Abstract
The following equation has been proposed by Orowan to describe the relation among creep rate, \dotγc, work-hardening rate, h, and recovery rate, r.
\dotγc=r⁄h
Many researchers have shown that this relation holds in high temperature creep using experimental values obtained by various methods proposed to measure the values of h and r.
The purpose of this paper is to check by means of theoretical calculations whether or not the true values of h and r are obtained by the methods so far proposed. Two cases, namely, the case of quasi-viscous dislocation motion and that of free flight dislocation motion were chosen as typical examples of the calculation.
Main results obtained are as follows: (1) In the case of quasi-viscous dislocation motion some of the methods so far proposed are not suited to obtain the true values of h and r and others only give h and r containing a fairly large margin of errors. (2) In the case of free flight dislocation motion, true values can be obtained by most of the proposed methods and they satisfy the above equation proposed by Orowan. (3) The experimental values reported by other authors indicate that the calculated values of h and r for the case of free flight dislocation motion are reasonable.
