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Titanium Metallurgical L a b o r a t o r yBattelle Memorial Institute Columbus 1, Ohio. ABSTRACTThis r e p o r t reviews the effects of the alpha solute interstitials C, 0, and N on the mechanical properties of titanium alloys. These interstitial elements strengthen titanium, although this effect is l o s t a t elevated temperatures. At room temperatures the interstitials have little effect on tensile ductility, but at subzero temperatures they promote embrittlement. They a l s o have a deleterious effect on toughness, notch sensitivity, weld ductility, machinability, and bend ductility.The strengthening effect of either individual o r combined interstitials can be grouped i n t e r m s of an oxygen equivalent. has been found that 0. 1 p e r cent nitrogen is approximately equivalent to 0.2 p e r cent oxygen o r 0. 3 p e r cent carbon. oxygen equivalent becomes It Thus, the oxygen equivalent = %O t 2 x TON t 2 1 3 x %C.The oxygen equivalent is r e l a t e d to hardness as follows: Bhn = 40 t 310 Voxygen equivalent .

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