Study on the Microstructure of Hot Deformed Cu-28Zn Prealloyed Powder Compacts

Document Type : Research Paper

Authors

1 Department of Materials Engineering, Sahand University of Technology, P.O. Box 51335-1996, Tabriz, Iran

2 Chemical Engineering Department, Iran University of Science &Technology, Narmak, Tehran, Iran, Zip Code: 16846

Abstract

The role of microstructure on hot deformation behavior of sintered Cu-28Zn prealloyed powder compacts was investigated by a series of isothermal hot compression tests in the temperature range of 550- 850°C at strain rates of 0.001, 0.01, 0.1 and 0.5 s-1, by taking into consideration the Hyperbolic Sine functional behavior to analyze the deformation behavior of the alloy. The results indicate that dynamic recrystallization (DRX) has occurred in a large scale. The DRX nucleation sites are along initial grain boundaries, inside the twin bands and triple junctions. In all stress- strain curves in strains more than 0.2 dynamic recovery (DRV) and DRX take place simultaneously. The effect of strain rate and temperature on dynamically recrystallized grain refinement was investigated. Microstructure is in compliance with the results through the Zener-Hollomon relation and has satisfied hot deformation stress- strain curves. This study may provide a new understanding on hot plastic deformation of sintered prealloyed particles microstructure. The results obtained can be used to develop and optimize the conditions of hot plastic deformation of similar prealloyed powder compact.

Keywords

References

[1] X. He, Z. Yu, X. Lai, A method to predict flow stress considering dynamic recrystallization during hot deformation, Computational Materials Science 44 (2008) 760-764.
[2]  P. Hodgson, L. Kong, C. Davies, The prediction of the hot strength in steels with an integrated phenomenological and artificial neural network model, Journal of Materials Processing Technology 87 (1999)131-138.
[3]  H. Mirzadeh, A. Najafizadeh, Extrapolation of flow curves at hot working conditions, Materials Science and Engineering: A 527 (2010) 1856-1860.
[4]  J. Cabrera, J. Ponce, and J. Prado, Modeling thermomechanical processing of austenite. Journal of materials processing technology 143 (2003) 403-409.
[5]  T. Altan, F. Boulger, Flow stress of metals and its application in metal forming analyses, Journal of Engineering for Industry 95(4) (1973) 1009-1019.
[6]  H. McQueen, J. Jonas, Recovery and recrystallization during high temperature deformation, Treatise on materials science and technology 6 (1975) 393-493.
[7]  S. Kim, Y. Lee, S. Byon, Study on constitutive relation of AISI 4140 steel subject to large strain at elevated temperatures, Journal of Materials Processing Technology 140 (2003) 84-89.
[8]M.R. Barnett, Hot working microstructure map for magnesium AZ31, Materials Science Forum (2003).
[9]  S.H. Avner, Introduction to physical metallurgy, Vol. 2, McGraw-hill New York (1974).
[10] G. Upadhyaya, Sintered metallic and ceramic materials-sintered low-alloy ferrous materials, John Wiley & Sons LTD, West Sussex, England (2000).
[11] M. Azadbeh, H. Danninger, A. Mohammadzadeh, C. Gierl-Mayer, Macroscopic illustration of Zn evaporation during liquid phase sintering of Cu–28Zn prepared from prealloyed powder, Powder Metallurgy 58 (2015) 91-94.
[12] R. Rouzegar, M. Azadbeh, H. Danninger, Modelling the high temperature flow behaviour of sintered Cu–28Zn pre-alloyed powder compacts considering the effect of strain, Powder Metallurgy (2017) 1-7.
[13] D. Ponge, G. Gottstein, Necklace formation during dynamic recrystallization: mechanisms and impact on flow behavior, Acta Materialia 46 (1998) 69-80.
[14] S. Mandal, M. Jayalakshmi, A. K. Bhaduri, V. S. Sarma, Effect of strain rate on the dynamic recrystallization behavior in a nitrogen-enhanced 316L (N),  Metallurgical and Materials Transactions A 45 (2014) 5645-5656.
[15] J. Wang, J. Dong, M. Zhang, X. Xie, Hot working characteristics of nickel-base superalloy 740H during compression, Materials Science and Engineering: A 556 (2013) 61-70.
[16] H. Zhang,  K. Zhang, H. Zhou, Z. Lu, C. Zhao, X. Yang, Effect of strain rate on microstructure evolution of a nickel-based superalloy during hot deformation, Materials & Design 80 (2015) 51-62.
[17] D. Padmavardhani, Y. Prasad, Characterization of hot deformation behavior of brasses using processing maps: Part II. β Brass and α-β brass, Metallurgical Transactions A 22 (1991) 2993-3001.
[18] Y. Lin, M.S. Chen, J. Zhong, Microstructural evolution in 42CrMo steel during compression at elevated temperatures, Materials Letters 62 (2008) 2132-2135.
Iranian Journal of Materials Forming
Volume 7, Issue 2 - Serial Number 2
October 2020
Pages 70-77

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