Heat Affected Zone Hardness (HAZH) Equivalence of Mild Steel Weldments Cooled in Air Based on Its HAZH in Different Media

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Year:
2014
Type of Publication:
Article
Keywords:
Heat Affected Zone Hardness Equvalence, Mild Steel, Air Cooling Weldments
Authors:
C. I. Nwoye; E. M. Ameh; A. O. Agbo; P. O. Offor; C. C. Nwogbu
Journal:
IJSIM
Volume:
2
Number:
2
Pages:
192-197
Month:
March
Abstract:
This paper presents the evaluation of the heat affected zone hardness (HAZH) equivalence of mild steel weldments cooled in air based on its HAZH in different media. An empirical model was derived for evaluating the hardness of HAZ in mild steel weldment cooled in any of; groundnut oil, kerosine, palm oil, air, and water has been derived. The model; 4γ = 0.92β + 0.92φ + 0.94θ + 0.84α predicted directly HAZ hardness values γ, β, φ, θ, and α. Their respective deviations from the corresponding experimental values were found to be less than 1.6% which is quite insignificant and within the acceptable range of deviation limit from experimental results. The coefficient associated with each HAZ hardness value (β, φ, θ, and α) was found to be the numerical equivalent of the microstructural resistance to the hardening of the HAZ during cooling and are generally expressed as Coefficient of Hardness or Hardenability Factor. These coefficients were found to have inverse relationship with the associated HAZ hardness values along the model equation.

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