Titanium engine valve and method of making

Details Titanium engine valve and method of making Titanium engine valve and method of making

C - Chemistry, Metallurgy

21

D

171/64, 148/35.7

C21D 8/00 (2006.01) B23P 15/00 (2006.01) C22F 1/18 (2006.01) F01L 1/00 (2006.01) F01L 3/02 (2006.01)

Patent

CA 1272432

Abstract A method is disclosed for making a dual microstructure titanium based engine valve, wherein a first zone of the valve contains essentially a mixture of fine, equiaxed alpha and transformed beta crystalline grains which exhibit high tensile strength and high fatigue resistance, and a second zone of the valve which contains essentially a colony type microstructure exhibiting resistance to high temperature creep. The method comprises: (a) preparing a valve stock of forgeable mixed phase alpha/beta titanium based material; (b) hot working said first zone at a temperature below the beta transus temperature, (c) forging said second zone and, either simultaneously with said forging or subsequent thereto, heat treating said second zone at a temperature above (e.g., 25-200°F above) the beta transus temperature for a period of time to achieve beta processing followed by cooling to 1400°F at a rate of .1-10.0°F/second; and (d) heat treating, immediately subsequent to either step (b) or step (c), at least the first zone at a temperature below the beta transus teperature (e.g., 25-200°F below) for a period of time to achieve alpha/beta processing.

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