Synergistic Effect of Magnetic Field and Grain Size on Martensite Nucleation and Variant Selection

doi:10.11900/0412.1961.2021.00204

Acta Metall Sin

2022, Vol. 58

Issue (12): 1570-1580 DOI: 10.11900/0412.1961.2021.00204

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Synergistic Effect of Magnetic Field and Grain Size on Martensite Nucleation and Variant Selection

YUAN Jiahua¹, ZHANG Qiuhong², WANG Jinliang³, WANG Lingyu¹, WANG Chenchong¹, XU Wei¹(

)

^1.State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China
^2.School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China
^3.School of Mechanical and Power Engineering, Guangdong Ocean University, Zhanjiang 524088, China

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YUAN Jiahua, ZHANG Qiuhong, WANG Jinliang, WANG Lingyu, WANG Chenchong, XU Wei. Synergistic Effect of Magnetic Field and Grain Size on Martensite Nucleation and Variant Selection. Acta Metall Sin, 2022, 58(12): 1570-1580.

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Abstract

Extrinsic (magnetic fields) and intrinsic (austenite grain sizes) factors can effectively control the martensitic transformation. Until now, research has mainly focused on the separate effects of magnetic fields and austenite grain sizes on the kinetics of the martensitic transformation. Systematic studies considering the coupling effects of magnetic fields and austenite grain sizes on the temperature at which martensite is formed (M_s), the final volume fraction of the transformed martensite, and the kinetics of the martensitic transformation during continuous cooling are still lacking. Furthermore, no study has yet been reported on the mechanism underlying how magnetic fields and austenite grain sizes affect the martensitic transformation. In this study, SUS321 stainless steel is used to investigate the effect of grain size on the kinetics and mechanisms of the martensitic transformation during continuous cooling from 300 K to 4 K under various magnetic fields by using the physical property measurement system (PPMS). The results show that at a constant grain size, the M_s temperature and the final amount of martensite increase as a function of the magnetic field magnitude. Under the same magnetic field, a critical austenite grain size exists, which obviously accelerates the martensitic transformation during cooling. Detailed microstructural characterizations also show that the external magnetic field effectively promotes the formation of ε nucleation sites, which consequently enhances the nucleation rate of α′-martensite and its transformation during further cooling. These findings provide mechanistic insights into the previously found phenomenological results. Additionally, in-depth crystallographic analyses also demonstrate that although the magnetic field promotes ε nucleation, the variant selection during the γ→ε transformation is insensitive to the magnetic field magnitude, unlike the austenite grain size. Under the same magnetic field, the increase in the austenite grain size results in more ε variants during cooling. The collision of similar ε variants restricts the growth of martensite laths and retards the martensitic transformation in coarse-grained austenite. The variant selection of the final transformation ε→α′ is insensitive to the magnetic field magnitude and the austenite grain size.

Key words: magnetic field martensitic transformation cryogenic treatment austenitic stainless steel grain size

Received: 17 May 2021

ZTFLH:

TG111.5

Fund: National Natural Science Foundation of China(U1808208);National Natural Science Foundation of China(51961130389);National Natural Science Foundation of China(52011530032)

About author: XU Wei, professor, Tel: (024)83680246, E-mail: xuwei@ral.neu.edu.cn

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	Jiahua YUAN
	Qiuhong ZHANG
	Jinliang WANG
	Lingyu WANG
	Chenchong WANG
	Wei XU

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https://www.ams.org.cn/EN/10.11900/0412.1961.2021.00204 OR https://www.ams.org.cn/EN/Y2022/V58/I12/1570

Fig.1 OM images (a, c, e) and statistical results of average grain size (b, d, f) of the 50% cold-rolled sheet treated at different annealing temperatures for 30 min
(a, b) 1073 K (c, d) 1173 K (e, f) 1473 K

Fig.2 Variation curves of martensite content under 1 and 9 T magnetic fields of SUS321 stainless steel with different gain sizes during cooling
(a) 6.6 μm (b) 29.3 μm (c) 203 μm

Fig.3 EBSD phase maps of microstructure evolution of SUS321 stainless steel with different grain sizes during cooling under 1 T (a, c, e) and 9 T (b, d, f) magnetic fields
(a, b) 6.6 μm (c, d) 29.3 μm (e, f) 203 μm

Fig.4 Inverse pole figure (IPF) of ε-martensite in the 29.3 μm austenite grain

Fig.5 Contrast maps by electron channeling contrast imaging (ECCI) of microstructure evolution of SUS321 stainless steel with different grain sizes during cooling under 1 T (a, c, e) and 9 T (b, d, f) magnetic fields (Numbers 1-4 represent ε-martensite variants)
(a, b) 6.6 μm (c, d) 29.3 μm (e, f) 203 μm

Fig.6 IPFs and pole figures (insets) of α′-martensite of SUS321 stainless steel with different grain sizes under 1 T (a, c, e) and 9 T (b, d, f) magnetic fields (Numbers 1-6 represent the α′-martensite variants)
(a, b) 6.6 μm (c, d) 29.3 μm (e, f) 203 μm

Fig.7 Phase maps and the crystallographic information of grain boundary by EBSD for 29.3 μm samples under 1 T (a) and 9 T (b) magnetic fields (White, cyan, and black colors represent austenite, ε-martensite, and α'-martensite, respectively)

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