E. J. Czyryca, Naval Surface Warfare Center, Carderock Division, West Bethesda, MD
Titanium and its alloys are finding increasing applications on U.S. Navy surface ships and submarines. The physical, mechanical and corrosion properties of titanium favorably impact current U.S. Navy ship design requirements for increased reliability with reduced maintenance, reduced weight, and shock integrity. Based on the excellent erosion-corrosion properties of titanium, commercially pure grades are used extensively for seawater pumps, cooling and piping applications on surface ships and for a number of seawater system components on submarines. For high-strength critical applications, the US Navy is using Ti-5Al-1Sn-1Zr-1V-0.8Mo (Ti-5111) alloy in lieu of Ti-6Al-4V ELI due to its high toughness, weldability, and seawater stress corrosion cracking resistance.
This presentation will describe the advantages of titanium in ship applications and systems where the use of titanium is service proven. The focus will be on the results of studies to characterize the strength, fracture toughness, fatigue, and seawater corrosion/stress corrosion resistance properties of the Ti-5111 alloy, including the results of fracture testing under dynamic conditions. The characterization of Ti-5111 products has included evaluation of plate for ¼ to 2 inches thick, rod, bar, forgings, and castings. One and two inch thick weldments were fabricated by the gas tungsten arc welding process using standard titanium joint preparation and shielding techniques. The results of tensile, fracture toughness, and seawater corrosion/stress corrosion resistance tests demonstrated that Ti 5111 welds possess high strength, good fracture toughness and excellent resistance to seawater corrosion. In addition, the presentation will describe current and candidate applications of this alloy for Navy combatant ships.
Summary: Titanium and its alloys are finding increasing applications on U.S. Navy surface ships and submarines. The physical, mechanical and corrosion properties of titanium favorably impact current U.S. Navy ship design requirements for increased reliability with reduced maintenance, reduced weight, and shock integrity. Based on the excellent erosion-corrosion properties of titanium, commercially pure grades are used extensively for seawater pumps, cooling and piping applications on surface ships and for a number of seawater system components on submarines. For high-strength critical applications, the US Navy is using Ti-5Al-1Sn-1Zr-1V-0.8Mo (Ti-5111) alloy in lieu of Ti-6Al-4V ELI due to its high toughness, weldability, and seawater stress corrosion cracking resistance.
This presentation will describe the advantages of titanium in ship applications and systems where the use of titanium is service proven. The focus will be on the results of studies to characterize the strength, fracture toughness, fatigue, and seawater corrosion/stress corrosion resistance properties of the Ti-5111 alloy, including the results of fracture testing under dynamic conditions. The characterization of Ti-5111 products has included evaluation of plate for ¼ to 2 inches thick, rod, bar, forgings, and castings. One and two inch thick weldments were fabricated by the gas tungsten arc welding process using standard titanium joint preparation and shielding techniques. The results of tensile, fracture toughness, and seawater corrosion/stress corrosion resistance tests demonstrated that Ti 5111 welds possess high strength, good fracture toughness and excellent resistance to seawater corrosion. In addition, the presentation will describe current and candidate applications of this alloy for Navy combatant ships.
