Hardness, microstructure and surface characterization of laser gas nitrided commercially pure titanium using high power CO{sub 2} laser
- Anna Univ., Chennai (India). Dept. of Physics
- Center for Advanced Technology, Madya Pradesh (India)
- DMRL, Hyderabad (India)
- Indira Gandhi Centre for Atomic Research, Tamil Nadu (India). Materials Science Div.
Surface nitriding of commercially pure (CP) titanium was carried out using high power CO{sub 2} laser at pure nitrogen and dilute nitrogen (N{sub 2} + 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 of the formation of TiN and Ti{sub 2}N phase was identified in the laser nitrided titanium. The presence of nitrogen in the nitrided zone was confirmed using secondary ion mass spectroscopy (SIMS) analysis. The microstructures revealed densely populated dendrites in the sample nitrided at 100% N{sub 2} environment and thinly populated dendrites in dilute environment. The crack intensity was large in the nitrided sample at pure nitrogen, and few cracks were observed in the 50% N{sub 2} + 50% Ar environment.
- OSTI ID:
- 669812
- Journal Information:
- Journal of Materials Engineering and Performance, Vol. 7, Issue 5; Other Information: PBD: Oct 1998
- Country of Publication:
- United States
- Language:
- English
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