Dynamic phase evolution in titanium alloy Ti-6A1-4V

P. Homporová, Maria Cecilia Poletti, M. Stockinger, F. Warchomicka

Research output: Chapter in Book/Report/Conference proceedingConference contributionResearchpeer-review

Abstract

Industrial processing of the Ti-6A1-4V alloy consists of different steps of heat treatments and hot deformation. The heat treatments are dependent on the kinetic of the allotropic phase transformation, which can be characterized by static and dynamic methods. The methods of post morten samples such as metallography and EPMA combined with Image Analysis were used to quantify the α phase by freezing the microstructure after different heat treatments. The dynamic methods allowed detecting the temperature of phase transformations during heating or cooling. The aim of this work is to determine the phase transformation evolution of Ti-6A1-4V of defined starting microstructures. Samples heat treated in α+β and β fields with controlled cooling rates and water quenching were characterized by α combination of dilatometry, differential scanning calorimetry (DSC) and metallography. Pre annealing heat treatments in the 930-1030°C range using different cooling rates result in a wide combination of primary α, β, martensite and secondary α phases with different thickness. Continuous heating was carried out by DSC and the peaks observed were correlated with the microstructure obtained from interrupted tests. Transformation of α into β was identified as endothermic peaks, while the transformation of martensite into β and α produced an exothermic peak. Both phenomena provoke a detectable retardation in the rate of the length expansion, denoted by dilatometry experiments. Secondary α laths transformed into β at lower temperatures than primary α, and became thinner and shorter by increasing the temperature.

Original languageEnglish
Title of host publicationTi 2011 - Proceedings of the 12th World Conference on Titanium
Pages737-740
Number of pages4
Volume1
Publication statusPublished - 2012
EventTi-2011 - Peking, China
Duration: 18 Jun 201125 Jun 2011

Conference

ConferenceTi-2011
CountryChina
CityPeking
Period18/06/1125/06/11

Keywords

  • Differential scanning calorirnetry
  • Dilatometry
  • Phase transformation
  • Ti-6Al-4V

ASJC Scopus subject areas

  • Ceramics and Composites

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    Homporová, P., Poletti, M. C., Stockinger, M., & Warchomicka, F. (2012). Dynamic phase evolution in titanium alloy Ti-6A1-4V. In Ti 2011 - Proceedings of the 12th World Conference on Titanium (Vol. 1, pp. 737-740)