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Fatigue behaviour of HIPed and stress relieved Ti6Al4V alloy specimens produced by SLM
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  • Joel da Silva de Jesus,
  • Luis Borrego,
  • José Ferreira,
  • Jose Costa,
  • Carlos Capela
Joel da Silva de Jesus
Universidade de Coimbra Departamento de Engenharia Mecanica
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Luis Borrego
ISEC, Polytechnic Institute of Coimbra
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José Ferreira
University of Coimbra
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Jose Costa
University of Coimbra
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Carlos Capela
Instituto Politecnico de Leiria Escola Superior de Tecnologia e Gestao
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Abstract

Fatigue behaviour of HIPed and stress relieved Ti6Al4V alloy specimens produced by SLM was analysed (Rε = -1). The HIP process caused a microstructural transformation decreasing the hardness and monotonic properties that not allowed fatigue strength increase. A bilinear behaviour in the elastic strain-fatigue life curve was observed, because of Young´s modulus decrease during the cyclic elasto-plastic tests consequence of subgrains formation. The Smith-Watson-Topper and total strain energy density models showed a good concordance between predicted and experimental fatigue lives in notched samples.