Wear-resistant camshaft and method of producing the same

US6398881B1 · kind B1 · utility

Assignee

• Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE

Inventors

• Berndt Brenner · Heidenau, DE
• Carsten Duschek · Dresden, DE
• Andreas Wetzig · Dresden, DE
• Dietmar Naunapper · Oberrimsingen, DE

Key dates

• Filing date: May 19, 1999
• Grant date: Jun 4, 2002
• Expiry date: May 19, 2019

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S148/902
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention concerns a wear-resistant camshaft and a method of producing the same. Objects in which the application of the invention is possible and useful are all cast-iron parts which are subject to wear as a result of lubricated friction. The wear-resistant camshaft consists of cast-iron and it has a surface layer consisting of a ledeburitic remelted layer with a high cementite portion, and, lying thereunder, a martensitic hardening zone, whereby according to the invention.a. the remelted layer consists of finely dispersed ledeburitic cementite with thicknesses of ≦1 &mgr;m and a metallic matrix of a phase mixture of martensite and/or bainite, residual austenite, as well as less than 20% finely laminated pearlite with a distance of ≦0.1 &mgr;m between the lamelias, andb. the hardening layer is formed from a phase mixture of martensite and/or bainite, partially dissolved pearlite, and residual austenite.This wear-resistant camshaft according to the invention is produced by means of a high-energy surface remelting method.