1 National Center for Electron Microscopy in Beijing, Key Laboratory of Advanced Materials MOE, State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China 2 Central Iron and Steel Research Institute, Beijing 100081, China
In-situ microstructural evolutions of 5Mn steel at elevated temperature in a transmission electron microscope
1 National Center for Electron Microscopy in Beijing, Key Laboratory of Advanced Materials MOE, State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China 2 Central Iron and Steel Research Institute, Beijing 100081, China
ժҪ The microstructural evolutions of 5Mn steel during various heat treatments have been investigated by in-situ transmission electron microscopy (TEM). The specimen of 5Mn steel was prepared using focused ion beam (FIB) milling, which allowed the selection of specific morphology of interest prior to the in-situ observation. The complete austenization at 800��C was verified at the atomic scale by minimizing thermal expansion and sample drift in a heating holder based on micro-electro-mechanical-systems. During annealing at 650��C, the formation of reverted austenite was dynamically observed, while the morphologies of austenite laths of 5Mn steel after in-situ heating were quite similar to that after ex-situ intercritical annealing. During annealing at 500��C, the morphological evolution of cementite and associated Mn diffusion were investigated. It was demonstrated that a combination of FIB sampling and high temperature in-situ TEM enables us to probe the morphological evolution and elemental diffusion of specific areas of interest in steel at high spatial resolution.
Abstract��The microstructural evolutions of 5Mn steel during various heat treatments have been investigated by in-situ transmission electron microscopy (TEM). The specimen of 5Mn steel was prepared using focused ion beam (FIB) milling, which allowed the selection of specific morphology of interest prior to the in-situ observation. The complete austenization at 800��C was verified at the atomic scale by minimizing thermal expansion and sample drift in a heating holder based on micro-electro-mechanical-systems. During annealing at 650��C, the formation of reverted austenite was dynamically observed, while the morphologies of austenite laths of 5Mn steel after in-situ heating were quite similar to that after ex-situ intercritical annealing. During annealing at 500��C, the morphological evolution of cementite and associated Mn diffusion were investigated. It was demonstrated that a combination of FIB sampling and high temperature in-situ TEM enables us to probe the morphological evolution and elemental diffusion of specific areas of interest in steel at high spatial resolution.
Han-bo Jiang,Xi-nan Luo,Xiao-yan Zhong,*,Hui-hua Zhou,Cun-yu Wang,Jie Shi,Han Dong. In-situ microstructural evolutions of 5Mn steel at elevated temperature in a transmission electron microscope[J].Journal of Iron and Steel Research International, 2017, 24(11): 1109-1114.
Han-bo Jiang,Xi-nan Luo,Xiao-yan Zhong,*,Hui-hua Zhou,Cun-yu Wang,Jie Shi,Han Dong. In-situ microstructural evolutions of 5Mn steel at elevated temperature in a transmission electron microscope. , 2017, 24(11): 1109-1114.
W. Cao, C. Wang, J. Shi, M. Wang, W. Hui, H. Dong.Microstructure and mechanical properties of Fe�C0.2C�C5Mn steel processed by ART-annealing[J].Materials Science & Engineering A, 2011, 528(22):6661-6666
[2]
J. Shi, X. Sun, M. Wang, W. Hui, H. Dong, W. Cao.Enhanced work-hardening behavior and mechanical properties in ultrafine-grained steels with large-fractioned metastable austenite[J].Scripta Mater., 2010, 63(8):815-818
[3]
E. De Moor, D. K. Matlock, J. G. Speer, M. J. Merwin.Austenite stabilization through manganese enrichment[J].Scripta Mater., 2011, 64(2):185-188
[4]
