Hostname: page-component-6b989bf9dc-vmcqm Total loading time: 0 Render date: 2024-04-14T05:05:00.289Z Has data issue: false hasContentIssue false

Scale-Bridging Analysis on Deformation Behavior of High-Nitrogen Austenitic Steels

Published online by Cambridge University Press:  06 August 2013

Tae-Ho Lee*
Affiliation:
Ferrous Alloy Department, Advanced Metallic Materials Division, Korea Institute of Materials Science, 797 Changwondaero, Changwon 642-831, SouthKorea
Heon-Young Ha
Affiliation:
Ferrous Alloy Department, Advanced Metallic Materials Division, Korea Institute of Materials Science, 797 Changwondaero, Changwon 642-831, SouthKorea
Byoungchul Hwang
Affiliation:
Department of Materials Science & Engineering, Seoul National University of Science and Technology, 232 Gongneung, Nowon, Seoul 139-743, SouthKorea
Sung-Joon Kim
Affiliation:
Graduate Institute of Ferrous Technology, Pohang University of Science & Technology, San 31 Hyoja, Nam, Pohang 790-784, SouthKorea
Eunjoo Shin
Affiliation:
Neutron Physics Department, Korea Atomic Energy Research Institute, P.O.B. 105, Yuseong, Daejeon 305-600, SouthKorea
Jong Wook Lee
Affiliation:
Doosan Heavy Industries & Construction, Changwon 642-792, SouthKorea
*
*Corresponding author. E-mail: lth@kims.re.kr
Get access

Abstract

Scale-bridging analysis on deformation behavior of high-nitrogen austenitic Fe–18Cr–10Mn–(0.39 and 0.69)N steels was performed by neutron diffraction, electron backscattered diffraction (EBSD), and transmission electron microscopy (TEM). Two important modes of deformation were identified depending on the nitrogen content: deformation twinning in the 0.69 N alloy and strain-induced martensitic transformation in the 0.39 N alloy. The phase fraction and deformation faulting probabilities were evaluated based on analyses of peak shift and asymmetry of neutron diffraction profiles. Semi in situ EBSD measurement was performed to investigate the orientation dependence of deformation microstructure and it showed that the variants of ε martensite as well as twin showed strong orientation dependence with respect to tensile axis. TEM observation showed that deformation twin with a {111}⟨112⟩ crystallographic component was predominant in the 0.69 N alloy whereas two types of strain-induced martensites (ε and α′ martensites) were observed in the 0.39 N alloy. It can be concluded that scale-bridging analysis using neutron diffraction, EBSD, and TEM can yield a comprehensive understanding of the deformation mechanism of nitrogen-alloyed austenitic steels.

Type
Research Article
Copyright
Copyright © Microscopy Society of America 2013 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Fujita, H. & Mori, T. (1972). Stacking faults and f.c.c. (γ) → h.c.p. (ε) transformation in 18/8-type stainless steel. Acta Metall 20, 759767.10.1016/0001-6160(72)90104-6Google Scholar
Idrissi, H., Renard, K., Ryelandt, L., Schryvers, D. & Jacques, P.J. (2007). On the mechanism of twin formation in Fe-Mn-C TWIP steels. Acta Mater 58, 24642476.Google Scholar
Lee, T.-H., Kim, S.-J., Shin, E. & Takaki, S. (2006). On the crystal structure of Cr2N precipitates in high-nitrogen austenitic stainless steel (III) neutron diffraction study on the ordered Cr2N superstructure. Acta Cryst 62, 979986.10.1107/S0108768106034173Google Scholar
Lee, T.-H., Oh, C.-S. & Kim, S.-J. (2008). Effects of nitrogen on deformation-induced martensitic transformation in metastable austenitic Fe-18Cr-10Mn-N steels. Scripta Mater 58, 110113.10.1016/j.scriptamat.2007.09.029Google Scholar
Lee, T.-H., Oh, C.-S., Kim, S.-J. & Takaki, S. (2007). Deformation twinning in high nitrogen austenitic stainless steel. Acta Mater 55, 36493662.Google Scholar
Nishiyama, Z. (1971). Martensitic Transformation. New York: Academic Press Inc.Google Scholar
Remy, L. & Pineau, A. (1977). Twinning and strain-induced f.c.c. → h.c.p. transformations in the Fe–Mn–Cr–C system. Mater Sci Eng 28, 99107.10.1016/0025-5416(77)90093-3Google Scholar
Rodriguez-Carvajal, J. (1998). FullProf, Version 3.5d. Saclay, France: Laboratoire Leon Brillouin.Google Scholar
Thompson, P., Cox, D.E. & Hastings, J.B. (1987). Rietveld refinement of Debye-Scherrer synchrotron X-ray data from Al2O3. J Appl Cryst 20, 7983.Google Scholar
Venables, J.A. (1962). The martensite transformation in stainless steels. Phil Mag 7, 3544.Google Scholar
Wagner, C.N.J. (1966). Analysis of the broadening and change in position of peaks in an X-ray powder pattern. In Local Atomic Arrangement Studied by X-Ray Diffraction, Cohen, J.B. & Hilliard, J.E. (Eds.). pp. 219269. New York: Gordon and Breach.Google Scholar