Modern structural titanium alloys

Conclusions Further research to increase the strength, service life, and ductility of titanium alloys should be directed toward studying the possibility of heat treatment and thermomechanical treatment, utilization of the metastable structural condition, and intermetallic hardening of the and solid solutions.Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 7, pp. 29–34, July, 1980.     

Network Observability Analysis through Measurement Jacobian Matrix Reduction

A method of observability analysis for the state estimation in power systems is presented. The method is based on a symbolic reduction of the measurement Jacobian matrix without its actual computation. The algorithm is characterized as being extremely simple and fast. The results of the algorithm application in the Energy Management System (EMS) of a large electric utility are given.     

Dispersion strengthening of vanadium alloys with nitrides

Conclusions Additional nitride strengthening of vanadium alloys of the V-Nb-Ti system is a promising means of increasing their high-temperature strength. At temperatures of up to 800°C the V-20% Nb-5% Ti-0.43% N alloy investigated substantially surpasses in strength the majority of existing vandium superalloys. In the press-forged condition VTAN-54 alloy possesses an optimum combination of strength and ductility characteristics. It attains its highest strength in the cold-worked condition after 1-h annealing at 600°C. At service temperatures exceeding 800°C nitride strengthening loses its effectiveness owing to the development of intense strength-loss processes.Translated from Poroshkovaya Metallurgiya, No. 9 (225), pp. 51–55, September, 1981.