Effect of Heat Treatment Process on Microstructure and Properties of a 0.1%C-3% Mn Medium Manganese Steel of High-formability

doi:10.11901/1005.3093.2021.300

Chinese Journal of Materials Research

2022, Vol. 36

Issue (5): 343-352 DOI: 10.11901/1005.3093.2021.300

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Effect of Heat Treatment Process on Microstructure and Properties of a 0.1%C-3% Mn Medium Manganese Steel of High-formability

ZHOU Yonglang, WANG Guantao, WANG Lijun(

), LIU Chunming

School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China

Cite this article:

ZHOU Yonglang, WANG Guantao, WANG Lijun, LIU Chunming. Effect of Heat Treatment Process on Microstructure and Properties of a 0.1%C-3% Mn Medium Manganese Steel of High-formability. Chinese Journal of Materials Research, 2022, 36(5): 343-352.

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Abstract

The phase transition behavior of 0.1%C-3%Mn medium manganese steel was studied via thermal simulation with L78RITA automatic phase transformation instrument, meanwhile the effect of one-step and two-step austenite reverted transformation (ART) treatment on the microstructure and mechanical properties of the steel were also investigated. The results show that the two-step ART treatment produces more residual austenite than the one-step ART treatment, which can significantly improve the forming property of the steel. The hot rolled steel samples were pretreated at 740℃ and then heated to different temperatures for ART treatment, and it was found that 12%~14% of the retained austenite could be produced after treatment in temperature range of 660℃~680℃, which made the total elongation higher than 35% and the uniform elongation higher than 20% of the steel respectively. The steel heat treated in conditions of 740℃×0.5 h+670℃×1.0 h has the best comprehensive properties, namely the yield strength is 470 MPa, the tensile strength is 680 MPa, the total elongation is 40.7%, the uniform elongation is up to 25%, and the impact absorption energy is 163 J.

Key words: metallic materials medium manganese steel two-step ART treatment microstructure mechanical properties retained austenite

Received: 11 May 2021

ZTFLH:

TG142

Fund: National Natural Science Foundation of China(51571053)

About author: WANG Lijun, Tel: (024)83691575, E-mail: lijunwang@mail.neu.edu.cn

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	Yonglang ZHOU
	Guantao WANG
	Lijun WANG
	Chunming LIU

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https://www.cjmr.org/EN/10.11901/1005.3093.2021.300 OR https://www.cjmr.org/EN/Y2022/V36/I5/343

Table 1 chemical composition of experimental steel (mass fraction, %)

Fig.1 Microstructures of hot-rolled plate (a) and microstructures (b) and dilatation curve (c) of thermal dilatation simulation sample after cooling at 0.5℃/s, during cooling stage revealing the phase transiformation

Fig.2 Thermal dilatation curves and microstructures of samples treated at different temperature for 1.5 h (a) thermal dilatation curve and (b) microstructure for 660℃, (c) thermal dilatation curve and (d) microstructure for 680℃

Fig.3 Microstructure of experimental steel after ART annealing at 670℃×2.0 h

Fig.4 Microstructure of sample treated by the two-step ART pre-treatment (a) 720℃×1.0 h, (b) 740℃×1.0 h; and (c) the thermal dilatation curve during the cooling process after 740℃×1.0 h

Fig.5 Microstructures of sample treated by two-step ART treatment (a) pretreatment at 740℃×0.5 h, (b) 740℃×0.5 h+650℃×1.0 h, (c) 740℃×0.5 h+660℃×1.0 h, (d) 740℃×0.5 h+670℃×1.0 h, (e) 740℃×0.5 h+680℃×1.0 h, (f) 740℃×0.5 h→670℃×1.0 h

Heat treatment	$V A r$ /%	$C γ$ /%	R_p0.2 /MPa	R_m /MPa	A_t /%	A_u /%	A_kv /J	PSE /GPa·%
740℃×0.5 h+650℃×1.0 h	6.7	0.67	503	668	34.0	17.0	>250	22.71
740℃×0.5 h+660℃×1.0 h	12.5	0.71	492	681	40.7	24.0	>250	27.72
740℃×0.5 h+670℃×1.0 h	14.1	0.70	476	686	40.7	25.0	229	27.92
740℃×0.5 h+680℃×1.0 h	14.4	0.72	487	788	37.3	22.0	163	29.39
740℃×0.5 h→670℃×1.0 h	1.7	0.61	531	1000	20.5	10%	28	20.53

Table 2 Retained austenite content, carbon content of retained austenite and mechanical properties of experimental steel treated by two-step ART treatment

Fig.6 Stress-strain curve of the specimens treated by two-step ART treatment

Fig.7 Phase map (a) for BCC (red) and FCC (blue) phases, inverse pole figure (IPF) map (b) of sample subjected to two-step ART treatment: 740℃×0.5 h+670℃×1.0 h

Fig.8 TEM images after heat treatment of 740℃×0.5 h+670℃×1.0 h (a) bright field image and (b) dark field image showing blocky austenite (γ_B), (c) bright field image and (d) dark field image showing lathy austenite (γ_L)

Fig.9 STEM image (a) and EDS mapping (b) of Mn in sample treated by 740℃×0.5 h+670℃×1.0 h

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