General expression of the Zener-Hollomon parameter as a function of the chemical composition of low alloy and microalloyed steels
- Centro Nacional de Investigaciones Metalurgicas, Madrid (Spain)
- Univ. Autonoma de Mexico, Mexico City (Mexico). Facultad de Quimica D
Using torsion tests the Zener-Hollomon parameter has been determined in a selection of 18 steels with compositions appropriate for the study of the influence of each alloying element (C, Mn, Si, Mo, Ti, V, Nb) on the Zener-Hollomon parameter ({dot {epsilon}} exp(Q/RT) = A(sinh {alpha}{sigma}{sub p}){sup n}). It is demonstrated that all the alloying elements influence to a greater or lesser extent, the activation energy (Q). A rise in the content of any alloy was found to increase the activation energy, except in the case of carbon which has the opposite effect. An expression is given for Q as a function of the content of each alloying element and the second side of the equation is completed by determining the optimum values of {alpha} and n for all the steels, giving 0.01187 MPa{sup {minus}1} and 4.458, respectively. It is demonstrated that A is not a constant but is a function of the activation energy. In this way it is possible to calculate the peak stress ({sigma}{sub p}) at any temperature and strain rate for any low alloy or microalloyed steel in the austenite phase. This study brings a new dimension to the Zener-Hollomon parameter and potentially improves its applications, for example in the calculation of stress-strain curves.
- OSTI ID:
- 271699
- Journal Information:
- Acta Materialia, Vol. 44, Issue 1; Other Information: PBD: Jan 1996
- Country of Publication:
- United States
- Language:
- English
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