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Single crystal Ni-based gas turbine blades show a combination of large casting pores and pores from the homogenization heat treatment. Both kinds of pores can only be reduced by HIP; however, HIP not only reduces porosity but also affects the size, number and morphology of γ particles. From the HIP parameters, pressure, temperature, holding time and cooling speed, the main effect on both, the porosity and the γ /γ microstructure is due to temperature and cooling rate. HIP temperatures above thedoi:10.1051/matecconf/20141413009 fatcat:dazhi5afrvfojfqlt6sgvnmvre