General expression of the Zener-Hollomon parameter as a function of the chemical composition of low alloy and microalloyed steels

Journal Article · Mon Jan 01 04:00:00 EST 1996 · Acta Materialia

DOI:https://doi.org/10.1016/1359-6454(95)00151-0· OSTI ID:271699

Medina, S F ^[1]; Hernandez, C A ^[2]

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1. Centro Nacional de Investigaciones Metalurgicas, Madrid (Spain)
2. 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, Journal Name: Acta Materialia Journal Issue: 1 Vol. 44; ISSN XZ504Y; ISSN 1359-6454
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ACTIVATION ENERGY
CARBON
DEFORMATION
LOW ALLOY STEELS
MANGANESE
MOLYBDENUM
NIOBIUM
NUMERICAL ANALYSIS
SILICON
STRAIN RATE
STRAINS
STRESSES
TEMPERATURE DEPENDENCE
TITANIUM
TORSION
VANADIUM