Creation of precipitation hardened surface ceramics layer aiming to develop innovative steels with high wear resistance

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In order to create surface ceramics layer hardened by nano-sized precipitate, pure Fe and Fe-M binary alloys containing small amount of nitride forming elements were gaseous nitrided and crystal structure, growth rate and hardness of surface layer wereinvestigated. Nano-indentation measurements revealed that hardness of γ' layer on the surface of pure Fe is much higher than those in ferrite matrix beneath γ'. On the other hand, hardness of ferrite after nitriding treatment is significantly increased by the addition of Cr, V or Al, while alloying effect on hardness of compound layer is relatively small. Those results imply that precipitation hardening by nano-sized nitrides is not so effective to harden the compound layer.