Abstract
Cast nickel-based superalloys INC713 LC, B1914 and MAR-M247 are widely used for high temperature components in the aerospace, automotive and power industries due to their good castability, high level of strength properties at high temperature and hot corrosion resistance. The present study is focused on the mutual comparison of the creep properties of the above-mentioned superalloys, their creep and fracture behaviour and the identification of creep deformation mechanism(s). Standard constant load uniaxial creep tests were carried out up to the rupture at applied stress ranging from 150 to 700 MPa and temperatures of 800–1000 °C. The experimentally determined values of the stress exponent of the minimum creep rate, n, were rationalized by considering the existence of the threshold stress, σ0. The corrected values of the stress exponent correspond to the power-law creep regime and suggest dislocation climb and glide as dominating creep deformation mechanisms. Fractographic observations clearly indicate that the creep fracture is a brittle mostly mixed transgranular and intergranular mode, resulting in relatively low values of fracture strain. Determined main creep parameters show that the superalloy MAR-M247 exhibits the best creep properties, followed by B1914 and then the superalloy INC713 LC. However, that each of the investigated superalloys can be successfully used for high temperature components fulfils the required service loading conditions.
Highlights
Cast nickel-based superalloys have been widely utilized for high temperature components, such as disc rotors, turbine blades and integral wheels
This study is focused on the comparison of high temperature creep behaviour of three nickel-based superalloys, namely Inconel 713 LC, B1914 and MAR-M247, and on determining the factors influencing the differences in their creep resistance and lifetime [1,2]
The pre-cast rods of superalloy B1914 were subjected to hot isostatic pressing (HIP) treatment at the temperature 1155 ◦ C and the pressure 100 MPa for 3 h in argon atmosphere, followed by two-step heat treatment consisting of solution annealing at the temperature 1080 ◦ C for 4 h with cooling in air and precipitation annealing at the temperature 900 ◦ C for 10 h with cooling in air
Summary
Cast nickel-based superalloys have been widely utilized for high temperature components, such as disc rotors, turbine blades and integral wheels. Every rotation parts of the component work at a higher temperature and are subjected for a prolonged time to centrifugal forces, and to the resulting tensile stress. This means that the creep will probably be the major mode of damage and will determine the component’s lifetime. Research the high temperature creep properties of variously alloying nickel-based superalloys for producing costly, highly reliable parts with regard to their further applications and cost seems to be strongly needed. This study is focused on the comparison of high temperature creep behaviour of three nickel-based superalloys, namely Inconel 713 LC, B1914 and MAR-M247, and on determining the factors influencing the differences in their creep resistance and lifetime [1,2]
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