Creep and creep rupture behaviour of 650 °C ferritic/martensitic super heat resistant steels
-
Christina Berger
,
Alfred Scholz
Abstract
The investigations of high-temperature creep properties of advanced ferritic/martensitic steels for 650 °C power plant components focus on the chemical composition as well as on the heat treatment conditions. First experiments on various modifications of the 9% Cr model piping steel P92 demonstrate a negative influence of 12% Cr, 5% Co and low tempering conditions on the creep rupture strength up to 104 h operating time. Low tempering conditions promote the precipitation of the modified Z-phase Cr(V, Nb) N during creep. This phase was recently identified as a major cause for premature breakdown in creep strength of some 9 – 12% Cr martensitic steels. The aim “650 °C/100 MPa/ 100 000 h” in creep life was not achieved in this investigation so far. The effect of boron on the improvement of creep behaviour depends on the interaction of chemical composition and heat treatment. Further activities focus on the stabilization of M23C6, a fine distribution of VN and measures for avoidance of Z-phase.
-
The financial support by the Deutsche Forschungsgemeinschaft is gratefully acknowledged. Further companies in the working group are kindly acknowledged for providing test material.
References
[1] T. Fujita: Trans. JIM 9 (1968) 167.10.2320/matertrans1960.9.143Search in Google Scholar
[2] T. Fujita: International Workshop on Development of Advanced Heat Resistant Steels, 8th November 1999, Yokohama, Japan (1999).Search in Google Scholar
[3] F. Abe, T. Horiuchi, M. Taneike, in: A. Strang, R.D. Conroy, W.M. Banks (Eds.), Parsons 2003, Engineering Issues in Turbine Machinery, Power Plant and Renewables, Proc. of the Sixth Intern. Charles Parsons Turbine Conf. 16–18 September 2003, Trinity College Dublin, Ireland (2003) 379.Search in Google Scholar
[4] F. Abe: 4th EPRI Conference on Advances in Materials Technogy for Fossil Power Plants, 25–28 October 2004, Hilton Oceanfront Resort, Hilton Head Island, SC, USA (2004) 273.Search in Google Scholar
[5] J. Hald, S. Straub, in: J. Lecomte-Beckers, F. Schubert, P.J. Ennis (Eds.), Materials for Advanced Power Engineering 1998, Proc. of the 6th Liege Conf. (1998) 155.Search in Google Scholar
[6] M. Hättestrand, H.-O. Andren: Mater. Sci. and Eng. A 270 (1999) 33.10.1016/S0921-5093(99)00232-4Search in Google Scholar
[7] P. Hofer, M.K. Miller, S.S. Babu, S.A. David, C. Cerjak: Metall. and Mater. Transaction A 31 (2000).10.1007/s11661-000-0039-9Search in Google Scholar
[8] R. Agamennone, C. Berger, W. Blum, J. Ehlers, P.J. Ennis, J. Granacher, G. Inden, V. Knezevic, J.W. Quadakkers, G. Sauthoff, A. Scholz, L. Singheiser, J. Vilk, Y. Wang, in: J. Lecomte-Beckers, M. Carton, F. Schubert (Eds.), Materials for Advanced Power Engineering 2002, Proc. of the 7th Liege Conf. (2002) 1279.Search in Google Scholar
[9] R. Agamennone, W. Blum: Mater. Sci. and Eng. A (2004) to be published.Search in Google Scholar
[10] L. Korcakova: Ph.D. Dissertation, TU Denmark, Lyngby, Denmark, August (2002)Search in Google Scholar
[11] K. Maile, G. Zies: Final COST 522 Report, MPA Stuttgart, 2003.Search in Google Scholar
[12] A. Strang, V. Vodarek, in: A. Strang, W.M. Banks, R.D. Conroy (Eds.), Parsons 2000 Advanced Materials for 21st Century Turbines an Power Plants, The University Press, Cambridge (2000) 572.Search in Google Scholar
[13] K. Kimura, K. Suzuki, Y. Toda, H. Kushima, F. Abe, in: J. Lecomte-Beckers, M. Carton, F. Schubert (Eds.), Materials for Advanced Power Engineering 2002, Proc. of the 7th Liege Conf. (2002) 1171.Search in Google Scholar
[14] H. Danielson, J. Hald: Z-phase in 9–12% Cr Steels, Report, Technical University of Denmark (2004).Search in Google Scholar
© 2005 Carl Hanser Verlag, München
Articles in the same Issue
- Frontmatter
- Editorial
- Editorial
- Articles Basic
- Identifying creep mechanisms in plastic flow
- A unified microstructural metal plasticity model applied in testing, processing, and forming of aluminium alloys
