Thermo-mechanical processing of nickel-titanium alloys

摘要

Processes for the production of nickel-titanium mill products are disclosed. A nickel-titanium alloy workpiece is cold worked at a temperature less than 500° C. The cold worked nickel-titanium alloy workpiece is hot isostatic pressed (HIP'ed).

主权项

1. A process for the production of a nickel-titanium mill product comprising:
hot forging a nickel-titanium alloy ingot at a temperature greater than or equal to 500° C. to produce a nickel-titanium alloy billet; hot bar rolling the nickel-titanium alloy billet at a temperature greater than or equal to 500° C. to produce a nickel-titanium alloy workpiece; cold drawing the nickel-titanium alloy workpiece at a temperature less than 500° C. to produce a nickel-titanium alloy bar; and hot isostatic pressing the cold worked nickel-titanium alloy bar for at least 0.25 hour in a HIP furnace operating at a temperature in the range of 700° C. to 1000° C. and a pressure in the range of 3,000 psi to 50,000 psi.