Quadratic Model for Predicting the Hardness of Heat Affected Zone in Water Cooled Cast Iron Weldment In Relation to Similarly Cooled Aluminum and Mild Steel Weldments

C. I.  Nwoye

doi:10.4236/jmmce.2009.810066

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JMMCE Vol.8 No.10 , October 2009

Quadratic Model for Predicting the Hardness of Heat Affected Zone in Water Cooled Cast Iron Weldment In Relation to Similarly Cooled Aluminum and Mild Steel Weldments

C. I. Nwoye^*

Abstract: Quadratic and linear models have been derived for predicting the heat-affected zone (HAZ) hardness of water cooled cast iron weldment in relation to the combined and respective values of the heat-affected zone hardness of aluminum and mild steel welded and cooled under the same conditions. It was found that the validity of the model is rooted on the fractional expression; γ/3.0749θ + γ/3.0749β + θ/3.0749β = 1. The respective deviations of the model-predicted heataffected zone hardness values of aluminum, cast iron and mild steel from the corresponding experimental values were less than 0.01% which is quite insignificant, indicating reliability of the model.

Keywords: Model, Hardness, Heat Affected Zone, Cast Iron Weldments, Aluminum, Mild Steel.

Cite this paper: C. Nwoye, "Quadratic Model for Predicting the Hardness of Heat Affected Zone in Water Cooled Cast Iron Weldment In Relation to Similarly Cooled Aluminum and Mild Steel Weldments," Journal of Minerals and Materials Characterization and Engineering, Vol. 8 No. 10, 2009, pp. 765-773. doi: 10.4236/jmmce.2009.810066.

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