APPLICATION OF ALEXANDER-MALAS CRITERION OF PLASTIC FLOW STABILITY FOR ESTIMATION OF PM TI-6AL-2SN-4ZR-6MO ALLOY FORGING CONDITIONS

1 WOJTASZEK Marek
Co-authors:
1 ŁUKASZEK-SOŁEK A. 1 ŚLEBODA T. 1 LYPCHANSKYI O.
Institution:
1 AGH University of Science and Technology, Faculty of Metals Engineering and Industrial Computer Science, Cracow, Poland, EU
Conference:
25th Anniversary International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 25th - 27th 2016
Proceedings:
Proceedings 25th Anniversary International Conference on Metallurgy and Materials
Pages:
1577-1582
ISBN:
978-80-87294-67-3
ISSN:
2694-9296
Published:
14th December 2016
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
76 views / 15 downloads
Abstract

Ti-6Al-2Sn-4Zr-6Mo (Ti-6-2-4-6) is a high strength titanium alloy having low density and good corrosion resistance. The primary commercial applications of this alloy are forgings designed for working at intermediate temperature turbine engine rotating components. Currently the most common charge for forging is cast material. However, a promising alternative for producing such stock can be powder metallurgy (PM). This approach gives the opportunity to receive high quality products with fine microstructure and profitable mechanical properties. An application of Alexander-Malas criterion of plastic flow stability in reference to the investigated material makes possible to predict the material flow behaviour during hot processing as well as can be used as the basis for selection of the profitable parameters of forging.As the initial material for the investigations Ti-6-2-4-6 alloy compacts were used. The characteristics of hot deformation behaviour of Ti-6-2-4-6 alloy was studied using processing maps obtained on the basis of flow stress data, generated in compression tests performed at the temperature range of 800 – 1100oC and at the strain rate ranging from 0.01 s-1 to 10 s-1. The microstructure of selected samples after deformation was observed. Based on elaborated criteria of plastic flow stability, the processing maps for constant value of strain were developed. Complex processing maps, describing the areas of flow instabilities and processing window, were also developed.The determined domains were interpreted taking into account criteriadescribingmechanical and microstructural stability of thermomechanical processing.

Keywords: Titanium alloy, plastic flow stability, processing maps, powder metallurgy

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