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Effect of Hot Isostatic Pressing on the Performance of Heat-Treated Ti-6Al-4V Alloys Manufactured via Laser Powder Bed Fusion

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Given the increased development of additive manufacturing technologies, which allows the production of complex-shaped advanced parts, a special attention is necessary towards reducing processing defects and achieving fully dense and homogenous materials. In this work, the assessment of Ti-6Al-4V powders is thoroughly carried out, followed by production of parts by multi-beam laser powder bed fusion (LPBF) and post-processing treatments, including hot isostatic pressing (HIP) with a focus on reducing porosity. Fundamental knowledge is built through the analysis of the resultant powder and microstructures in order to predict mechanical properties. Room temperature tensile strength, impact toughness and high-cycle fatigue properties are reviewed, assisted by a microscopy study to detect any microstructural damage, which can drastically reduce mechanical performance and lead to the propagation of cracks under dynamic loading. The presence of such defects and their influence on the performance of heat-treated and HIPed parts are also discussed to evaluate building parameters and bespoke heat treatments to achieve superior properties. A comparison is made between the effect of these stages on LPBF and traditionally cast and HIPed Ti-6Al-4V alloys for aerospace and medical applications.

Learning Objectives:

  • Define the best processing routes for a Ti-6Al-4V alloy manufactured via SLM to best allocate resources towards the intended applications and needs
  • Understand the advantages and disadvantages of carrying out a post processing technique such as hot isostatic pressing, in terms of metallurgy and mechanical properties