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A detailed assessment of the macroscopic and microstructural cyclic deformation behavior of Haynes 188” has been conducted under various isothermal and thermomechanical conditions over the temperature range 26 to 1000°C. A fully reversed mechanical strain range of 0.8% was examined with constant mechanical strain rates of 109s-’ and 104s-‘. Particular attention was given to the effects of dynamic strain aging (DSA) on the stress-strain response. Detailed transmission electron microscopy was conducted to examine the deformation substructures and establish correlations with the cyclic macroscopic behaviors. Although DSA was found to occur over a wide temperature range between approximately 300 and 700°C the microstructural characteristics and deformation mechanisms responsible for DSA varied considerably and were dependent upon temperature. In general, the operation of DSA processes led to a maximum of the cyclic stress amplitude at -65O”C, and was accompanied by pronounced planar slip, the generation of stacking faults and high dislocation density. DSA was evidenced through a combination of phenomena, including serrated yielding, an inverse dependence of maximum cyclic hardening with strain rate (6), and an instantaneous inverse 8 sensitivity. The TMF cyclic hardening behavior exhibited unique behaviors in comparison to the isothermal response, predominantly at the minimum TMF temperature extremes.

Cyclic Deformation of Haynes 188 Superalloy Under Isothermal and Thermomechanical Loadings