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Advances in Materials Science and Engineering
Volume 2016, Article ID 9807685, 7 pages
http://dx.doi.org/10.1155/2016/9807685
Research Article

Effects of Heat-Treatment on the Microstructure and Wear Resistance of a High-Chromium Cast Iron for Rolls

1Key Lab of Metastable Materials Science & Technology and College of Material Science & Engineering, Yanshan University, Qinhuangdao 066004, China
2Hebei Key Laboratory of Material Near-Net Forming Technology and College of Material Science and Engineering of Hebei University of Science and Technology, Shijiazhuang 050000, China
3Xingtai Zheng Kun Machinery & Mill Roll Co. Ltd., Xingtai 055450, China

Received 14 June 2016; Revised 17 August 2016; Accepted 1 September 2016

Academic Editor: Katsuyuki Kida

Copyright © 2016 Zhi-hong Guo et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The variations of microstructure and mechanical properties of a high-chromium cast iron for rolls were studied from as-cast to the final heat treatments. Results show that the as-cast microstructure of the HCCI consists of M7C3 carbide, M23C6 carbide, martensite matrix, and retained austenite. The large dendritic M7C3 carbide surrounds the matrix, and the M23C6 carbide is mainly distributed in the matrix. Part of M23C6 carbide transforms to M7C3 carbide and is dissolved in austenite during austenization at 1020°C. Thus, the amount of M23C6 carbide decreases, whereas that of M7C3 carbide increases after quenching; the highest hardness is also obtained. After tempering, the martensite transforms to a tempered martensite, and some carbide precipitates in the martensite matrix. The hardness also changes from HRC62.1, which corresponds to quenching, to HRC55.2 and HRC56.3, which correspond to once and twice tempering, respectively. However, tempering could improve the impact toughness and wear resistance of the HCCI.