Startseite Effect of cooling rate on microstructure, mechanical properties and residual stress of 7075 aluminum alloy
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Effect of cooling rate on microstructure, mechanical properties and residual stress of 7075 aluminum alloy

  • Funda Gül Koç , Mustafa Çöl und Tanju Çeliker
Veröffentlicht/Copyright: 26. September 2018
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Materials Testing
Aus der Zeitschrift Materials Testing Band 60 Heft 10

Abstract

In this study, the effect of cooling rate on microstructure, mechanical properties and residual stress of 7075 aluminum alloy was investigated. The influence of cooling rate on microstructure, hardness, electrical conductivity of 7075 aluminum alloy was investigated using a Jominy end quench test. Water at three different temperatures (20 °C, 50 °C, 75 °C) and polymer solutions of varied concentrations (5vol.-% and 25vol.-%) were used as a quenching medium. The changes of hardness, electrical conductivity and microstructure properties of the specimens with an increase in distance from the quenched surface were investigated comparatively for different quenching mediums. Tensile tests were applied to determine the effect of the quenching rate on mechanical properties of the specimens. Residual stress was measured using the ESPI hole drilling technique to understand the influence of cooling rate. The results show that the cooling rate decreases as the distance from the quenched surface, water temperature and polymer concentration increases. The changes in material properties such as hardness, electrical conductivity along the material profile decrease as water temperature and polymer concentration increase. Although the hardness and mechanical properties of the material decrease as the cooling rate decreases, the values obtained are convenient for conditions of industrial usage. Residual stress was significantly eliminated by quenching in hot water or polymer solution at a high concentration.

Kurzfassung

In der diesem Beitrag zugrunde liegenden Studie wurden die Auswirkungen der Abkühlgeschwindigkeit auf das Gefüge, die mechanischen Eigenschaften und die Eigenspannungen einer Aluminiumlegierung 7075 untersucht. Der Einfluss der Abkühlrate auf das Gefüge, die Härte und die elektrische Leitfähigkeit der Aluminiumlegierung 7075 wurden mittels des Jominy-Versuches ermittelt. Als Abschreckmedium wurde Wasser mit der Temperatur 20, 50 und 75 °C sowie Polymerlösungen mit einer Konzentration von 5 % und 25 % verwandt. Zusätzlich wurden Zugversuche durchgeführt, um den Einfluss der Abschreckgeschwindigkeit auf die mechanischen Eigenschaften der Proben zu bestimmen. Die Eigenspannungen wurden mit dem ESPI-Bohrlochverfahren ermittelt. Die Ergebnisse zeigen, dass die Abkühlgeschwindigkeit mit zunehmendem Abstand von der abgeschreckten Oberfläche abnimmt und wenn die Wassertemperatur und die Polymerkonzentration zunehmen. Die Veränderungen der Materialeigenschaften, wie der Härte, der elektrischen Leitfähigkeit entlang der Probenform nehmen mit zunehmender Wassertemperatur und Polymerkonzentration ebenfalls ab. Wenngleich die Härte und die mechanischen Eigenschaften mit abnehmender Abkühlgeschwindigkeit abnehmen, erwiesen sich die ermittelten Werte für die industrielle Anwendung als geeignet. Die Eigenspannungen nahmen signifikant beim Abkühlen in heißem Wasser und in der hochkonzentrierten Polymerlösung ab.

*Correspondence Address, Funda Gül Koç, Department of Metallurgical and Materials Engineering, Faculty of Engineering, Kocaeli University, 41380, Kocaeli, Turkey, E-mail:

M.Sc. Funda Gül Koç, born in 1986, graduated from the Kocaeli University, Turkey, Department of Metallurgical and Materials Engineering in 2008. She received her M.Sc. degree from the Kocaeli University, in the same department. She has been working as a research assistant at the Department of Metallurgical and Materials Engineering, Kocaeli University, Turkey since 2009.

