Title: Structure and properties of high-speed steels after austempering

Authors: J.A. Kaleicheva

Addresses: Faculty of Machine Technology, Technical University of Sofia, 8, Kliment Ohridski St., Sofia 1000, Bulgaria

Abstract: Some special features of the kinetics and mechanism of the bainitic transformation in high-speed steel HS18-0-1 have been studied. Austempering has been performed at temperatures 300°C and 270°C for 10–360 min, after heating up to 1100°C, 1200°C, and 1280°C. Optical metallographic analysis, electron-microscope analysis, X-ray phase analysis and testing of Rockwell hardness have been carried out. The bainitic transformation at temperatures 270°C and 300°C takes place according to the scheme: α + A_(c). The temperature of heating (1100°C, 1200°C, 1280°C) does not influence the mechanism of bainitic transformation. It changes the kinetic process parameters only.

Keywords: high speed steels; austempering; bainitic ferrite; α-phase; retained austenite; carbides; alpha-phase; material properties; bainitic transformation; kinetics; mechanisms; microstructure.

DOI: 10.1504/IJMMP.2007.012934

International Journal of Microstructure and Materials Properties, 2007 Vol.2 No.1, pp.16 - 23

Published online: 31 Mar 2007 *

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