Method for producing beta type titanium alloy materials having e

Details Method for producing beta type titanium alloy materials having e Method for producing beta type titanium alloy materials having e

1987-09-22

1989-01-24

Roy, Upendra

Metal treatment

Compositions

Heat treating

148 115F, 148133, C22F 118, C22C 1400

Patent

active

047999756

ABSTRACT:
A .beta. type titanium alloy material is passed through processes and heating treatments of cold working--intermediate solution treatment--final cold working--final solution treatment--aging. In this process, a structure, which has been provided with strains by the cold working performed prior to the final cold working, will be changed into a recrystallized structure by carrying out the intermediate solution treatment, where uniform and fine micro substructure of dislocations, remain with grains. If such an intermediate solution-treated material is processed with a slight cold working by the final cold working and further with the solution treatment, only a recovery phenomenon progresses, and it is possible to provide such a micro substructure containing more uniform and finer dislocation network not only in grains but also in grain boundaries. Therefore, in the aging, expedition of precipitation and uniform distribution of .alpha. crystals will be realized in the grains and grain boundary regions, and intergranular cracking is difficult to take place, and alloy materials having high strength and high ductility may be produced.

REFERENCES:
patent: 3156590 (1964-11-01), Vordahl
patent: 3436277 (1969-04-01), Bomberger, Jr. et al.
patent: 3686041 (1972-08-01), Lee
patent: 3794528 (1974-02-01), Rosales et al.
patent: 4600449 (1986-07-01), White et al.
patent: 4675055 (1987-06-01), Ouchi et al.
Avery et al. in Titanium Science & Tech. ed. Jaffee et al., Plenum, N.Y. 1973, vol. 3, p. 1829.

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