JMMCE  Vol.9 No.3 , March 2010
Studies on Weldability of Powder-Processed Fe-0.35P-0.15C Alloy Using Gas Tungsten Arc Welding Process
ABSTRACT
The objective of this study was to investigate the weldability of an iron-based powder metal alloy (Fe-P-C) using the gas tungsten arc welding process (GTAW) with two different filler metals. Optical microscopy revealed that for the Fe-P-C alloys, the fusion-welded zone was free of porosity and cracks. The thickness of the slab was 4 mm. The heat affected zone did not show excessive hardness. The SEM image of the fracture specimen showed elongated dimples. X-Ray mapping confirmed the absence of Fe3P. EPMA was used to determine the ability of carbon in preventing the segregation of P to the grain boundaries. Tensile tests showed that the failures of the specimens occurred always in the base metal with tensile strength slightly superior to the value of unwelded samples. As a result, this investigation showed the feasibility of joining ironbased powder metal alloys by the GTAW process, especially while welding the Fe-P-C alloy.

Cite this paper
Y. Mehta, S. Trivedi, K. Chandra and P. Mishra, "Studies on Weldability of Powder-Processed Fe-0.35P-0.15C Alloy Using Gas Tungsten Arc Welding Process," Journal of Minerals and Materials Characterization and Engineering, Vol. 9 No. 3, 2010, pp. 211-229. doi: 10.4236/jmmce.2010.93018.
References
[1]   N. Chawla, X. Deng, Mater. Sci. Eng. Vol. 390 (2005) 98.

[2]   K.V. Sudhakar, P. Sampathkumaran, E.S. Dwarakadasa, Wear Vol. 242, (2000) 207.

[3]   J.A. Hamill, Weld. J. Vol. 2, (1993) 37-45.

[4]   K. Jayabharat, M. Ashafaq, P. Venugopal, D.R.G., Achar, Mater. Sci. Eng. Vol. 454-455 (2007) 114.

[5]   A. Kurt, H. Ates, A. Durgutlu, K. Karacif, Weld. J. Vol. 83 (12), (2004) 34.

[6]   F. Thummler, R. Oberacker, Introduction to Powder Metallurgy. Institute of Materials, London 1993.

[7]   E.O. Correa, S.C. Costa, J.N. Santos, J. Mater. Process. Technol. Vol. 209 (2009) 3937.

[8]   J.F. Lancaster, Metallurgy of Welding, 4th ed. George Allen & Unwin, London (1987).

[9]   J.C. Lippold, D.J. Kotecki, Welding Metallurgy and Weldability of Stainless Steel, 5th ed. John Willey & Sons, USA (2005).

[10]   ASM Handbook, Metallography and Microstructures, Vol. 9 (1999).

[11]   A.N. Briskman, Aut. Weld. Vol. 32 (7) (1979)40.

[12]   O Kubaschewski, Iron—Binary phase diagrams (Berlin: Springer Verlag), (1982) 84

[13]   A. Bramley, F. W. Haywood, A. T. Coopers and J. T. Watts, Trans. Faraday Soc., Vol. 31 (1935)707

[14]   J. W. Stewart, J. A. Charles and E. R. Wallach, Mater. Sci.Technol. Vol. 16(3) (2000) 275.

[15]   R. Balasubramaniam and Gouthama, Bull. Mater. Sci., Vol. 26, No. 5, (2003) 483.

[16]   P. Lindskog, J. Tengzelius and S. A. Kvist, Modern Developments in Powder Metallurgy, Vol. 10, Ferrous and Nonferrous P/M Materials, (1977) 97.

[17]   H.Erhart and H. J. Grabke, Met. Sci. Vol. 15 issue 9 (1981) 401.

[18]   R. L. Sands and C. R. Shakespeare, Powder Metallurgy – Practice and applications, George Newnes Ltd. UK, (1966) 112

[19]   ASM Handbook, Heat Treating, Vol. 4 (1991).

[20]   E.O. Correa, S.C. Costa, J.N. Santos, J. Mater. Process. Technol. Vol. J. Mater. Process. Technol. Vol. 198 (2008) 323.

 
 
Top