Titanium alloys are gaining widespread acceptance in aerospace industry because of its high specific strength, corrosion resistance and good fatigue properties. Dovetails of the compressor blades, gears, splines etc. are some aerospace components that fail through premature fatigue crack initiation and propagation under the action of wear, fatigue and fretting fatigue. The fretting failure originates from the surface or near surface and leads to the damage of the components. Therefore the surface of components can be modified to improve the tribological performance by plasma nitriding which improve the titanium alloy by forming layer of hard TiN and Ti2N phases on surface. Plasma nitriding of titanium alloys has several advantages over gas and liquid nitriding methods where the phase formation and the depth of nitriding can be controlled. In this study Ti-6Al-4V alloy is taken as surrogate material for gas turbine application and its surface is modified by plasma nitriding at three different temperatures 500, 700 and 800 °C with N2:H2 ratio of 4:1 at 5 mbar pressure for 5 hrs. It is observed from XRD that at 500 and 700 °C temperature, nucleation of ε-Ti2N and δ-TiN started and complete titanium nitride layer formed at 800 °C. Nucleation and growth mechanism was studied by surface and cross section SEM analysis. Nitride layer of around 0.5 μm with ε-Ti2N and around 2 μm thick of both ε-Ti2N and δ-TiN phases were formed at 700 and 800 °C respectively. It is observed that the surface roughness increases with increasing the temperature for plasma nitriding. Vickers microhardness (HV0.1) is observed to be increased from 393.7 HV to 1016.4 HV by plasma nitriding at 800 °C.
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ASME 2017 Gas Turbine India Conference
December 7–8, 2017
Bangalore, India
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-5851-6
PROCEEDINGS PAPER
Characterization of Ti-6Al-4V Alloy Modified by Plasma Nitriding Process
Vaibhav N. Bhavsar,
Vaibhav N. Bhavsar
Indian Institute of Technology Bombay, Bombay, India
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Jyoti Shankar Jha,
Jyoti Shankar Jha
Indian Institute of Technology Bombay, Bombay, India
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Ghanshyamsinh Jhala,
Ghanshyamsinh Jhala
Institute for Plasma Research, Gandhinagar, India
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Alphonsa Joseph,
Alphonsa Joseph
Institute for Plasma Research, Gandhinagar, India
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Sushil Mishra,
Sushil Mishra
Indian Institute of Technology Bombay, Bombay, India
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Asim Tewari
Asim Tewari
Indian Institute of Technology Bombay, Bombay, India
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Vaibhav N. Bhavsar
Indian Institute of Technology Bombay, Bombay, India
Jyoti Shankar Jha
Indian Institute of Technology Bombay, Bombay, India
Ghanshyamsinh Jhala
Institute for Plasma Research, Gandhinagar, India
Alphonsa Joseph
Institute for Plasma Research, Gandhinagar, India
Sushil Mishra
Indian Institute of Technology Bombay, Bombay, India
Asim Tewari
Indian Institute of Technology Bombay, Bombay, India
Paper No:
GTINDIA2017-4855, V002T10A008; 5 pages
Published Online:
February 2, 2018
Citation
Bhavsar, VN, Jha, JS, Jhala, G, Joseph, A, Mishra, S, & Tewari, A. "Characterization of Ti-6Al-4V Alloy Modified by Plasma Nitriding Process." Proceedings of the ASME 2017 Gas Turbine India Conference. Volume 2: Structures and Dynamics; Renewable Energy (Solar, Wind); Inlets and Exhausts; Emerging Technologies (Hybrid Electric Propulsion, UAV,..); GT Operation and Maintenance; Materials and Manufacturing (Including Coatings, Composites, CMCs, Additive Manufacturing); Analytics and Digital Solutions for Gas Turbines/Rotating Machinery. Bangalore, India. December 7–8, 2017. V002T10A008. ASME. https://doi.org/10.1115/GTINDIA2017-4855
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