Investigations of α + β → β Phase Transformation in Monotonically Heated Ti6Al7Nb Alloy / Badania Przemiany Fazowej α + β → β W Stopie Ti6Al7Nb Przy Nagrzewaniu Ciągłym

Open access

This paper presents an evaluation of critical temperatures of α + ββ phase transformation in an Ti6Al7Nb alloy occurring during heating performed by dilatometric and metallographic methods. Also, changes in the alloy microstructure during cooling down from the two-phase (α + β) and single phase (β) ranges have been analysed. In the microstructure of the alloy quenched from temperature above 1010°C (one-phase range) in water, the very fine, needle-like precipitates (presumably α’) were observed as well as abnormal grain growth of the primary β phase. The obtained results may serve for the interpretation of phase transformation occurring in the Ti6Al7Nb alloy during tempering. In future, the kinetics of the phase transformation during tempering will be investigated by original CHT (Continuous-Heating-Transformation) charts, which are commonly applied for iron-base alloys.

[1] J. Marciniak, Biomateriały, Wyd. Pol. Śląska, Gli­wice 2002.

[2] M. Niinomi, Materials for biomedical devices, Wood Head Publishing Limited 2010.

[3] H.J. Rack, J.I. Qazi, Titanium alloys for biomedical applications. Mat. Sci. Eng. C26, 1269-1277 (2006).

[4] J. Marciniak, Metallic Biomaterials - directions and development forecast, 19th International Scientif­ic and Technical Conference, Kontech, Advanced Form­ing Technologies and Nanostructured Materials, 103-124 (2012).

[5] S. Skrzypek, K. Przybyłowicz, Inżynieria metali i ich stopów, AGH, Kraków 2012.

[6] C. Layens, M. Peters (red.), Titanium alloys: fundamentals and applications, Wiley-VCH 2003.

[7] ASM Committee on titanium alloys: Heat treatment of titanium and titanium alloys, Metals Handbook, 9th edi­tion 4, 763-774 (1981).

[8] A. Bylica, J. Sieniawski, Tytan i jego stopy, PWN, Warszawa 1985.

[9] V.A. Joshi, Titanium Alloys: An atlas of surfaces and fracture features 7-13 (2006).

[10] D.R. Askeland, Titanium alloys. The Science and Engineering of Materials, PWS-Kent, Publishing Com­pany 231-236 (1984).

[11] U. Zwicker, Titan und Titanlegierungen, Berlin - Heidelberg - New York: SPRINGER - Verl 1974.

[12] T. Ahmed, H.J. Rack, Phase transformations during cooling in α + β titanium alloys, Mat. Sci. Eng. A243, 206-211 (1988).

[13] M.K. Mc Quillan, Phase transformations in titani­um and its alloys, Imperial Metal Industries, Metallur­gical Reviews 1963.

[14] H.H. Weigand, Zur Umwandlung von α + β Titan­legierungen mit Aluminium, Metallkunde 54, 1, 43-49 (1963).

[15] R. Dąbrowski, Analysis of the critical tempera­tures, hardness and microstructure changes of Ti6Al4V alloy during cooling from two-phase α + β and one-phase β range, Ores and Non-Ferrous Metals 10, 708-716 (2010).

[16] R. Dąbrowski, The kinetics of phase transforma­tions during continuous cooling of the Ti6Al4V alloy from the single-phase β range, Archives of Metallurgy and Materials 56, 3, 703-707 (2011).

[17] R. Dąbrowski, The kinetics of phase transforma­tions during continuous cooling of Ti6Al4V alloy from the diphase α + β range, Archives of Metallurgy and Materials 56, 2, 217-221 (2011).

[18] J. Pacyna, Metaloznawstwo pękania stali narzę­dziowych, Metalurgia i Odlewnictwo, 120 (1988).

Archives of Metallurgy and Materials

The Journal of Institute of Metallurgy and Materials Science and Commitee on Metallurgy of Polish Academy of Sciences

Journal Information


IMPACT FACTOR 2016: 0.571
5-year IMPACT FACTOR: 0.776

CiteScore 2016: 0.85

SCImago Journal Rank (SJR) 2016: 0.347
Source Normalized Impact per Paper (SNIP) 2016: 0.740

Cited By

Metrics

All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 97 96 10
PDF Downloads 55 54 11