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Residual Stresses in Shot Peened Grey and Compact Iron*

  • M. Lundberg , R. L. Peng , M. Ahmad , T. Vuoristo , D. Bäckström and S. Johansson
Published/Copyright: March 3, 2014
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HTM Journal of Heat Treatment and Materials
From the journal HTM Journal of Heat Treatment and Materials Volume 69 Issue 1

Abstract

Grey cast iron and compacted graphite iron with a pearlitic matrix are investigated in this study after shot peening using twelve unique combinations of parameters, namely shot size, peening intensity and coverage, followed by residual stress measurements and evaluations. Cylindrical test samples were cut out from heavy truck cylinder heads and polished on the top flat surface to decrease effects from cutting. Residual stresses and the affected depth from the different peening conditions varied between −245 MPa to −565 MPa and from 280 μm to 770 μm in depth. Resultant surface compressive stresses decrease with increasing shot size, peening intensity or coverage whereas the affected depth increases with increasing intensity. The increased affected depth is a result from the increased extent and magnitude of plastic deformation. The compacted graphite iron was more affected by shot peening than the grey cast iron, meaning that the same shot peening parameters resulted in both higher compressive stresses and larger deformation depth.

Kurzfassung

In dieser Arbeit werden die Eigenschaften von Grauguss und Vermiculargraphitguss mit einer perlitischen Matrix nach zwölf unterschiedlichen Kugelstrahlbehandlungen untersucht. Hierfür wurden Parametervariationen von Kugelgröße, Strahlintensität und Deckungsgrad eingestellt. Anschließend wurden Eigenspannungen gemessen und ausgewertet. Die zylindrischen Testkörper wurden aus Zylinderköpfen von Schwerlastern entnommen und an der Stirnseite poliert, um den Einfluss des Schneideprozesses zu reduzieren. Ausmaß und Einwirkungstiefe der eingebrachten Eigenspannungen reichen von −245 MPa bis −565 MPa bzw. von 280 μm bis 770 μm. Die oberflächlichen Druckeigenspannungen sinken mit größerer Strahlkugelgröße, Strahlintensität oder größerem Deckungsgrad, während sich die Einwirkungstiefe mit steigender Strahlintensität erhöht. Dies rührt von der erhöhten plastischen Verformung her. Dabei ist der Einfluss auf den Vermiculargraphitguss größer als auf den Grauguss, d. h. bei derselben Kugelstrahlbehandlung erzielt man größere Druckeigenspannnungen und eine höhere Einwirkungstiefe.

Keywords: Residual stress; FWHM; cast iron; shot peening; X-ray diffraction
Schlüsselwörter: Eigenspannungen; Halbwertsbreite; Gusseisen; Kugelstrahlen; Röntgenbeugung
4
*

Enhanced contribution based upon a presentation at the International Conference on Residual Stresses ICRS9, October 7–9, 2012, in Garmisch-Partenkirchen, Germany

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Published Online: 2014-03-03
Published in Print: 2014-02-27

© 2014, Carl Hanser Verlag, München

Articles in the same Issue

  1. Veranstaltungen/Events
  2. Veranstaltungen in Zusammenarbeit mit der AWT
  3. HTM-Praxis
  4. HTM-Praxis
  5. Inhalt/Contents
  6. Inhalt
  7. Kurzfassungen/Abstracts
  8. Kurzfassungen
  9. Editorial
  10. Neues Volltext-Archiv im Internet
  11. Fachbeiträge/Technical Contributions
  12. Welding Residual Stress Behavior in Tubular Steel Joints under Multiaxial Loading*
  13. Residual Stresses and Fatigue Behavior of High Strength Structural Steels with Fillet Welded Longitudinal Stiffeners*
  14. Untersuchung des inhomogenen plastischen Verformungszustands geschweißter Aluminiumlegierungen unter Verwendung von Beugungsmethoden*
  15. Laser Beam Material Removal from Carbide Cutting Tools*
  16. Residual Stresses in Shot Peened Grey and Compact Iron*
  17. Residual Stresses in High Speed Turning of Nickel-Based Superalloy*
  18. In Situ Structural Evolution of Steel-Based MMC by High Energy X-Ray Diffraction and Comparison with Micromechanical Approach*
https://doi.org/10.3139/105.110207
Keywords for this article
Residual stress; FWHM; cast iron; shot peening; X-ray diffraction

Articles in the same Issue

  1. Veranstaltungen/Events
  2. Veranstaltungen in Zusammenarbeit mit der AWT
  3. HTM-Praxis
  4. HTM-Praxis
  5. Inhalt/Contents
  6. Inhalt
  7. Kurzfassungen/Abstracts
  8. Kurzfassungen
  9. Editorial
  10. Neues Volltext-Archiv im Internet
  11. Fachbeiträge/Technical Contributions
  12. Welding Residual Stress Behavior in Tubular Steel Joints under Multiaxial Loading*
  13. Residual Stresses and Fatigue Behavior of High Strength Structural Steels with Fillet Welded Longitudinal Stiffeners*
  14. Untersuchung des inhomogenen plastischen Verformungszustands geschweißter Aluminiumlegierungen unter Verwendung von Beugungsmethoden*
  15. Laser Beam Material Removal from Carbide Cutting Tools*
  16. Residual Stresses in Shot Peened Grey and Compact Iron*
  17. Residual Stresses in High Speed Turning of Nickel-Based Superalloy*
  18. In Situ Structural Evolution of Steel-Based MMC by High Energy X-Ray Diffraction and Comparison with Micromechanical Approach*
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