Abstract— As our project concerned it is basically concentrate on "To study the heat treatment on the structure and properties of automobile gears, which consist of hardening and carburizing process which is a case hardening process". Case hardening is the process of hardening the surface of metal, often low carbon steel by infusing elements into the metal surface forming a hard, wear resistance skin but preserving a tough and ductile applied to gears. The hardening treatment for most steels consists of heating the steel to a set temperature and then cooling it rapidly by plunging it into oil, water. EN 8 and EN 353 steel is an easily available and cheap material that is acceptable for heavy duty applications. Heat treatment on EN 8 and EN 353 steel is improved the hardness and relive internal stress in the material. The experimental results of hardness and microstructure are done to get idea about heat treated materials. It is found that the hardness of the materials are improved after the heat treatment and the microstructure is changed from austenite to martensite.

Index Terms— EN 8 and EN 353 steel, Heat treatment, Hardness, Microstructure

Cite: S Sathish kumar, B Shiva, and V Nachimuthu, " Heat Treatment on En 8 & En 353 for Heavy Duty Gears," International Journal of Mechanical Engineering and Robotics Research, Vol. 3, No. 2, pp. 245-250, April 2014.