Ultra-Hard Bainitic Steels Processed through Low Temperature Heat Treatment

Abstract:

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Relative high carbon steel bearing Cr and Mo with microstructure consisting of nanoscaled bainitic laths and certain amount of retained austenite was produced through the combination of rolling and isothermal/multi-step heat treatment at low temperatures. The effect of the heat treatment temperature, time and path on the volume fraction of retained austenite and the width of bainitic lath was investigated. Nanoindentation was applied to inspect the separate hardness of the tiny bainite and retained austenite for different heat treatment parameters. The results showed that bainitic lath treatedt at 250°C was much thinner than that at 300°C and the volume fraction of retained austenite changed with different heat treatment temperatures, time and paths. The nanohardness of the baintic lath and retained austenite also changed with the processing of both carbon partitioning and displacive transformation for different heat treatment paths.

Info:

Periodical:

Advanced Materials Research (Volumes 156-157)

Edited by:

Jingtao Han, Zhengyi Jiang and Sihai Jiao

Pages:

1708-1712

DOI:

10.4028/www.scientific.net/AMR.156-157.1708

Citation:

H. F. Lan et al., "Ultra-Hard Bainitic Steels Processed through Low Temperature Heat Treatment", Advanced Materials Research, Vols. 156-157, pp. 1708-1712, 2011

Online since:

October 2010

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Price:

$35.00

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