Analysis on Microstructural Evolution of PtAl Diffusion Coating on Ni-based Superalloy Influenced by Creep Process
2012 (English)Conference paper, Presentation (Other academic)
The microstructural evolution of PtAl diffusion coating on a nickel-base superalloy IN792 was studied to assess the influence of high temperature (850 °C and 950 °C) and static creep loading conditions. The chemical composition analysis by EDS reveals that local enrichment of Cr, W and Mo is responsible for the formation of σ, Cr-α and μ/R particles in the different characteristic zones in the PtAl coating. Being taken as an approach to describe the coating’s microstructure evolution, a so-called Effective Coating Thickness (ECT) is defined and was measured for different creep conditions. It is found that the value of ECT is controlled by the inward diffusion of Al and Pt, being demonstrated by the existence of a linear correlation between ECT and diffusion coefficient of Al in substrate; t: diffusion time). Simulated ECT development of the PtAl diffusion coating agrees well with the experimental results at 850 °C and 950 °C.
Place, publisher, year, edition, pages
Creep, PtAl diffusion coating, IN792, microstructural evolution
Engineering and Technology Materials Engineering
IdentifiersURN: urn:nbn:se:liu:diva-84300OAI: oai:DiVA.org:liu-84300DiVA: diva2:558619
The 4th Conference on the Integrity of High Temperature Welds & 9th International Conference on Creep and Fatigue, September 25-27 2012, London, UK