A Study on Cu and Nb Precipitation during High Temperature Tempering in Low Carbon Steels

Hui Guo; Xiao Ran Sun; Shan Wu Yang; Xue Min Wang; Cheng Jia Shang

doi:10.4028/www.scientific.net/AMR.430-432.453

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 430-432A Study on Cu and Nb Precipitation during High...

A Study on Cu and Nb Precipitation during High Temperature Tempering in Low Carbon Steels

Abstract:

The microstructure evolution and precipitation behavior of two low carbon steels are studied, with 0.05C-0.77%Nb added in one steel and (0.03C-)1.63Cu-0.74%Nb added in the other as a comparison. In the Cu-Nb steel tempered at 600°C for 18 hrs, there are two peaks in the particle size distribution figure, one between 2-3nm formed by NbCN precipitates, and the other, 10-12nm for Cu precipitates. The TEM observation on carbon replica shows that the average particle diameter of NbCN precipitate is 2.81±0.78nm in C-Nb steel, while 4.23±0.95 nm in Cu-Nb steel with lower carbon. The analysis shows that this size increase of NbCN not only decreases the precipitation strengthening, but also weakens significantly the pinning effect on the dislocations, which results in a more serious microstructure softening in Cu-Nb steel.

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Periodical:

Advanced Materials Research (Volumes 430-432)

Pages:

453-457

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.430-432.453

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Online since:

January 2012

Authors:

Hui Guo, Xiao Ran Sun, Shan Wu Yang, Xue Min Wang, Cheng Jia Shang

Keywords:

Cu Precipitates, Low Carbon Steel, NbCN Precipitates, Tempering

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