The Pathology of PM HIP Duplex Stainless Steels

The Pathology of PM HIP Duplex Stainless Steels

Tomas Berglund, Björn-Olof Bengtsson, Jan-Olof Nilsson

Abstract. Tests were conducted to simulate possible issues in manufacturing of Powder Metallurgical HIPed Duplex Stainless Steels. Root causes, and consequences are analyzed and discussed from a manufacturing, metallurgical and properties point of view. The results highlight the importance of material understanding and good process control when manufacturing these alloys. While some issues are unique to PM HIP material, many of them can also be found in conventional wrought materials e.g., sigma phase and nitride precipitation. In addition, the findings in this study puts into question limitations stated in some specifications for this process and alloys. The findings show the importance of staying within these limitations but also show that some aspects are not as critical. The majority of these specifications are based on forging specifications that might result in unnecessary limitations on the PM HIP process and materials. This while not necessarily ensuring material quality or possibly limiting material use.

Keywords
Powder Metallurgy, PM, Hot Isostatic Pressing, HIP, Duplex Stainless Steel, DSS, Super Duplex Stainless Steel, SDSS

Published online 12/8/2023, 6 pages
Copyright © 2023 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA

Citation: Tomas Berglund, Björn-Olof Bengtsson, Jan-Olof Nilsson, The Pathology of PM HIP Duplex Stainless Steels, Materials Research Proceedings, Vol. 38, pp 29-34, 2023

DOI: https://doi.org/10.21741/9781644902837-5

The article was published as article 5 of the book Hot Isostatic Pressing

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

References
[1] U. Kivisäkk, Influence of hydrogen on corrosion and stress induced cracking in stainless steels, Doctoral Thesis, The Royal Institute of Technology, Stockholm, Sweden, (2010).
[2] T. Berglund, M. Östlund and A. Scheerder, Improved Corrosion Properties With PM HIP For Duplex Safurex®UXM? Developed For Urea Manufacturing — Called: Safurex®UXM°, Proc. World PM 2016
[3] A. Cooper, Effect of Oxygen Content Upon the Microstructural and Mechanical Properties of Type 316L Austenitic Stainless Steel Manufactured by Hot Isostatic Pressing, Metall. Mater. Trans. A, Published online 22 June 2016. https://doi.org/10.1007/s11661-016-3612-6
[4] T. Berglund and M. Östlund, Impact Toughness for PM HIP 316L at Cryogenic Temperatures, Proc. ASME 2016 Pressure Vessels and Piping Conference, Paper No: PVP2016-64002. https://doi.org/10.1115/PVP2016-64002
[5] B-O Bengtsson, G. J. Del Corso and J. F. Scanlon, Impact Strength for PM HIP: Properties of PM HIP Stainless steels, Proc. Euro PM2012 conference, 2012, Basel, Switzerland
[6] J. O. Nilsson, Overview, Super Duplex Stainless Steels, Mat. Sci. Techn., 8 (1992) 686-700. https://doi.org/10.1179/mst.1992.8.8.685
[7] A. Wilson and J. O. Nilsson, Modelling CCT-diagrams of intermetallic phase precipitation in duplex stainless steels, Scand. J. Metall, 25 (1996) 178-185.
[8] J. O. Nilsson, P. Kangas, T. Karlsson and A. Wilson, Mechanical properties, microstructural stability, and kinetics of sigma phase formation in a super duplex stainless steel, Metall. Mater. Trans. A, 31A (2000) 35-45. https://doi.org/10.1007/s11661-000-0050-1
[9] J-O Nilsson and G. Chai, “Physical Metallurgy in duplex stainless steels”, Proc. Conference on Duplex stainless steels 2010, Beaune, France, EDP Science, (2010), 268–390.
[10] L. Karlsson, Overview, Duplex Stainless Steel 2000, Associazione Italiana di Metallurgia (2000), 693-702.
[11] N. Pettersson, R. F. A. Pettersson and S. Wessman, Precipitation of Chromium Nitrides in the Super Duplex Stainless Steel 2507, Metall. Mater. Trans. A, (2015), Published online 04 January 2015. https://doi.org/10.1007/s11661-014-2718-y
[12] B. Josefsson, J. O. Nilsson and A. Wilson, Phase transformations in duplex steels and the relation between continuous cooling and isothermal heat treatment, Proc. Conf. “Duplex Stainless Steels 91”, Beaune France, Les Edition de Physique, 1, 67 (1991)
[13] O. Smuk, Microstructure and properties of modern P/M super duplex stainless steels, Doctoral thesis, Royal institute of Technology, Stockholm, ISBN: 91-7283-761-6