite grains have been refined, the
nitrides α″-Fe16N20 γ′-Fe4N, ε-Fe3,3 (C. N) have precipitated and carbides
Fe3C disappeared, while in the transition layer adjacent to matrix, the
microstructure consists of a dispersion of tiny Fe10N2 precipices in the
perfect ferrite matrix. The process of ferrite grains subdivided into
ultra-fine grains and disappearance of retained carbides, formation of
disperse nitrides were discussed qualitatively.
Key words:
铬钢 离子注入 显微组织
中科院上海冶金研究所离子束开放研究实验资助项目. Received 198812,
received in revised form 199003
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