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Surface nitriding of commercially pure (CP) titanium was carried out using high power CO2laser at pure nitrogen and dilute nitrogen (N2+ Ar) environment. The hardness, microstructure, and melt pool configuration of the laser melted titanium in helium and argon atmosphere was compared with laser melting at pure and dilute nitrogen environment. The hardness of the nitrided layer was of the order of 1000 to 1600 HV. The hardness of the laser melted titanium in the argon and helium atmosphere was 500 to 1000 HV. Using x-ray analysis the formation of TiN and Ti...
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