Effect of Rapid Heat Treatment on Bake Hardening Behavior of a Low Carbon Steel

doi:10.11901/1005.3093.2013.844

Chinese Journal of Materials Research

2014, Vol. 28

Issue (4): 262-268 DOI: 10.11901/1005.3093.2013.844

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Effect of Rapid Heat Treatment on Bake Hardening Behavior of a Low Carbon Steel

Chunfu KUANG^1,²,Shengen ZHANG^1,^**(

),Jun LI²,Jian WANG²,Dechao XU³

1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083
2. Central Research Institute of Baosteel, Shanghai 201900
3. School of Materials and Metallurgy, Northeastern University, Shenyang 110004

Cite this article:

Chunfu KUANG,Shengen ZHANG,Jun LI,Jian WANG,Dechao XU. Effect of Rapid Heat Treatment on Bake Hardening Behavior of a Low Carbon Steel. Chinese Journal of Materials Research, 2014, 28(4): 262-268.

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Abstract

A low carbon steel was firstly annealed with an ultra-rapid heating rate of 200℃/s at 660℃ and 750℃ respectively, then the steel was pre-strained to 2% and finally suffered a baking hardening treatment at 180℃ for 20 min in order to reveal the synergistic effect of the above two heat treatments of the performance of the low carbon steel in terms of heating temperature, soaking time and cooling rate etc. Results indicated that the bake hardening was enhanced with the increase in annealing temperature for the dissolution of the carbides. The BH value of the low carbon steel annealed at 660℃ decreased significantly with increasing soaking time. But the BH value showed a complex variation with soaking time for the steel annealed at 750℃ because the carbides dissolved incompletely during the ultra-rapid heating process: with an increase in soaking time in the range of 0 to 10 s, the BH value made an apparent increment, and then decreased obviously when the soaking time exceeded 10 s. The bake hardening of the steel is enhanced significantly with increasing cooling rate due to the increment of the solute carbon.

Key words: metallic materials rapid heat treatment bake hardening low carbon steel BH value solute carbon atom

Received: 11 November 2013

Fund: *Supported by National Key Project of Scientific and Technical Supporting Programs of China No.2011BAE13B07.

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	Chunfu KUANG
	Shengen ZHANG
	Jun LI
	Jian WANG
	Dechao XU

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https://www.cjmr.org/EN/10.11901/1005.3093.2013.844 OR https://www.cjmr.org/EN/Y2014/V28/I4/262

Table 1 Process parameters of rolling

Fig.1 Method used to measure the BH value

Fig.2 OM and SEM images of the samples in various annealing states R_h=200℃/s, t_s=20 s, R_c=80℃/s, (a, c) T_s=660℃, (b, d) T_s=750℃

Fig.3 Influences of the heating temperature and the soaking time on the BH value

Fig.4 Influence of the cooling rate on the BH value

Fig.5 Distribution of C atoms in the matrix

Fig.6 SEM images of the specimens annealed for 5 s (a), 10 s (b), 60 s (c) and EDS energy spectrum (d) of the carbides

Fig.7 Influence of the soaking time on the solute carbon concentration

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