S. Lee, S. J. Lee, B. C. De Cooman.Austenite stability of ultrafine-grained transformation-induced plasticity steel with Mn partitioning[J].Scripta Mater., 2011, 65(65):225-228
[5]
C. Wang, J. Shi, C. Y. Wang, W. J. Hui, M. Q. Wang, H. Dong, W. Q. Cao.Development of Ultrafine Lamellar Ferrite and Austenite Duplex Structure in 0.2C5Mn Steel during ART-annealing[J].ISIJ Int., 2011, 51(4):651-656
[6]
H. Luo, J. Shi, C. Wang, W. Cao, X. Sun, H. Dong.Experimental and numerical analysis on formation of stable austenite during the intercritical annealing of 5Mn steel[J].Acta Mater., 2011, 59(10):4002-4014
[7]
R. Wei, M. Enomoto, R. Hadian, H. Zurob, G. Purdy.Growth of austenite from as-quenched martensite during intercritical annealing in an Fe�C0.1C�C3Mn�C1.5Si alloy[J].Acta Mater., 2013, 51(4):697-707
[8]
X.N. Luo, X. Y. Zhong, H. W. Luo, H. H. Zhou, C. Y. Wang, J. Shi.Mn Diffusion at Early Stage of Intercritical Annealing of 5Mn Steel[J].J. Iron Steel Res. Int., 2015, 22(11):1015-1019
[9]
B. A. Lindsley, A. R. Marder.The morphology and coarsening kinetics of spheroidized FeC binary alloys[J].Acta Mater., 1998, 46(1):341-351
[10]
W. J. Nam, C. M. Bae.Scripta Mater.[J].Scripta Mater., 1999, 41(3):313-318
[11]
X. Q. Zhao, T. Pan, Q. F. Wang, H. Su, C. F. Yang, Q. X. Yang.Effect of Tempering Temperature on Microstructure and Mechanical Properties of Steel Containing Ni of 9%[J].J. Iron Steel Res. Int., 2011, 18(5):47-51
[12]
Y. Xia, X. N. Luo, X. Y. Zhong, H. H. Zhou, C. Y. Wang, J. Shi.In-situ TEM Observation of Cementite Coarsening Behavior of 5Mn Steel during Tempering[J].J. Iron Steel Res. Int., 2016, 23(5):442-446
[13]
J. Lin, X. N. Luo, X. Y. Zhong, H. H. Zhou, C. Y. Wang, J. Shi, H. Dong.Dislocation Pipe Diffusion of Mn during Annealing of 5Mn Steel[J].J. Iron Steel Res. Int., 2016, 23(12):1277-1280
[14]
H. P. Longworth, C. V. Thompson.Abnormal grain growth in aluminum alloy thin films[J].J. Appl. Phys., 1991, 69(7):3929-3940
[15]
P. Zheng, M. O. Ruault, M. F. Denanot, B. Descouts, P. Krauz.In situ thermal annealing of InP amorphous layer induced by Si implantation[J].J. Appl. Phys., 1991, 69(1):197-202
[16]
M. Legros, G. Dehm, R. M. Keller-Flaig, E. Arzt, K. J. Hemker, S. Suresh.Dynamic observation of Al thin films plastically strained in a TEM[J].Mater. Sci. Eng. A, 2001, 463(1):309-310
[17]
F. Radulescu, J. M. McCarthy, E. Stach.In situ annealing transmission electron microscopy study of Pd/Ge/Pd/GaAs interfacial reactions[J].Mater. Res. Soc. Symp. Proc., 2000, 589(1):179-184
[18]
M. A. Van Huis, N. P. Young, G. Pandraud, J. F. Creemer, D. Vanmaekelbergh, A. I. Kirkland, H. W. Zandbergen.Atomic imaging of phase transitions and morphology transformations in nanocrystals[J].Adv. Mater., 2009, 21(48):4992-4995
[19]
A. Figuerola, M. Van Huis, M. Zanella, A. Genovese, S. Marras, A. Falqui, H. W. Zandbergen, R. Cingolani, L. Manna.Epitaxial CdSe-Au nanocrystal heterostructures by thermal annealing[J].Nano Lett., 2010, 10(8):3028-3036
[20]
M. Duchamp, Q. Xu, R. E. Dunin-Borkowski.Convenient preparation of high-quality specimens for annealing experiments in the transmission electron microscope[J].Microsc. Microanal., 2014, 20(6):1-8
[21]
L. A. Giannuzzi, J. L. Drown, S. R. Brown, R. B. Irwin, F. A. Stevie.Focused ion beam milling and micromanipulation lif-tout for site specific cross-section TEM specimen preparation[J].Mater. Res. Soc. Symp. Proc., 1997, 480(1):19-27
[22]
Q. Jeangros, A. Faes, J. B. Wagner, T. W. Hansen, J. Van Herle, A. Hessler-Wyser, R. E. Dunin-Borkowski.In situ redox cycle of a nickel�CYSZ fuel cell anode in an environmental transmission electron microscope[J].Acta Mater., 2010, 58(14):4578-4589
[23]
H. Wang, S. G. Xiao, Q. Xu, T. Zhang, H. W. Zandbergen.Fast Preparation of Ultrathin FIB Lamellas for MEMs-Based In Situ TEM Experiments[J].Mater. Sci. Forum, 2016, 850(1):722-727