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Influence of HIP Parameters on the Microstructure and Mechanical Properties of CP Ti and Ti-6Al-7NB Alloy

  • : Bolzoni, L1
  • : 1University Carlos III
  • : PDF Download
  • : 2012

Abstract

The conventional cold uniaxial pressing and sintering P/M route permits to obtain titanium and titanium alloys with properties and microstructures close to ingot metallurgy products. Nevertheless, some residual porosity which lowers the ductility and fatigue properties is normally left by this route. In this study, hot isostatic pressing (HIP) is applied to sintered materials with the aim of reducing the residual porosity. The influence of the processing parameters on the microstructure and mechanical properties of elemental titanium and the Ti?6Al?7Nb alloy is studied. In particular, four HIP conditions changing one parameter per time (temperature, time and pressure) are considered. The post-processed samples are characterised in terms of relative density, mechanical properties and microstructure analysis. The results indicate that the post-processing by HIP reduces the residual porosity and increases the hardness. Nonetheless, the post-processing changes the fracture mode of the alloys studied from ductile to fragile most probably due to the changes in the shape of the residual porosity.
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