Titanium engine valve and method of making

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

1987-01-27

1988-03-08

Chambers, A. Michael

Valves and valve actuation

Valve

Materials

123188AA, F01L 300

Patent

active

047295465

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.degree.-200.degree. F. above) the beta transus temperature for a period of time to achieve beta processing followed by cooling to 1400.degree. F. at a rate of 0.1.degree.-10.0.degree. 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 temperature (e.g., 25.degree.-200.degree. F. below) for a period of time to achieve alpha/beta processing.

REFERENCES:
patent: 1503772 (1924-08-01), Smith
patent: 1981898 (1934-11-01), Boegehold et al.
patent: 2048166 (1936-07-01), Pilling et al.
patent: 4269391 (1981-05-01), Saito et al.

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