A dissipative process diagram for automotive engine exhaust valve-seat wear has been developed in terms of theoretical analysis, experimental results and micro-structure observations. The diagram describes interconnection of effect of elevated temperature, impact contact stress and exhaust gas corrosion on valve-seat wear. High temperature decreases yield strength of materials, repeated cycle impact contact results in deformation and fatigue of materials, exhaust gas corrosion speeds up the extension of fatigue cracks and produces abrasive wear products. Of these, plastic fatigue damage is a main factor. In the paper, the wear law of the valve-seat is also probed in terms of a simulation wear test.
Material dissipative processes in automotive engine exhaust valve-seat wear
Materialabtragung beim Verschleiß der Auslaßventilsitze von Kraftfahrzeugmotoren
1994
7 Seiten, 10 Bilder, 2 Tabellen, 8 Quellen
Conference paper
English
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