Effect of Aging Treatment on Microstructure Evolution and Mechanical Properties of Fe-12Mn-8Al-1C-3Cu Lightweight Steel

doi:10.11901/1005.3093.2023.270

Chinese Journal of Materials Research

2024, Vol. 38

Issue (5): 356-364 DOI: 10.11901/1005.3093.2023.270

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Effect of Aging Treatment on Microstructure Evolution and Mechanical Properties of Fe-12Mn-8Al-1C-3Cu Lightweight Steel

LIU Jiaxiao¹^,², HU Xiao¹^,², DING Hua¹^,²(

)

^1.School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
^2.Key Laboratory of Lightweight Structural Materials, Liaoning Province, Northeastern University, Shenyang 110819, China

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LIU Jiaxiao, HU Xiao, DING Hua. Effect of Aging Treatment on Microstructure Evolution and Mechanical Properties of Fe-12Mn-8Al-1C-3Cu Lightweight Steel. Chinese Journal of Materials Research, 2024, 38(5): 356-364.

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Abstract

By aging treatment of a medium manganese lightweight steel at 550^oC, the evolution of its microstructure and mechanical properties was analyzed. The results indicate that aging treatment has a significant impact on precipitates. When the aging time is less than 30 minutes, a large number of intragranular κ'-carbides formed by spinodal decomposition, which distributed dispersedly in the austenite matrix. As the aging time increases, besides the intragranular κ'-carbides, intergranular κ-carbides are also formed at grain boundaries through eutectoid reactions as a layered structure of α ferrite and κ-carbide. Intragranular κ'-carbides greatly increase the strength, but intergranular κ-carbides significantly reduce the ductility of the steel. Compared with long-time aging, the strength of the steel can be significantly increased by short-time aging, while the steel still maintains a high elongation with better overall mechanical properties. Among them, the good performance is achieved for the steel after aging for 30 minutes, namely a tensile strength of 1031 MPa, yield strength of 784 MPa, an elongation of 41.08%, and a product of strength and elongation of 42.35 GPa·%.

Key words: metallic materials lightweight steel aging treatment microstructural evolution strain hardening dislocation slip

Received: 30 May 2023

ZTFLH:

TG142.1

Fund: National Natural Science Foundation of China(U1760205)

Corresponding Authors: DING Hua, Tel: (024)23604263, E-mail: dingh@smm.neu.edu.cn

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https://www.cjmr.org/EN/10.11901/1005.3093.2023.270 OR https://www.cjmr.org/EN/Y2024/V38/I5/356

Table 1 Actual compositions of experimental steels (mass, %)

Fig.1 Schematic illustration of the thermomechanical process(CR: cold rolling; HR: hot rolling; WQ: water cooling)

Fig.2 XRD profiles of the experimental steel aged at 550^oC for different time

Fig.3 SEM microstructures of the experimental steel aged at 550^oC for different time (a) 0 min, (b) 10 min, (c) 30 min, (d) 60 min, (e) 300 min, (f) 900 min

Table 2 Average size of austenite grains after heat treatment for different time

Fig.4 TEM of experimental steels aged at 550^oC for different times (a) 10 min, (b) 60 min, (c) 300 min, (d) 900 min, (e) intergranular κ-carbides aged about 900 min, (f, g) the TEM and EDS of the Cu-rich precipitate aged about 30 min

Fig.5 Representative engineering stress-strain curves (a) and the variation of mechanical properties (b) of the experimental steel aged at 550^oC for different time

Fig.6 TEM morphology of deformation structure of the experimental steel aged at 550^oC for 10 min with different deformation extents (a) 5 %; (b) 10%; (c) 20%; (d) 30%; (e) 40%

Fig.7 EBSD analysis of the experimental steel aged at 550^oC for 300 min (a) the K-S and N-W relationships of all phase boundary after aging 300 min; (b) the K-S and N-W relationships of intergranular κ-carbide vs. austenite/ferrite at grain boundaries

Fig.8 Relationship between strain hardening rate and true strain of the experimental steels

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