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A study was carried out where tension-torsion deformation strain-controlled tests were completed at Swansea University, to characterise the non-proportional hardening response of a nickel-based superalloy at different strain ranges. The data generated was used to assess the validity of a non-proportional cyclic hardening curve correction proposed by Socie and Marquis to represent the material’s hardening response. This modification involves the linear translation of the proportional cyclic strain hardening curve to represent the additional hardening response.