2019 Volume 105 Issue 6 Pages 648-654
In the dislocation characterization using radiation diffraction, the modified Williamson-Hall method gives the parameter α, φ and S, in which the information about crystallite size, dislocation density and screw component of dislocation are contained respectively. On the other hand, the direct-fitting method gives the parameter α, micro-strain ε and the correction parameter ωh00. In this study, the correlation in these parameters was investigated in cold rolled ferritic steel (Fe-0.0056%C). Results obtained are as follows: Almost same values were obtained for the parameter α in both methods. The value of parameter ε increases as the S-value becomes small even under the same dislocation density. At the constant S-value, however, linear relationship was found between ε and φ. Between the parameter S and ωh00, there is an identical relationship expressed by the equation; S=1.16+1.46ωh00–3.71ωh002 regardless of dislocation density. In addition, it was confirmed that there is no large effect of texture on the dislocation characterization by the direct-fitting method and the modified Williamson-Hall method.
