Process for imparting high strength, ductility, and toughness to

Details Process for imparting high strength, ductility, and toughness to Process for imparting high strength, ductility, and toughness to

1998-06-12

2000-10-24

Wyszomierski, George

Metal treatment

Process of modifying or maintaining internal physical...

Treating consolidated metal powder, per se

148668, 148673, 419 28, 419 47, B22F 100

Patent

active

061361054

ABSTRACT:
A method of imparting high strength, high ductility, and high fracture toughness to a refractory metal alloy workpiece includes: (i) subjecting the workpiece to at least one pass that reduces the initial cross-sectional area of said workpiece, (ii) annealing the workpiece subsequent to the at least one pass, and (iii) subjecting the workpiece to a final working step comprising at least one pass conducted at a temperature between ambient and 300.degree. C., the final working step further reducing the cross-sectional area of the workpiece such that the total reduction in the initial cross-sectional area of the workpiece is approximately 40%-75% and the final cold working is 0.30 to 0.75 of the total reduction in cross-sectional area. The resulting article has a tensile yield strength of approximately 170-200 Ksi, a tensile elongation of approximately 12%-17%, and a Charpy 10 mm Smooth Bar impact toughness of approximately 100 ft.-lb. to 240 ft.-lb.

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Metals Handbook, Ninth Edition, vol. 14, "Forming and Forging", ASM International Handbook Committee, Apr., 1996.

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