The Non-Proportional Behaviour of a Nickel-Based Superalloy at Room Temperature, and Characterisation of the Additional Hardening Response by a Modified Cyclic Hardening Curve

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 across a range of 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.


Matthew R. Bees 1, Stephen J. Pattison2, Neil Fox2 and Mark T. Whittaker1

1Institute of Structural Materials, College of Engineering, Swansea University, Swansea, UK, SA2 8PP
2 Rolls-Royce plc, PO Box 31, Derby, Derbyshire, UK, DE24 8BJ

International Journal of Fatigue, Vol 67, (2014) pp  134-141, doi:10.1016/j.ijfatigue.2014.02.023