Assoc. Prof. Dr. Mustafa Çöl, born in 1962, received his M.Sc. and PhD degrees at the RWTH Aachen University, Germany. He has been working at the Department of Metallurgical and Materials Engineering, Kocaeli University, Turkey since 1995.

Dr. Tanju Çeliker, born in 1963, received his M.Sc. and PhD degrees from the RWTH Aachen University, Germany. He has been working as General Manager at Onat Profile and Alloys Industry in Kocaeli, Turkey since 1998.

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Published Online: 2018-09-26
Published in Print: 2018-10-27

© 2018, Carl Hanser Verlag, München

Artikel in diesem Heft

  1. Inhalt/Contents
  2. Contents
  3. Laudatio
  4. Professor Dr.-Ing. Harald Zenner: on the occasion of his eightieth birthday
  5. Fachbeiträge/Technical Contributions
  6. Fatigue life curve – A continuous Wöhler curve from LCF to VHCF
  7. On the accuracy of estimating fatigue notch factors
  8. Analytical strength assessments of austempered ductile iron components
  9. On the estimation of cyclic material properties – Part 1: Quality of known estimation methods
  10. On the estimation of cyclic material properties – Part 2: Introduction of a new estimation method
  11. Execution and evaluation of cyclic tests at constant load amplitudes – DIN 50100:2016
  12. Wear resistance of laser cladded Stellite 31 coating on AISI 316L steel
  13. Determination of the Johnson-Cook damage parameter D4 by Charpy impact testing
  14. Effect of residual Alclad on friction stir spot welds of AA2219 alloys
  15. Effect of cooling rate on microstructure, mechanical properties and residual stress of 7075 aluminum alloy
  16. Failure analysis of an adhesively joined composite pipe system under internal pressure
  17. Non-metallic inclusions and fatigue strength of steel 34CrNiMo6
  18. Untersuchungen des Schädigungsgrades von Polyethylenformstoffen als Werkstoffe von Heizöllagerbehältern nach einer Nutzungsdauer von über 30 Jahren
  19. Microstructure and mechanical properties of AZ31 Mg alloy produced by a new compound extrusion technique
  20. Failure analysis of a cracked Q125 casing for ultra-deep wells at the Tarim Oilfield
https://doi.org/10.3139/120.111242

Artikel in diesem Heft

  1. Inhalt/Contents
  2. Contents
  3. Laudatio
  4. Professor Dr.-Ing. Harald Zenner: on the occasion of his eightieth birthday
  5. Fachbeiträge/Technical Contributions
  6. Fatigue life curve – A continuous Wöhler curve from LCF to VHCF
  7. On the accuracy of estimating fatigue notch factors
  8. Analytical strength assessments of austempered ductile iron components
  9. On the estimation of cyclic material properties – Part 1: Quality of known estimation methods
  10. On the estimation of cyclic material properties – Part 2: Introduction of a new estimation method
  11. Execution and evaluation of cyclic tests at constant load amplitudes – DIN 50100:2016
  12. Wear resistance of laser cladded Stellite 31 coating on AISI 316L steel
  13. Determination of the Johnson-Cook damage parameter D4 by Charpy impact testing
  14. Effect of residual Alclad on friction stir spot welds of AA2219 alloys
  15. Effect of cooling rate on microstructure, mechanical properties and residual stress of 7075 aluminum alloy
  16. Failure analysis of an adhesively joined composite pipe system under internal pressure
  17. Non-metallic inclusions and fatigue strength of steel 34CrNiMo6
  18. Untersuchungen des Schädigungsgrades von Polyethylenformstoffen als Werkstoffe von Heizöllagerbehältern nach einer Nutzungsdauer von über 30 Jahren
  19. Microstructure and mechanical properties of AZ31 Mg alloy produced by a new compound extrusion technique
  20. Failure analysis of a cracked Q125 casing for ultra-deep wells at the Tarim Oilfield
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