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Supreme quality alloy 718 production requires to meet low contents of oxygen and nitrogen. The oxygen and nitrogen effects and microalloying of Mg at low level of oxygen and nitrogen have been studied in alloy 718. Oxygen and nitrogen increase the amount of Laves phase in cast ingots, however there are no distinguished influences on tensile and stress rupture properties of hot rolled alloy 718 bar specimens from homogenized ingots with contents of oxygen and nitrogen less than 20 and 50 ppm respectively. Magnesium still shows its beneficial effect on stress rupture life in alloy 718 with low contents of oxygen ( < IOppm ) and nitrogen (< 20ppm). Interdendritic &Ni,Nb can precipitate directly from the liquid and its formation mechanism should be investigated further.

Effect of Oxygen, Nitrogen and Magnesium on Segregation, Solidification and Mechanical Properties in Alloy 718