Creep deformation in a modified 9Cr-1Mo steel  projection approach to prediction of creep properties

Authors: Eberle, N.; Jones, F. L.

Source: Materials Science and Technology, Volume 19, Number 2, February 2003 , pp. 214-218(5)

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Abstract:

The  projection concept has been developed by Evans and Wilshire in an attempt to use short term creep test data to predict long term behaviour. The analysis has been discussed as a three-stage procedure: (i) least squares curve fitting of the model equation to individual creep curves; (ii) mathematical description of the variations of the parameters in the model equation with test conditions; (iii) prediction of creep curves using the equations developed in stages (i) and (ii). When stages (i) and (ii) have been completed it should be possible to determine creep curves for any combination of test conditions if a suitable model equation is chosen and variation of the parameters in the model equation is sufficiently well characterised. Evans and Wilshire have used this methodology on a number of alloys and ceramics. In the present work the  projection concept has been applied to a modified 9Cr-1Mo steel, whose creep properties have been presented elsewhere. It is found that the general form and shape of the creep curves can be represented by the normal  projection equation, i.e. ε=₁(1-exp(-₂ t)) + ₃(exp(₄ t)-1), but that the temperature and stress dependencies of many of the parameters in the equation, and the strain to failure, are difficult to describe accurately, using equations similar to those proposed by Evans and Wilshire. Hence, while the prediction of short term creep properties was good, long term predictions were less impressive.

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Document Type: Regular Paper

DOI: http://dx.doi.org/10.1179/026708303225009427

Publication date: 2003-02-01

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Creep deformation in a modified 9Cr-1Mo steel  projection approach to prediction of creep properties

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