Open Access
Article Number 05018
Number of page(s) 7
Section Applied Research and Applications: Engineering Materials with MT
Published online 01 September 2009
ESOMAT 2009, 05018 (2009)
DOI: 10.1051/esomat/200905018

Effect of Martensite structure in Graphitization Process in Hypereutectoid steel

S.A. Rounaghi1, A.R. Kiani-Rashid1 and F. Fazeli2

1  Department of Materials Engineering, Ferdowsi University of Mashhad, Mashhad, Iran.
2  Department of Materials Engineering, Faculty of Engineering, The University of British Columbia, Vancouver, BC, Canada.

Published online: 1 September 2009

Graphitization process in steels is referred to the decomposition of meta-stable cementite phase to more stable phases of graphite and ferrite. In steels this transformation often occurs in the range of 600-700 °C. In common commercial steels the occurrence of graphitization process requires long periods of time due to the lack of carbide stabilizer elements such as chromium and manganese. Based on experimental observations, the initial microscopic structure of steels before graphitization has a considerable effect on shortening the time of this phase transformation. In this respect a structure with martensite matrix is identified as one of the best structures for making graphitized steels. However the way of effect and kinetic investigation of graphitization transformation of this structure is less performed by researchers. In this study graphitization behavior from martensite structure in comparison with other structures is investigated by using dilatometric tests, optical microscopic and scanning electron microscope micrographs.

Note to the reader:
On page 05018-p3 several mistakes have been corrected on October 19, 2009.

© Owned by the authors, published by EDP Sciences 2009