Conveyor Belt Furnace Thermal Processing by Jinlong Xu Joyce Zhang & Ken Kuang

Author:Jinlong Xu, Joyce Zhang & Ken Kuang
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

The open and close of valves are decided by the cylinder piston positions. A detailed explanation by Marshall Brain on how engine works can be found at http://​auto.​howstuffworks.​com/​engine4.​htm.

Engine Valve Heat Treatment Description

The working conditions of engine valves are severe. Doug Kaufman states that intake valves typically run at the range of 800–1000 °F(427–538 °C), while exhaust valves typically run at 1200–1450 °F(649–788 °C), due to the temperature difference of intake gas and exhaust. Besides high temperature, valve also experiences cyclic loading. A valve can open and close dozens of times per second.

Because of the high working temperature and strength required in such conditions, heat-resistant steels are often used. Besides proper material selection, proper heat treatment is essential in manufacturing high performance engine valves. It is vital to create the desired properties like strength, wear resistance, toughness, fatigue strength, hardness, and microstructure.

Normal heat treating methods include annealing, normalizing, tempering, and hardening. To decide a specific heat treatment process, alloy phase diagram (Fig. 2) is the fundamental tool.

Fig. 2.Fe-C phase diagram (Courtesy of online source http://​www.​calphad.​com/​iron-carbon.​html)

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