Journal of Emerging Trends in Engineering and Applied Sciences: Research Areas

Article Title: Postcooling Treatment Impact on Mechanical Properties of Welded Hadfield Steel Pieces
by E. Curiel- Reyna. I. Rojas-Rodriguez, J. Teran, A. Del Real, A. Lara-Guevara, and M. E. Rodriguez-Garcia

Abstract:
Mechanical properties at the heat affected zone of welded Hadfield steel were studied as a result of different options of post cooling. Samples were postcooled in furnace, at room temperature and in mineral oil. The heat temperature, the cooling rate and the postcooling process affected the metallurgical microstructure, and consequently, mechanical properties as tensile strength, yield strength, strain and microhardness. Mechanical properties changed dramatically when welded Hadfield steel specimens were postcooled at different conditions. Discontinuities at the grain boundary of the heat affected zone normally weaken parts under stress or cyclic loads. Results were compared among three postcooling methods after welding and no welded samples in order to evaluate mechanical properties between the new Hadfield steel and pieces that were repaired by welding. According to the results, in terms of one manufacturing process, Hadfield steel parts are not recommendable to reduce the HAZ effect in neither case of postcooling conditions that were tested. The welding process produced heat retention, and consequently, metallurgical changes in detriment of the Hadfield steel mechanical properties. Mechanical properties showed significant differences among the different postcooling options of this study as a result of the metallurgical changes

Keywords: carbides, postcooling, fracture, Hadfield steel, mechanical properties, welding repair.

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