TITLE:
Optimizing the Conditions for Residual Stress Measurement Using a Two-Dimensional XRD Method with Specimen Oscillation
AUTHORS:
Osamu Takakuwa, Hitoshi Soyama
KEYWORDS:
Two-Dimensional XRD; Diffraction Ring; Oscillation; Residual Stress; Stainless Steel
JOURNAL NAME:
Advances in Materials Physics and Chemistry,
Vol.3 No.1A,
April
26,
2013
ABSTRACT:
In order to optimize the conditions for residual stress measurement using a two-dimensional X-ray
diffraction (2D-XRD) in terms of both efficiency and accuracy. The
measurements have been conducted on three stainless steel specimens in this
study. The three specimens were processed by annealing, a cavitating jet in air
and a disc grinder, with each method introducing different residual stresses at
the surface. The specimens were oscillated in the ω-direction, representing a right-hand rotation of the specimen
about the incident X-ray beam. The range of the oscillation, Δω, was varied
and optimum Δω was determined.
Moreover, combinations of the tilt angle between the specimen surface normal
and the diffraction vector, ψ, with
the rotation angle about its surface normal, f, have been studied with a view to find the most optimum condition.
The results show that the use of ω oscillations is an effective method for improving analysis accuracy,
especially for large grain metals. The standard error rapidly decreased with
increasing range of the ω oscillation, especially for the annealed specimen which generated strong
diffraction spots due to its large grain size.