Compositional Variants of Cu-rich Precipitate in Thermally Aged Ferritic Steel
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Abstract
Atom probe tomography was utilized to investigate Cu precipitation in a high-strength low-alloy steel isothermally aged at 500 °C for 1, 4, 16, and 64 h after water-quenching from 900 °C. With prolonged aging time, the Cu-rich precipitates (CRPs) increased in size and decreased in number density, and gradually evolved from spheroidal to elliptical in morphology. The small CRPs were rich in a high amount of Fe and a certain amount of Ni and Mn at their early nucleation stage. The large CRPs with increased size due to extensive aging contained less Fe and more Cu at their later growth stage. Additionally, Ni and Mn were both readily to segregate at the CRP/matrix heterophase interfaces, and Mn was higher in content than Ni in the precipitate interior especially when the CRPs were large in size.
Keywords
High-strength low-alloy steel Thermal aging Cu-rich precipitate Atom probe tomographyNotes
Acknowledgements
One of the authors, Qingdong Liu, thanks to Mrs Qifeng Zeng at Shanghai Nuclear Engineering and Research & Design Institute, China, for her great support to this research.
References
- [1]E.J. Czyryca, R.E. Link, R.J. Wong, D.A. Aylor, T.W. Montemarano, J.P. Gudas, Nav. Eng. J. 102, 63 (1990)CrossRefGoogle Scholar
- [2]S. Thompson, G. Krauss, Metall. Mater. Trans. A 27, 1573 (1996)CrossRefGoogle Scholar
- [3]S. Vaynman, D. Isheim, R.P. Kolli, S.P. Bhat, D.N. Seidman, M.E. Fine, Metall. Mater. Trans. A 39, 363 (2008)CrossRefGoogle Scholar
- [4]R.D.K. Misra, Z. Jia, R. O′Malley, S.J. Jansto. Mater. Sci. Eng. A 528, 8772 (2011)CrossRefGoogle Scholar
- [5]Z. Zhang, C. Liu, Y. Wen, A. Hirata, S. Guo, G. Chen, M. Chen, B. Chin, Metall. Mater. Trans. A 43, 351 (2012)CrossRefGoogle Scholar
- [6]R.P. Kolli, D.N. Seidman, in Heat Treatment of Copper Precipitation-Strengthened Steels, ASM Handbook, Volume 4D, Heat Treating of Irons and Steels, ed by J. Dossett, G.E. Totten (ASM International, Materials Park 2014), pp. 188Google Scholar
- [7]G.E. Lucas, J. Nucl. Mater. 407, 59 (2010)CrossRefGoogle Scholar
- [8]Reports: Integrity of Reactor Pressure Vessels in Nuclear Power Plants: Assessment of Irradiation Embrittlement Effects in Reactor Pressure Vessel Steels, IAEA Nuclear Energy Series. No. NP-T-3.11. International Atomic Agency, Vienna, 2009Google Scholar
- [9]G.R. Odette, B.D. Wirth, D.J. Bacon, N.M. Ghoniem, MRS Bull. 26, 176 (2001)CrossRefGoogle Scholar
- [10]T. Takeuchi, A. Kuramoto, J. Kameda, T. Toyama, Y. Nagai, M. Hasegawa, T. Ohkubo, T. Yoshiie, Y. Nishiyama, K. Onizawa, J. Nucl. Mater. 402, 93 (2010)CrossRefGoogle Scholar
- [11]M.K. Miller, K.F. Russell, J. Nucl. Mater. 372, 145 (2007)CrossRefGoogle Scholar
- [12]G. Xu, L.L. Cai, L. Feng, B.X. Zhou, J.A. Wang, H.S. Zhang, Acta Metall. Sin. 48, 753 (2012). (in Chinese) CrossRefGoogle Scholar
- [13]Z. Lu, Acta Metall. Sin. 47, 777 (2011). (in Chinese) Google Scholar
- [14]D. Isheim, R.P. Kolli, M.E. Fine, D.N. Seidman, Scr. Mater. 55, 35 (2006)CrossRefGoogle Scholar
- [15]R.P. Kolli, D.N. Seidman, Microsc. Microanal. 13, 272 (2007)CrossRefGoogle Scholar
- [16]R.P. Kolli, Z. Mao, D.T. Keane, D.N. Seidman, Appl. Phys. Lett. 91, 241903 (2007)CrossRefGoogle Scholar
- [17]R.P. Kolli, D.N. Seidman, Acta Mater. 56, 2073 (2008)CrossRefGoogle Scholar
- [18]M.D. Mulholland, D.N. Seidman, Scr. Mater. 60, 992 (2009)CrossRefGoogle Scholar
- [19]M.D. Mulholland, D.N. Seidman, Acta Mater. 59, 1881 (2011)CrossRefGoogle Scholar
- [20]Z.W. Zhang, C.T. Liu, M.K. Miller, X. Wang, Y.R. Wen, T. Fujita, A. Hirata, M.W. Chen, G. Chen, B.A. Chin, Sci. Rep. 3, 1327 (2013)CrossRefGoogle Scholar
- [21]R.P. Kolli, D.N. Seidman, Microsc. Microanal. 20, 1727 (2014)CrossRefGoogle Scholar
- [22]M.K. Miller, Atom Probe Tomography: Analysis at the Atomic Level (Kluwer Academic/Plenum Publishers, New York, 2000), p. 26CrossRefGoogle Scholar
- [23]Q.D. Liu, J.F. Gu, W.Q. Liu. Metall. Mater. Trans. A 44, 4434 (2013)CrossRefGoogle Scholar
- [24]Q.D. Liu, S.J. Zhao, MRS Commun. 4, 127 (2012)CrossRefGoogle Scholar
- [25]B.L. Tiemens, A.K. Sachdev, R.K. Mishra, G.B. Olson, Metall. Mater. Trans. A 43, 3626 (2012)CrossRefGoogle Scholar
- [26]Q.D. Liu, W.Q. Liu, X.Y. Xiong, J. Mater. Res. 27, 1060 (2012)CrossRefGoogle Scholar
- [27]Q.D. Liu, S.J. Zhao, Metall. Mater. Trans. A 44, 163 (2013)CrossRefGoogle Scholar
- [28]R. Monzen, M. Iguchi, M.L. Jenkins, Philos. Mag. Lett. 80, 137 (2000)CrossRefGoogle Scholar
- [29]P.J. Othen, M.L. Jenkins, G.D.W. Smith, Philos. Mag. A 70, 1 (1994)CrossRefGoogle Scholar
- [30]R. Monzen, M.L. Jenkins, A.P. Sutton, Philos. Mag. 80, 711 (2000)CrossRefGoogle Scholar
- [31]G. Xu, D.F. Chu, L.L. Cai, B.X. Zhou, W. Wang, J.C. Peng, Acta Metall. Sin. 47, 905 (2011). (in Chinese) Google Scholar
- [32]R. Monzen, K. Takada, C. Watanabe, ISIJ Int. 44, 442 (2004)CrossRefGoogle Scholar