JSEMAT  Vol.2 No.4 , October 2012
Mechanism of Building-Up Deposited Layer during Electro-Spark Deposition
ABSTRACT
This paper studies the mechanism of formation of the deposit layer by (ESD) electro-spark deposition process. Inconel 738 substrates are coated with a deposited layer of NI6625 (Inconel 625). Selections of these two alloys have been done because they had wide applications and importance in the industry especially in gas turban blades in inland stations and in aircraft engines. ESD is suggested because it has a low input heat process which eliminates the effect of HAZ in these Ni-superfluous due to their sustainability to micro-cracks. The coating contains many deposited sub-layers coming from evaporated and melted micro-regions as a result of locally high heat generated by discharging a series of capacitors charged and discharged in a controlled manner between electrode and substrate material. The maximum deposition rates at the beginning of the process and decreases until been in a steady state condition due to the nature of the resultant morphology of the created surface.

Cite this paper
A. Thamer, M. Hafiz and B. Mahdi, "Mechanism of Building-Up Deposited Layer during Electro-Spark Deposition," Journal of Surface Engineered Materials and Advanced Technology, Vol. 2 No. 4, 2012, pp. 258-263. doi: 10.4236/jsemat.2012.24039.
References
[1]   U.S. Department of Defense, “Electrospark Deposition for Depot- and Field-Level Component Repair and Replacement of Hard Chromium Plating,” Environmental Security Technology Certification Program (ESTCP), Alexandria, 2006.

[2]   A. Thakur, N. L. Richards and M. C. Chaturvedi, “On Crack-Free Welding of Cast Inconel 738,” International Journal for the Joining of Materials, Vol. 15, No. 4, 2003, pp. 21-25.

[3]   K. Banerjee, N. L. Richards and M. C. Chaturvedi, “Effect of Filler Alloys on HAZ Cracking in Pre-Weld Heat Treated IN-738 LC GTA Welds, Metallurgical and Materials Transactions A, Vol. 36, No. 7, 2005, pp. 1881- 1890.

[4]   J. Durocher and N. L. Richards, “Evaluation of the Low Heat Input Process for Weld Repair of Nickel-Base Superalloys,” Journal of Materials Engineering and Performance, Vol. 20, No. 7, 2011, pp. 1294-1303.

[5]   R. C. Reed, “The Superalloys Fundamentals and Applications,” Cambridge University Press, Cambridge, 2006, p. 23.

 
 
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