Comparison of Synchrotron Radiation Diffraction and Micromagnetic Stress Analysis in Straightened Steel Pipes

Sascha Raatz; Michael Kaack; Peter Staron; Norbert Schell; Andreas Schreyer; Manuela Klaus; Christoph Genzel; Katharina Theis-Bröhl

doi:10.4028/www.scientific.net/MSF.777.225

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HomeMaterials Science ForumMaterials Science Forum Vol. 777Comparison of Synchrotron Radiation Diffraction...

Comparison of Synchrotron Radiation Diffraction and Micromagnetic Stress Analysis in Straightened Steel Pipes

Abstract:

The use of magnetic Barkhausen noise (MBN) and harmonic analysis (HA) as non-destructiveevaluation (NDE) techniques in the industrial environment increased in the last years. In our study,we evaluated the potential of those methods to measure residual stress on the surface of straightenedsteel pipes. To study the influence of the pipe manufacturing process and the following straighteningprocess we used pipes of three different straightening levels. The straightening was done with differentparameters, which resulted in a plastic deformation that leaves a visible helix on the surface of thepipes. High energy diffraction experiments were performed to obtain absolute values of residual stresson the surface and in the bulk of the pipe samples. With these residual stress values our MBN and HAdata was calibrated. The surface of all pipes showed high compressive stresses while the highest tensilestresses were 0.5 to 1.4 mm under the surface. The stresses correlate to greater plastic deformationduring the straightening process.

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Materials Science Forum (Volume 777)

Pages:

225-230

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.777.225

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Online since:

February 2014

Authors:

Sascha Raatz, Michael Kaack, Peter Staron, Norbert Schell, Andreas Schreyer, Manuela Klaus, Christoph Genzel, Katharina Theis-Bröhl

Keywords:

High-Energy X-Ray Diffraction, Magnetic Barkhausen Noise (MBN), Pipe Straightening, Residual Stress

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