IMPROVING FORMABILITY OF WROUGHT COPPER-NICKEL-TIN ALLOYS Russian patent published in 2018 - IPC C22F1/08 

FIELD: technological processes.

SUBSTANCE: invention relates to methods of thermal stress treatment of spinodal copper-nickel-tin alloys improving their formability. Method of thermal stress treatment of a cast wrought spinodal copper-nickel-tin alloy having an offset yield strength that is at least 115 ksi comprises performing a first mechanical cold working step on a copper-nickel-tin alloy to a percentage of cold working (%CW) of about 5 % to 15 % and relieving stress in the alloy through a heat treatment step, which is performed at a temperature in the range of 700 °F to 950 °F for a period of about 3 minutes to about 12 minutes. According to the second version, it is possible to perform a second cold working step with a %CW of about 4 % to about 12 %, after the first additional heat treatment step at 450–550 °F for 3–5 hours.

EFFECT: resulting alloy has both a good formability ratio and good offset yield strength.

18 cl, 4 ex, 5 tbl, 4 dwg