Quench-Induced Stresses in AA2618 Forgings for Impellers: A Multiphysics and Multiscale Problem

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• 作者：Nicolas Chobaut ; Peter Saelzle ; Gilles Michel ; Denis Carron ; Jean-Marie Drezet
• 刊名：JOM Journal of the Minerals, Metals and Materials Society
• 出版年：2015
• 出版时间：May 2015
• 年：2015
• 卷：67
• 期：5
• 页码：984-990
• 全文大小：1,162 KB
• 参考文献：1.G. Pouget and C. Sigli, Mater. Sci. Forum 794, 691 (2014).View Article
  2.J.M. Drezet and A. Phillion, Metall. Mater. Trans. A 41, 3396 (2010).View Article
  3.N. Chobaut (Ph.D. Thesis, 脡cole Polytechnique F茅d茅rale de Lausanne, Lausanne, Switzerland, 2015).
  4.P. Pilvin, G. Cailletaud, Proceedings of the second International Symposium on Inverse Problems, eds. H.D. Bui, M. Tanaka, M. Bonnet, H. Maigre, E. Luzzato, and M. Reynier (Leiden, The Netherlands: CRC Press/Balkema, 1994), pp. 79鈥?6.
  5.M.E. Fitzpatrick and A. Lodini, Analysis of Residual Stress by Diffraction Using Neutron and Synchrotron Radiation (Boca Raton: CRC Press, 2003).
  6.N. Chobaut et al., Proceedings of ICAA13, eds. H. Weiland, A.D. Rollett, and W.A. Cassada (Materials Park, OH: TMS, 2012), pp. 285鈥?91.
  7.D. B眉che, N. Hofmann, and P. S盲lzle (Paper presented at the NAFEMS World Congress, 2005).
  8.G. Michel, Investigation of the Build-Up of Residual Stresses in Large Impellers During Quenching (internal report, Laboratoire de Simulation des Materiaux, 2014).
  
• 作者单位：Nicolas Chobaut (1)
  Peter Saelzle (2)
  Gilles Michel (1)
  Denis Carron (3)
  Jean-Marie Drezet (1)
  
  1. Laboratoire de Simulation des Mat茅riaux, 脡cole Polytechnique F茅d茅rale de Lausanne, Station 12, 1015, Lausanne, Switzerland
  2. ABB Turbo Systems Ltd, Baden, Switzerland
  3. LIMATB, EA 4250, Univ. Bretagne-Sud, 56100, Lorient, France
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Metallic Materials
  Nanotechnology
  Crystallography
  
• 出版者：Springer Boston
• ISSN：1543-1851

文摘

In the fabrication of heat-treatable aluminum parts such as AA2618 compressor impellers for turbochargers, solutionizing and quenching are key steps to obtain the required mechanical characteristics. Fast quenching is necessary to avoid coarse precipitation as it reduces the mechanical properties obtained after heat treatment. However, fast quenching induces residual stresses that can cause unacceptable distortions during machining. Furthermore, the remaining residual stresses after final machining can lead to unfavorable stresses in service. Predicting and controlling internal stresses during the whole processing from heat treatment to final machining is therefore of particular interest to prevent negative impacts of residual stresses. This problem is multiphysics because processes such as heat transfer during quenching, precipitation phenomena, thermally induced deformations, and stress generation are interacting and need to be taken into account. The problem is also multiscale as precipitates of nanosize form during quenching at locations where the cooling rate is too low. This precipitation affects the local yield strength of the material and thus impacts the level of macroscale residual stresses. A thermomechanical model accounting for precipitation in a simple but realistic way is presented. Instead of modelling precipitation that occurs during quenching, the model parameters are identified using a limited number of tensile tests achieved after representative interrupted cooling paths in a Gleeble machine. The simulation results are compared with as-quenched residual stresses in a forging measured by neutron diffraction.