Selection of etching methods of primary carbides in MAR-M247 nickel–base superalloy for computer-aided quantitative metallography

The usefulness of various etching methods for revealing the structure of MAR-M247 nickel–base superalloy and image acquisition methods were analyzed from a desire to estimate primary carbides quantitatively. The analysis was carried out on images registered using light and scanning electron microscopes. The analyzed images contained a complete range of primary carbides occurring in the matrix and on the grain boundaries of MAR-M247 alloy.