Influence of hot isostatic pressing on the properties of 316L stainless steel, Al-Mg-Sc-Zr alloy, titanium and Ti6Al4V cold spray deposits

In this paper an effect of capsule-free hot isostatic pressing (HIP) on the porosity and mechanical properties of different cold spray deposits was experimentally evaluated. The HIP post-treatment significantly decreased (more than 2 times) the porosity of 316L and pure titanium deposits. The densification effect of HIP on the porous Ti6Al4V deposit was significantly less pronounced. Mechanical properties of the deposits after HIP were also improved. In particular, the tensile strength of the stainless steel, pure titanium and Ti6AL4V increased from 30 MPa, 70 MPa and 20 MPa to 211 MPa, 480 MPA and 560 MPa correspondingly. Compressive strength of the Al-Mg-Sc-Zr alloy samples after HIP was also increased similar to 25%. Improvement of mechanical properties is explained by material diffusion and microstructure changes during HIP cycle.

Automated summary

The effect of capsule-free hot isostatic pressing (HIP) on the porosity and mechanical properties of different cold spray deposits was evaluated experimentally. The HIP post-treatment significantly decreased the porosity of 316L and pure titanium deposits, while the densification effect on porous Ti6Al4V deposits was less pronounced. Mechanical properties, including tensile and compressive strength, were improved after HIP treatment, with an explanation given for the changes in material diffusion and microstructure during the HIP cycle.