Microstructure Evolution and Dynamic Recrystallization of a Low Density Steel during Isothermal Compression

doi:10.11901/1005.3093.2024.082

Chinese Journal of Materials Research

2024, Vol. 38

Issue (10): 768-781 DOI: 10.11901/1005.3093.2024.082

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Microstructure Evolution and Dynamic Recrystallization of a Low Density Steel during Isothermal Compression

SUN Jian¹^,²(

), LI Jinghui², HUANG Zhenyi², ZHANG Xiaofeng², WANG Dongsheng¹, LIU Shuqing¹

^1.School of Mechanical Engineering, Tongling University, 244061 Tongling, China
^2.School of Metallurgical Engineering, Anhui University of Technology, 243002 Ma'anshan, China

Cite this article:

SUN Jian, LI Jinghui, HUANG Zhenyi, ZHANG Xiaofeng, WANG Dongsheng, LIU Shuqing. Microstructure Evolution and Dynamic Recrystallization of a Low Density Steel during Isothermal Compression. Chinese Journal of Materials Research, 2024, 38(10): 768-781.

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Abstract

A low-density steel Fe-29.96Mn-9.56Al-1.01C was isothermal compressed in a temperature range of 850~1100^oC and strain rate range of 0.01~10 s^-1, meanwhile, the microstructure evolution and dynamic recrystallization process of the steel were studied by OM, EBSD and TEM. On this basis, the corresponding constitutive equation of the steel is constructed based on strain compensation, and the effect of Z parameter on the dynamic recrystallization of the steel was analyzed. The results show that the conditions of low temperature and high strain rate are beneficial to the formation of fine dynamic recrystallization grains, but the recrystallization is not sufficient. In comparison, the conditions of decreasing strain rate while increasing temperature are more favorable to the completion of the dynamic recrystallization process of the steel. The Z-value has an important relationship with the dynamic recrystallization of the steel, i.e. the deformation condition of high temperature and low strain rate is conducive to the recrystallization and the grain growth for the steel with low Z-value. For the steel with middle and high Z values of, the same condition may be conductive to the formation of fine dynamic recrystallization grains, the retention of the original band-structure, and thereby a low degree of recrystallization. The grain boundary orientation difference of the steel shows a bimodal structure during thermal deformation. The main dynamic recrystallization mechanism of the steel is discontinuous dynamic recrystallization. The degree of continuous dynamic recrystallization and geometric dynamic recrystallization is weak under different thermal compression conditions.

Key words: foundational discipline in materials science Fe-Mn-Al-C low density steel isothermal compression microstructure evolution dynamic recrystallization

Received: 19 February 2024

ZTFLH:

TG142.1

Fund: National Natural Science Foundation of China(51674004);National Natural Science Foundation of China(51805002);Anhui Provincial Natural Science Research Key Program of Higher Education Institutions(2022AH051760);Tongling University Natural Science Research Project(2023tlxy05);Tongling University Natural Science Research Project(2023tlxy03);Tongling University Natural Science Research Project(2017tlxy23);Key Laboratory of Construction Hydraulic Robots of Anhui Higher Education Institutes, Tongling University(TLXYCHR-O-21YB03)

Corresponding Authors: SUN Jian, Tel: (0562)5882096, E-mail: sjxa0913@163.com

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	LI Jinghui
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https://www.cjmr.org/EN/10.11901/1005.3093.2024.082 OR https://www.cjmr.org/EN/Y2024/V38/I10/768

Fig.1 True stress-true strain curves of low density steels at different deformation condition: (a) 0.01 s^-1; (b) 1100^oC

Table 1 Material parameters under different strains

Alloy	T / ^oC	$ε ˙$ / s^-1	Phase	n	α / mm^-2·N^-1	Q / kJ·mol^-1	References
Fe-27Mn-11.5Al-0.95C	900~1150	0.01~10	γ + δ	3.93	0.0035	294.20	[11]
Fe-27.34Mn-8.63Al-1.03C	900~1150	0.01~5	γ	4.24	0.0107	422.88	[25]
Fe-25.14Mn-10Al-1.46C	900~1150	0.01~10	γ	5.14	0.0060	669.84	[34]
Fe-29.96Mn-9.56Al-1.01C	850~1100	0.01~10	γ	4.01~6.63	0.0041~0.0054	331.76~415.30	Present work

Table 2 Data for phase composition, material constants (n, α), and activation energy of hot deformation for low density steels

Fig.2 Plot of fitting the low density steel true strain ε to α, n, Q and lnA, respectively

Table 3 The 6th polynomial coefficients of material parameters α, n, Q and lnA

Fig.3 Comparisons between predicted and measured values of flow stress for low density steel under different hot compression conditions

Fig.4 Comparison of measured flow stress and predicted flow stress of low density steel under different deformation conditions

$ε ˙$ / s^-1	lnZ
$ε ˙$ / s^-1	850^oC	900^oC	950^oC	1000^oC	1050^oC	1100^oC
0.01	38.2	36.4	34.7	33.2	31.8	30.4
0.1	40.5	38.7	37.0	35.5	34.1	32.7
1	42.8	41.0	39.3	37.8	36.4	35.0
10	45.1	43.3	41.6	40.1	38.7	37.3

Table 4 lnZ values under different strain rates and deformation temperatures

Fig.5 Schematic diagram for distinguishing Z-parameter values of low density steel

Fig.6 Microstructure of low density steel after thermal compression with Z value in the range of zone I ( $ε$ = 0.9): (a) 1nZ = 31.8; (b) 1nZ = 30.4

Fig.7 Microstructure of low density steel after thermal compression with Z value in the range of zone Ⅱ ( $ε$ = 0.9) (a) 1nZ = 39.3; (b) 1nZ = 37.8

Fig.8 Microstructure of low density steel after thermal compression with Z value in the range of zone Ⅲ (ε = 0.9) (a) 1nZ = 45.1; (b) 1nZ = 43.3

Fig.9 Relationship between lnZ and deformation parameters

Fig.10 (a) relationship curve between lnZ and critical strain; (b) relationship curve between lnZ and critical stress

Fig.11 Inverse pole figure of thermal deformation structure of low density steel (a) lnZ = 31.8; (b) lnZ = 34.1; (c) lnZ = 37.0;(d) lnZ = 39.3; (e) lnZ = 41.0; (f) lnZ = 42.8

Fig.12 Grain boundary diagram of thermal deformation structure of experimental steel (a) lnZ = 31.8; (b) lnZ = 34.1; (c) lnZ = 37.0; (d) lnZ = 39.3; (e) lnZ = 41.0; (f) lnZ = 42.8 (In the figure, the black line indicates the large angle grain boundary > 15°, the blue line indicates the grain boundary 10°~15°, and the red line indicates the grain boundary < 10°)

Fig.13 Boundary misorientation angle distribution of thermal deformed microstructure of experimental steel (a) lnZ = 31.8; (b) lnZ = 34.1; (c) lnZ = 37.0; (d) lnZ = 39.3; (e) lnZ = 41.0; (f) lnZ = 42.8

Fig.14 Volume fraction of dynamic recrystallization under different Z-values

Fig.15 TEM image of thermal deformation structure of low density steel (a) lnZ = 31.8; (b) lnZ = 34.1; (c) lnZ = 37.0; (d) lnZ = 39.3; (e) lnZ = 41.0; (f) lnZ = 42.8

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