Abstract
Service experience and also special investigations have shown that moist air, water, and aqueous solutions of many substances substantially reduce the fatigue life of constructional materials and, in particular, the resistance to crack development [1-4]. Inhibiting of the medium may be one of the effective and simple methods of protecting metal parts from corrosion-fatigue fracture. However, despite the wide use of corrosion inhibitors, data on their influence on fatigue crack growth is limited. There is information on insignificant retarding of crack growth in high-strength steels by inhibitors of acid corrosion in electrolyte solutions in long-term loading [5, 6]. It is also known that the use of lutidines increases the resistance to fatigue crack growth of 40Kh steel in a hydrogen sulfide medium [7]. We have investigated the influence of moist air, distilled water, and its inhibiting by various types of additions on fatigue fracture curves of V95 high-strength aluminum alloy and 65G steel (Table i), The V95 alloy was hardened by heating to 470~ and water quenching and then aged at 120~ for 5 h and at 165~ for 15 h (TI cycle) or 25 h (T3 cycle) with water cooling. The 65G steel samples were oil hardened from 810~ and tempered at 580~ for 2 h with water cooling.
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