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Hollomon-Jaffe-Parameter

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The Hollomon Parameter HP describes the effect of a heat treatment by isothermal holding at a temperature for a certain time. The effect of the heat treatment depends on its temperature and its time. You can achieve the same effect with a low temperature and a long holding time or with a higher temperature and a short holding time. This exchangability of time and temperature can be described by the following formula:

<math>H_p = \frac {(273,15 + T)}{1000} \cdot (C + log(t)) </math>

This formula is not consistent concerning the units. That means that you have to enter the parameters in a certain manner. The argument of the logarithmic function has the unit minutes. The Hollomon parameter itself is unitless and realistic numeric values vary between 15 and 21.de:Hollomon-Jaffe-Parameter

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