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Selective heat treatment of the gearbox component

Kečkowá E., Fabian P., Jarabicowá E.

Archives of Foundry Engineering

2008

Vol. 8, iss. 2

167-169

Nowadays there are setting more and more demanding requests for the products of engineering industry from the points of the parameters of load, durability and reliability. They are followed by higher demands for construction materials with high strength and tough enough as well, with higher wear resistance. Volume isothermal heat treatment of graphitic cast irons is normally used technology at present, what is impossible to say about isothermically heat treated surface layers. The hardness of such structures is lower in comparison with martensitic structure, its toughness is considerably higher. The advantage of isothermal surface heat treatment in comparison with volume heat treatment are most of all economic reasons, which considerably influence on the application of new technologies into the practice. The submitted paper deals with the advantages and disadvantages of selective heat treated parts made of graphitic cast irons. It is experimentally verified the possibility of isothermal surface hardening of cast irons and it is shown the possibility of following usage in practice at concrete parts for automobile industry.