Abstract
This research assesses the thermal stability of lean grades of duplex stainless steel relative to standard grade alloys. Both hot rolled plate and gas-tungsten-arc weld deposits of selected alloys were isothermally aged in the temperature regime of α-α’ phase separation (T = 800°F / 427°C) for times up to 1,000 hours. The degree of embrittlement was assessed via changes in hardness and Charpy impact energy. Additionally, the materials were characterized by light optical microscopy, electron microprobe analysis (EMPA), analytical electron microscopy (AEM), and x-ray diffraction (XRD) to better understand the factors that affect embrittlement. Impact testing shows that at equivalent thermal exposure, small changes in alloy composition have a significant effect on the degree of embrittlement. Microscopy reveals that spinodal decomposition of the ferrite occurs in all the alloys tested at 800°F (427°C). Additionally, transmission electron microscopy shows complex intermetallic formation, likely G phase, in the standard grade weld metal. Relative to their standard grade counterparts, both the lean grade plate and the lean grade weld deposit display ~10X slower embrittlement kinetics for the conditions studied. Despite the relatively complex metallurgy of these alloys, this research indicates that lean grade duplex stainless steels could have broad applicability to lower temperature components in nuclear power systems.
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References
Guttmann, M. Intermediate Temperature Aging of Duplex Stainless Steels. A Review. in Duplex Stainless Steels ’91. 1991. Bourgogne, France.
Danoix, F. and P. Auger, Atom Probe Studies of the Fe-Cr System and Stainless Steels Aged at Intermediate Temperatures: A Review. Materials Characterization, 2000. 44: p. 177–201.
Charles, J., Duplex Stainless Steels — a Review after DSS ’07 held in Grado. Steel Research Int., 2008. 79(6).
Tucker, J.D., G.A. Young, and D.R. Eno. Thermal Embrittlement of a Lean Grade of Duplex Stainless Steel: Alloy 2003. in PTM 2010. 2010. Avignon, France.
Hixon, J.R., J.H. Kim, and R.G. Ballinger. Effect of Thermal Aging on SCC and Mechanical Properties of Stainless Steel Weld Metals. in 13th International Conference on Environmental Degradation of Materials in Nuclear Power Systems. 2007. Whistler, B.C., Canada: TMS / ANS / NACE.
Chung, H.M. and O.K. Chopra. Kinetics and Mechanism of Thermal Aging Embrittlement of Duplex Stainless Steels. in Proceedings of the Third International Symposium on Environmental Degradation of Materials in Nuclear Power Systems -Water Reactors. 1987. Traverse City, MI: TMS.
Pareige, C., et al. Atomic Scale Study of Phase Transformation in Long Term Thermally Aged Duplex Stainless Steels: Relation Between Microstructure and Properties. in Fontevraud 7. 2010.
Porter, D.A. and K.E. Easterling, Phase Transformations in Metals and Alloys. 2nd ed. 1992, London, UK: Chapman & Hall.
Solomon, H.D. and T.M. Devine Jr.. Duplex Stainless Steels — A Tale of Two Phases. in Duplex Stainless Steels, R.A.. Lula, Ed. 1983: ASM.
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© 2011 TMS (The Minerals, Metals & Materials Society)
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Young, G.A., Tucker, J.D., Lewis, N., Plesko, E., Sander, P. (2011). Assessment of Lean Grade Duplex Stainless Steels for Nuclear Power Applications. In: Busby, J.T., Ilevbare, G., Andresen, P.L. (eds) Proceedings of the 15th International Conference on Environmental Degradation of Materials in Nuclear Power Systems — Water Reactors. Springer, Cham. https://doi.org/10.1007/978-3-319-48760-1_143
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DOI: https://doi.org/10.1007/978-3-319-48760-1_143
Publisher Name: Springer, Cham
Online ISBN: 978-3-319-48760-1
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