- Implications of non-negligible microstructural variations during steady-state deformation
- Tertiary creep of metals and alloys
- Interactions between particles and low-angle dislocation boundaries during high-temperature deformation
- Strain-rate sensitivity of ultrafine-grained materials
- Transient plastic flow at nominally fixed structure due to load redistribution
- Vacancy concentrations determined from the diffuse background scattering of X-rays in plastically deformed copper
- Effect of heating rate in α + γ dual-phase field on lamellar microstructure and creep resistance of a TiAl alloy
- About stress reduction experiments during constant strain-rate deformation tests
- Finite-element modelling of anisotropic single-crystal superalloy creep deformation based on dislocation densities of individual slip systems
- Variational approach to subgrain formation
- Articles Applied
- Pseudoelastic cycling of ultra-fine-grained NiTi shape-memory wires
- Creep properties at 125 °C of an AM50 Mg alloy modified by Si additions
- Dependence of mechanical strength on grain structure in the γ′ and oxide dispersions-trengthened nickelbase superalloy PM 3030
- On the improvement of the ductility of molybdenum by spinel (MgAl2O4) particles
- Hot workability and extrusion modelling of magnesium alloys
- Characterization of hot-deformation behaviour of Zircaloy-2: a comparison between kinetic analysis and processing maps
- Requirements for microstructural investigations of steels used in modern power plants
- Influence of Lüders band formation on the cyclic creep behaviour of a low-carbon steel for piping applications
- Creep and creep rupture behaviour of 650 °C ferritic/martensitic super heat resistant steels
- Toughening mechanisms of a Ti-based nanostructured composite containing ductile dendrites
- Notifications/Mitteilungen
- Personal/Personelles
- News/Aktuelles
- Conferences/Konferenzen
Articles in the same Issue
- Frontmatter
- Editorial
- Editorial
- Articles Basic
- Identifying creep mechanisms in plastic flow
- A unified microstructural metal plasticity model applied in testing, processing, and forming of aluminium alloys
- Implications of non-negligible microstructural variations during steady-state deformation
- Tertiary creep of metals and alloys
- Interactions between particles and low-angle dislocation boundaries during high-temperature deformation
- Strain-rate sensitivity of ultrafine-grained materials
- Transient plastic flow at nominally fixed structure due to load redistribution
- Vacancy concentrations determined from the diffuse background scattering of X-rays in plastically deformed copper
- Effect of heating rate in α + γ dual-phase field on lamellar microstructure and creep resistance of a TiAl alloy
- About stress reduction experiments during constant strain-rate deformation tests
- Finite-element modelling of anisotropic single-crystal superalloy creep deformation based on dislocation densities of individual slip systems
- Variational approach to subgrain formation
- Articles Applied
- Pseudoelastic cycling of ultra-fine-grained NiTi shape-memory wires
- Creep properties at 125 °C of an AM50 Mg alloy modified by Si additions
- Dependence of mechanical strength on grain structure in the γ′ and oxide dispersions-trengthened nickelbase superalloy PM 3030
- On the improvement of the ductility of molybdenum by spinel (MgAl2O4) particles
- Hot workability and extrusion modelling of magnesium alloys
- Characterization of hot-deformation behaviour of Zircaloy-2: a comparison between kinetic analysis and processing maps
- Requirements for microstructural investigations of steels used in modern power plants
- Influence of Lüders band formation on the cyclic creep behaviour of a low-carbon steel for piping applications
- Creep and creep rupture behaviour of 650 °C ferritic/martensitic super heat resistant steels
- Toughening mechanisms of a Ti-based nanostructured composite containing ductile dendrites
- Notifications/Mitteilungen
- Personal/Personelles
- News/Aktuelles
- Conferences/Konferenzen
