The General Motors L850 world engine uses an induction hardened, ductile iron, camshaft. Unlike most induction hardened camshafts that are machined first and then hardened, this camshaft is deep hardened first and then machined. Using this process, the beneficial compressive surface residual stresses are extremely high.During the development of the L850 camshaft, the casting process was optimized to produce material of sufficient quality to resist quench cracking during the hardening process and to resist mechanical cracking during the machining process. Retained austenite content, residual stress profiles, hardness, microstructure and chemical composition were all characterized and optimized.This paper reviews the material and process development for this unique automotive application.
Induction Hardened Ductile Iron Camshafts
Sae Technical Papers
SAE 2002 World Congress & Exhibition ; 2002
2002-03-04
Conference paper
English
Hardening , Iron , Machining processes , Casting , Camshafts
Induction hardened ductile iron camshafts
Automotive engineering | 2002
|2002-01-0918 Induction Hardened Ductile Iron Camshafts
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