Solution heat treatment of engine poppet valves and valves made

Details Solution heat treatment of engine poppet valves and valves made Solution heat treatment of engine poppet valves and valves made

1986-10-27

1988-04-12

Zimmerman, John J.

Metal treatment

Compositions

Heat treating

148145, 148149, 148902, 148320, 148426, 123188AA, C21D 126, F01L 302

Patent

active

047372010

ABSTRACT:
An engine poppet valve is manufactured to have a microstructure that varies by location to match the stresses, temperature, wear and other conditions encountered in service. The microstructure is characterized by a coarse grain size in the head adjacent its combustion face, a fine grain size in the head adjacent its seat face, and a fine grain size in the stem.

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patent: 4345950 (1982-08-01), O'Hara
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