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HAYNES 242 is an alloy that is used when good combinations of strength, toughness and corrosion resistance are required. Since it is intended to be used for long time applications, the effects of temperature, time of exposure, and strain rate are all important factors that. must be considered. In this study, the effects of prior exposure, temperature and strain rate were investigated as to their effects on mechanical properties such as yield strength c/S), ultimate tensile strength (UTS), and ductility (%RA). It is shown that the ductility and UTS increase with increasing strain rate when tested in air, in contrast to what is usually expected. When tested in vacuum, the ductility decreased with increasing strain rate in accord with usual observations. These contrasting behaviours are interpreted in terms of an environmental effect which causes changes in the fracture mechanism as well as the properties. It is noted that while there is an environmental effect, the absolute values of ductility remain very high making this material suitable for applications where long-term exposure and impact loading are considerations.

The Ductility of HAYNES 242TM Alloy as a Function of Temperature, Strain Rate and Environment