Properties and Deformation Mechanism of Aged Fe-Mn-Al-C Steel

doi:10.11901/1005.3093.2020.239

Chinese Journal of Materials Research

2021, Vol. 35

Issue (3): 184-192 DOI: 10.11901/1005.3093.2020.239

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Properties and Deformation Mechanism of Aged Fe-Mn-Al-C Steel

WANG Ping(

), GUO Aimin, HOU Qingyu, GUO Yunxia, HUANG Zhenyi(

), GUANG Jianfeng

School of Metallurgical Engineering, Anhui University of Technology, Ma'anshan 243000, China

Cite this article:

WANG Ping, GUO Aimin, HOU Qingyu, GUO Yunxia, HUANG Zhenyi, GUANG Jianfeng. Properties and Deformation Mechanism of Aged Fe-Mn-Al-C Steel. Chinese Journal of Materials Research, 2021, 35(3): 184-192.

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Abstract

The effect of aging temperature on austenite grain size and mechanical properties of Fe-30Mn-9Al-0.9C-0.45Mo steel were investigated by OM, SEM, XRD, EBSD and TEM. The results show that the aging treatment has a great influence on the microstructure and properties of Fe-30Mn-9Al-0.9C-0.45Mo steel. After aging treatment at 450℃ the tensile strength of the steel is 863 MPa, the elongation after fracture is 56.1%, and the strong plastic product is 48.4 GPa·%, indicating a significant improvement compared with the solid solution treated ones; After aging temperature at 500℃ the amount of the dot-shaped κ-carbide precipitates increases , the austenite grains grow significantly with the increase of ageing temperature and the yield strength and tensile strength increase. During the aging process at 550℃ DO3→B2 continuous transformation occurred, and the yield strength of the steel increased, but the plasticity decreased significantly. After tensile deformation high density dislocation wall and microstrip structure can be observed, which are plane slip characteristics.

Key words: metallic materials Fe-Mn-Al-C steel aging temperature austenite grain microband

Received: 17 June 2020

ZTFLH:

TG142.1

Fund: National Natural Science Foundation of China(51674004)

About author: WANG Ping, Tel: (0555)2311571, E-mail: wangping@ahut.edu.cn

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	Ping WANG
	Aimin GUO
	Qingyu HOU
	Yunxia GUO
	Zhenyi HUANG
	Jianfeng GUANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2020.239 OR https://www.cjmr.org/EN/Y2021/V35/I3/184

Fig.1 Optical micrographs of the experimental steel after solution treated at different aging temperatures for 12 h (a) solid solution state; (b) aged at 450℃; (c) aged at 500℃; (d) aged at 550℃

Fig.2 grain size distribution of austenite in experimental steel after aging at different temperatures (a) aged at 450℃; (b) aged at 500℃; (c) aged at 550℃

Fig.3 EBSD characterizes of the phase distribution of the experimental steel after aging at different temperature (a) 450℃; (b) 500℃; (c) 550℃

Fig.4 Mass fraction of austenite and ferrite and XRD spectra at different aging temperatures

Fig.5 Morphology of ferrite precipitates and XRD spectra of steel aged at 550 ℃

Table 1 Mechanical properties of experimental steel after aging for 12 h at different temperatures

Fig.6 engineering stress-strain curve and mechanical properties of aged steel with aging temperature (a) engineering stress-strain curves; (b) R_m, elongation, R_p0.2, and R_m×elongation

Fig.7 Tensile fracture morphology of experimental steel (a) solid solution; (b) aged at 450℃; (c) aged at 500℃; (d) aged at 550℃

Fig.8 KAM diagram of experimental steel after aging at different temperatures (a) aged at 450℃; (b) aged at 500℃; (c) aged at 550℃

Table 2 Distribution of KAM, average KAMvalue and dislocation density of experimental steel after tensile deformation

Fig.9 TEM image of dislocation structure of experimental steel after tensile deformation (a) microband; (b) dislocation wall

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