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The effect of annealing on the mechanical properties of Ni 201 alloy

Commercial Nickel 201 alloy is widely used as a sealing material in applications under extreme temperatures and pressures. This study was designed to confirm the ability of the alloy to recover after annealing in a short time. After annealing at 950 °C in a vacuum chamber, tensile testing was performed on the specimens after 12, 60, 108, 168, 288 h and 312 h of natural aging. The results were compared with non-annealed state. It was shown that the significant decrease of yield stress and ultimate tensile strength occurs after annealing. With increasing recovery time after annealing, the slight decrease of yield stress was observed up to 240 h. After 288 h the yield stress slightly increased. The microstructure of annealed specimens was analyzed using electron back-scatter diffraction, and the effect was confirmed by subgrain-recrystallized grain ratio calculations. Obtained stress-strain curves also confirm that this material can be safely used for the sealing manufacturing after 312 h after annealing without significant degradation. So, the attainability of the required parameters is reached.