Optimization of microstructure and properties of high strength spring steel

Doctoral thesis (2011)

Authors

Contributors

S. Van der Zwaag (promotor)
Department
Novel Aerospace Materials (Aerospace Engineering) (TU Delft)
Copyright: © 2011 Choi, S.
More Info
expand_more

Published Date

31-01-2011

Reuse Rights

Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.

Faculty

Aerospace Engineering

Department

Novel Aerospace Materials

Abstract

This thesis describes a research project on the development of a new grade of low cost spring steel with exceptional mechanical properties on the basis of a complete understanding and quantification of the metallurgical processes taking place during the various stages of the heat treatment. The new composition in combination with a new 2-step tempering treatment resulted in a steel with a tensile strength in excess of 2400 MPa and a reduction of area for quasi-static tensile fracture of more than 20%.