High-temperature flow behaviour modelling of stress–strain curves of the sintered Cu–28Zn pre-alloyed powder compacts considering dynamic recrystallisation

ABSTRACT

In this investigation, an adapted model was developed to predict the dynamic recrystallisation (DRX) flow stress curves of brass Cu–28%Zn, produced via the press-and-sinter route with a nonlinear approximation of the strain hardening rate vs. strain up to the critical stress, using a constitutive equation and Avrami description of DRX. The investigated temperature range was 550–850°C. In this research, according to the microstructure change up to critical point, a separate model was used and after that point a constitutive model considers DRX was presented. This model is used for predicting untested temperatures in order to be utilised in deformation simulation. To evaluate the compound model precision, the mean error was measured. The results demonstrated that the suggested model is in good agreement with experimental results.

KEYWORDS:

• Mathematical modelling
• Cu–28Zn
• powder compacts
• dynamic recrystallisation

Disclosure Statement

No potential conflict of interest was reported by the authors.

Notes on contributors

Rozita Rouzegar studied master period of materials science and engineering in the field of metal forming at Shiraz university, and currently she is also PhD student of the Sahand university of technology, since 2012 and from that time she has been doing research in powder metallurgy and modelling of hot deformation.

Maziyar Azadbeh studied powder metallurgy at TU Wien, obtaining his PhD in 1980. Since that time he has been doing research in powder metallurgy. From 2003 he is associated Professor for materials science and engineering at Sahand University of technology, and currently he is also Faculty member of Sahand University of technology. He has published more than 450 articles, mostly on powder metallurgy topics.

Herbert Danninger studied Technical Chemistry at TU Wien, obtaining his PhD in 1980. Since that time he has been doing research in powder metallurgy. From 2003 he is Full Professor for Chemical Technology of Inorganic Materials at TU Wien, and currently he is also Dean of the Faculty of Technical Chemistry. He has published more than 450 articles, mostly on powder metallurgy topics, and holds 3 honorary doctorates.

ORCID

Rozita Rouzegar http://orcid.org/0000-0002-1696-1012

Maziyar Azadbeh http://orcid.org/0000-0001-8739-2024

Herbert Danninger http://orcid.org/0000-0002-7205-9058