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Laser-deposited CoCrMo alloy: Microstructure, wear, and electrochemical properties

Published online by Cambridge University Press:  22 July 2014

Kedar M. Mantrala ,
Mitun Das ,
Vamsi K. Balla ,
Ch. Srinivasa Rao  and
V.V.S. Kesava Rao
Kedar M. Mantrala*
Affiliation:
Department of Mechanical Engineering, Vasireddy Venkatadri Institute of Technology, Guntur 522508, India
Mitun Das
Affiliation:
Bioceramics & Coating Division, CSIR-Central Glass and Ceramic Research Institute (CGCRI), Kolkata 700032, India
Vamsi K. Balla*
Affiliation:
Bioceramics & Coating Division, CSIR-Central Glass and Ceramic Research Institute (CGCRI), Kolkata 700032, India
Ch. Srinivasa Rao
Affiliation:
Department of Mechanical Engineering, Andhra University College of Engineering, Visakhapatnam 530003, India
V.V.S. Kesava Rao
Affiliation:
Department of Mechanical Engineering, Andhra University College of Engineering, Visakhapatnam 530003, India
*
b)e-mail: [email protected]
a)Address all correspondence to these authors. e-mail: [email protected]
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Abstract

CoCrMo alloy was deposited on a metallic substrate using laser engineered net shaping (LENS™) – a laser-based additive manufacturing technique. Several samples with five layers of deposit were fabricated at different combinations of laser power, powder feed rate, and scan velocity to study their influence using L4 Orthogonal array. The deposits were evaluated for their microstructure, hardness, wear resistance, and electrochemical performance. Grey relational grade analysis and analysis of variance were applied to identify optimum process parameters. The x-ray diffraction and microstructural analysis of the deposits showed uniform and fine microstructural features. Our experimental results revealed that the coatings fabricated using high laser power (350 W), low powder feed rate (5 g/min), and high scan velocity (20 mm/s) provide the highest hardness (446 ± 2.87 Hv) and wear resistance (1.80 ± 0.0007 mm3/Nm). However, the corrosion resistance was observed to be high for the deposits fabricated using low laser power (200 W), low powder feed rate (5 g/min), and low scan velocity (10 mm/s).

Keywords

laser engineered net shapingCoCrMoadditive manufacturingmicrostructurewearcorrosion
Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 17: Focus Issue: The Materials Science of Additive Manufacturing , 14 September 2014 , pp. 2021 - 2027
Copyright
Copyright © Materials Research Society 2014 

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