Influence Of Apparatus Design And Test Method On The High Temperature Solid Particle Erosion Of Nimonic 80a

Work has been progressing over recent years to develop a standard test method for high temperature solid particle erosion testing. Early in 2015 this standard was published by ASTM as G211-14 Standard Test Method for Conducting Elevated Temperature Erosion Tests by Solid Particle Impingement Using Gas Jets. To support the development of this standard the European funded METROSION project has been conducting a comparison of different apparatus which employ different nozzle geometries, acceleration lengths, stand-off distances and heating and accelerating processes. The aim is to understand the influence these instrumental and experimental parameters have on the measured erosion rate and erosion mechanism. As part of this work three very distinct approaches have been compared using a common erodent and test pieces. Measurements have been performed at 600 degrees C with particle velocities of 50 to 320 m/s, using different stand-off distances, acceleration lengths and nozzle diameters for impact angles of 30 and 90 degrees. This is the first time a comprehensive comparison of these parameters has been conducted and shows the relative influence of these experimental variables.