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Users of 71 8 for oil field applications generally require a minimum 0.2% R.T. tensile strength of 120 ksi. and hardness in the range of Rc 30- 40. The effect of compositional variations involving columbium and aluminum on hardness and tensile properties was evaluated using six different 718 compositions with columbium in the range 4.85 to 5.5 wt. percent and aluminum content of 0.37 to 0.69 wt. percent. The effect of solution and aging treatments on hardness was studied in the solution treatment range 1800” F to 1950” F /Zh/ W.Q. Aging treatments of 4h and 8h in the range 1200” F to 1500” F were evaluated. Results show that heat treatments of 1875”F/Zh/WQ + 1450” F/8h/AC and 1900” F/2h/WQ + 1425” F or 1450” F/8h/ AC result in a satisfactory combination of properties for all compositions evaluated. Underaging appears to result in higher ductility for similar strength and hardness as compared to overaging but underaged properties are sensitive to variations in composition and aging temperature. The effect of variations in columbium and more specially aluminum are much reduced when higher solution temperatures and aging are used as compared to the 1750” F + 1325/l 150” F we utilized for typical aerospace applications. Structures resulting are characterized.

Effect of Varying Aluminum and Columbium Content on Hardness and Tensile Properties of 718 Alloy Heat Treated for Oil Field Requirements