Titanium alloy bar suited for the manufacture of engine valves

Details Titanium alloy bar suited for the manufacture of engine valves Titanium alloy bar suited for the manufacture of engine valves

C - Chemistry, Metallurgy

22

C

C22C 14/00 (2006.01) C22F 1/18 (2006.01) F01L 3/02 (2006.01)

Patent

CA 2119022

Bars of titanium alloys suited for the manufacture of engine valves are mass-producible while maintaining good configurational and dimensional accuracies throughout the valve fabricating process and the wear-resistance imparting processes by surface oxidizing and nitriding. The alloys are of the .alpha.+.beta. type whose microstructure consists of any of an acicular .alpha.-phase consisting of acicular .alpha. crystals having a width of not smaller than 1 µm, an acicular .alpha.-phase consisting of acicular .alpha. crystals having a width of not smaller than 1 µm and dispersed with equiaxed .alpha. crystals, and an equiaxed .alpha.-phase consisting of a crystals whose diameter is not smaller than 6 µm. Their microstructure may also include one in which the diameter of the pre-.beta. crystals in the acicular .alpha.-phase is not larger than 300 µm and the width of the acicular a crystals is not smaller than 1 µm and not larger than 4 µm. Selection of these alloys assures very efficient manufacture.

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