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Ni-Fe-base superalloy 706 has been used for high temperature services. The time - temperature - precipitation (TTP) diagram is essential in the design of heat treatments for any precipitation strengthened superalloy. The TTP diagrams have been already presented for Alloy 706. However, effects of aluminum, titanium and niobium, important substitutional elements of y ’ and y ” precipitates, on the TTP behavior are not clear in the literature. In this study, the TTP and the time - temperature - hardness (TTH) diagrams are presented for experimental alloys containing only one or two of Ti, Nb and Al, in a temperature range of 600 - 900°C. The observation by optical microscopy, scanning electron microscopy and transmission electron microscopy revealed that y ’ , y “, y ‘- y ” co-precipitates and 17 form in alloys containing Ti. Among the three elements, Ti plays the most important role in the precipitation strengthening behavior of Alloy 706. Furthermore, neither Al nor Nb can demonstrate their effects without Ti addition. Nb promotes y ” formation and prevents 7 formation. Al enhances the formation of stable y ‘- y ” co-precipitates, more effectively in the co-existence of Ti and Nb.

Effects of Aluminum, Titanium and NioBium on the Time-Temperature-Precipitation Behavior of Alloy 706