Kendall tau rank correlation coefficient: Difference between revisions
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The '''Hollomon–Jaffe parameter''', or '''HP''', describes the effect of a [[heat treatment]] at a [[temperature]] for a certain time.<ref Name="Brooks">{{cite book | |||
|title=Principles of the heat treatment of plain carbon and low alloy steels | |||
|last=Brooks | |||
|first=Charlie | |||
|authorlink=Charlie R. Brooks | |||
|year=1996 | |||
|publisher=ASM International | |||
|isbn=0871705389 | |||
|page=158 | |||
|url=http://books.google.com/books?id=fVIlbCFTodgC&pg=PA158&dq=%22Hollomon-Jaffe+parameter%22&hl=en&ei=MM_STNDEGsOblgeJ4M3vDQ&sa=X&oi=book_result&ct=result&resnum=2&ved=0CCwQ6AEwAQ#v=onepage&q=%22Hollomon-Jaffe%20parameter%22&f=false }}</ref> | |||
==Effect== | |||
The effect of the heat treatment depends on its temperature and its [[time]]. The same effect can be achieved with a low temperature and a long holding time, or with a higher temperature and a short holding time. | |||
==Formula== | |||
In the Hollomon–Jaffe parameter, This exchangeability 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; the parameters must be entered in a certain manner. ''T'' is in degrees Celsius. The argument of the [[Logarithm|logarithmic function]] has the unit [[hour]]s. ''C'' is a parameter unique to the material used. The Hollomon parameter itself is [[Dimensionless quantity|unitless]] and realistic numeric values vary between 15 and 21. | |||
:<math>H_p = T (C + \log(t)) \,</math> | |||
where ''T'' is in [[kilokelvin]]s, ''t'' is in hours, and ''C'' is the same as above. | |||
==See also== | |||
* [[Zener–Hollomon parameter]] | |||
==References== | |||
{{reflist}} | |||
{{DEFAULTSORT:Hollomon-Jaffe Parameter}} | |||
[[Category:Metal heat treatments]] | |||
[[hu:Hollomon–Jaffe-paraméter]] | |||
Revision as of 18:51, 8 August 2013
The Hollomon–Jaffe parameter, or HP, describes the effect of a heat treatment at a temperature for a certain time.[1]
Effect
The effect of the heat treatment depends on its temperature and its time. The same effect can be achieved with a low temperature and a long holding time, or with a higher temperature and a short holding time.
Formula
In the Hollomon–Jaffe parameter, This exchangeability of time and temperature can be described by the following formula:
This formula is not consistent concerning the units; the parameters must be entered in a certain manner. T is in degrees Celsius. The argument of the logarithmic function has the unit hours. C is a parameter unique to the material used. The Hollomon parameter itself is unitless and realistic numeric values vary between 15 and 21.
where T is in kilokelvins, t is in hours, and C is the same as above.
See also
References
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