High Temperature Creep Behaviour of Cast Nickel-Based Superalloys INC 713 LC, B1914 and MAR-M247

Cast nickel-based superalloys INC713 LC, B1914 and MAR-M247 are widely used for high temperature components in the aerospace, automotive power industries due to their good castability, level of strength properties at hot corrosion resistance. The present study is focused on mutual comparison creep above-mentioned superalloys, fracture behaviour identification deformation mechanism(s). Standard constant load uniaxial tests were carried out up rupture applied stress ranging from 150 700 MPa temperatures 800–1000 °C. experimentally determined values exponent minimum rate, n, rationalized by considering existence threshold stress, σ0. corrected correspond power-law regime suggest dislocation climb glide as dominating mechanisms. Fractographic observations clearly indicate that a brittle mostly mixed transgranular intergranular mode, resulting relatively low strain. Determined main parameters show superalloy exhibits best properties, followed then LC. However, each investigated can be successfully fulfils required service loading conditions.