The effect of aging and cold working on the high-temperature low-cycle fatigue behaviour of Alloy 800H. I

The authors describe the effect of aging and cold working on the low-cycle fatigue behaviour of alloy 800H in the temperature range 5380 to 7600C. In the 'as received' condition the material used is this study was solution annealed. Fatigue specimens were made from the solution-annealed material, and also from material that had undergone the following treatments: aging for 4000 and 8000 hr at temperatures of 5380, 5930, 6490, 7040, and 7600C; cold working 5 and 10% in tension; and combinations of these two treatments. The microstructure of the specimens is determined after the various aging and deformation treatments. The yield strength resulting from the formation of the precipitates is then studied. (Auth.)