Improvement in ductility in commercially pure titanium alloys by stress relaxation at room temperature

Irena Eipert, Giribaskar Sivaswamy*, Rahul Bhattacharya, Muhammad Amir, Paul Blackwell

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

12 Citations (Scopus)

Abstract

Present work focusses on the effect of stress relaxation on the tensile behaviour of two commercially pure titanium alloys of different strength levels (Grade 1 and Grade 4) subjected to tensile tests at room temperature. The stress relaxation tests were performed by interrupting the tensile tests at regular strain intervals of 5% in the plastic region of the tensile curve and compared to the monotonic tensile tests at different strain rates ranging from 10-4 to 10-1s-1. To understand the effect of anisotropy, samples were taken along 0̊ and 90̊ to rolling direction (RD) for both the alloys. Improvement in ductility of different levels at all the strain rates was observed in both the alloys when stress relaxation steps were introduced as compared to monotonic tests. However there is not much change in the flow stress as well as in strain hardening behaviour of the alloys. The true stress-true strain curves of Grade 4 samples taken in 90̊ to RD exhibited discontinuous yielding phenomenon after the yield point, which is termed as a yield-point elongation (YPE). The improvement in ductility of the Cp-Ti alloys can be linked to recovery process occurring during the stress relaxation steps which resulted in the improvement in ductility after repeated interrupted tensile tests. The paper presents and summarise the results based on the stress relaxation for the two different alloys.

Original languageEnglish
Title of host publicationKey Engineering Materials
EditorsJari Larkiola
PublisherTrans Tech Publications Ltd
Pages92-98
Number of pages7
Volume611-612
ISBN (Print)9783038351061
DOIs
Publication statusPublished - 1 Jan 2014
Event17th Conference of the European Scientific Association on Material Forming, ESAFORM 2014 - Espoo, United Kingdom
Duration: 7 May 20149 May 2014

Publication series

NameKey Engineering Materials
Volume611-612
ISSN (Print)1013-9826

Conference

Conference17th Conference of the European Scientific Association on Material Forming, ESAFORM 2014
CountryUnited Kingdom
CityEspoo
Period7/05/149/05/14

Keywords

  • ductility
  • commercially pure
  • titanium alloys
  • stress relaxation
  • room temperature
  • Cp-titanium alloys
  • formability
  • monotonic tensile tests
  • yield point elongation

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