Abstract—The objective of this research is to develop a cobalt-free electrode deposition procedure for crack-free multilayer hardfacing of low carbon steel base material for slurry pump components. Chromium carbide based tubular Cobalarc hardfacing electrode (Hardfacing layer) and manganese-based austenitic Duromangan buffer electrode (Buffer layer) were selected for replacing conventional radioactive cobalt-based hardfacing electrodes like Stellite-1. The 13mm thick multilayer hardfaced material (5mm thick base material) showed minimum 60 HRC hardness and wear properties comparable to high chromium steel material (30mm thickness) currently being used for slurry pump components. The multilayer hardfacing without preheating on low carbon steel base material < 15mm thickness is restricted to two hardfacing layers, as triple or more layers result in crack formation due to welding contraction strain. For low carbon steel base material ≥ 15mm thickness and for laying a third hardfacing layer on low carbon steel base material < 15mm thickness, preheating of base material to 200℃ is required prior to hardfacing to prevent crack formation. FEA using Ansys birth and death technique has been used to establish the preheating requirement.
Index Terms—Birth and death, buffer layer, cobalarc, multilayer hardfacing.
V. T. Bhanu Kiran is with Doosan Power Systems India Pvt. Ltd., Gurgaon, Haryana, India (e-mail: bhanu. kiran@ doosan.com).
M. Krishna, J. R. Natraj, and Satish Kumar are with the Department of Mechanical Engineering, R V College of Engineering, Bangalore, Karnataka, India (e-mail: krishna_phd@ yahoo.co.in, natarajjr@rvce.edu.in, sathish1003@gmail.com).
Cite: V. T. Bhanu Kiran, M. Krishna, J. R. Natraj, and Satish Kumar, "Development and Characterization of a Electrode Deposition Procedure for Crack-Free Hard facing of Low Carbon Steel," International Journal of Engineering and Technology vol. 4, no. 1, pp. 18-25, 2012.
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