Integral engine valves made from titanium alloy bars of specifie

Details Integral engine valves made from titanium alloy bars of specifie Integral engine valves made from titanium alloy bars of specifie

1996-07-24

1997-09-02

Engel, James

Metal treatment

Process of modifying or maintaining internal physical...

Carburizing or nitriding using externally supplied carbon or...

148217, 148317, 148281, 4284721, 1231583, 251368, F01L 304, C23C 802

Patent

active

056627459

ABSTRACT:
Bars of titanium alloys suited for the manufacture of at least the stems (2), (3) of engine valves are mass-producible while maintaining good configurational and dimensional accuracies throughout the valve fabricating process and the wear-resistance imparting processes to at least the stems (2), (3), 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 .mu.m, an acicular .alpha.-phase consisting of acicular .alpha. crystals having a width of not smaller than 1 .mu.m and dispersed with equiaxed .alpha. crystals, and an equiaxed .alpha.-phase consisting of .alpha. crystals whose diameter is not smaller than 6 .mu.m. 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 .mu.m and the width of the acicular .alpha. crystals is not smaller than 1 .mu.m and not larger than 4 .mu.m. Selection of these alloys assures very efficient manufacture.

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