Creep deformation and rupture behaviour of directionally solidified GTD 111 superalloy |
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Authors: | A R IBANEZ V S SRINIVASAN ASHOK SAXENA |
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Affiliation: | INVAP SE, Moreno 1089, S.C. de Bariloche, 8400, Argentina;and Department of Mechanical Engineering, College of Engineering, University of Arkansas, Fayetteville, AR 72701, USA |
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Abstract: | The creep behaviour of directionally solidified (DS) Ni‐base superalloy GTD 111 has been investigated at various temperatures (649 °C to 982 °C) and stresses (124 MPa to 896 MPa). Specimens machined in longitudinal and transverse directions with respect to the grain orientation from three batches of the material were tested. The specimens in the longitudinal direction consistently exhibited higher creep rupture life and creep ductility than specimens from the transverse direction. There were some systematic variations in creep deformation and rupture behaviour among specimens from different batches. Optical and scanning electron microscopy investigations were conducted to understand the creep rupture behaviour. Various deformation and rupture models were evaluated for representing the creep behaviour of the alloy and a neural network model was applied to creep rupture data to assess its predictive capability. |
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Keywords: | creep rupture directionally solidified superalloy neural network theta projection |
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