The effect of high temperature annealing in different atmospheres on microstructure of ODS materials

Vit Jan, Jan Čupera

Abstract


Mechanically alloyed oxide dispersion strengthened materials MA 6000 and MA 956 have been annealed at 1100ºC for 24 and 240 hours in air, vacuum of 10 -3 Pa and hydrogen atmosphere.. Mass changes due to oxidation and evaporation were measured. Fracture surfaces, microstructure of the materials and changes in chemical composition were examined along with surface layers  evolution and pores formation.

 On fracture surfaces and polished sections, formation of voids and altered microstructure sub-surface zones in both materials has been studied. Different mechanisms causing void formation are discussed and proposed in discussion. Also the mechanisms and reaction sequences of surface oxidation reactions are examined.


Keywords


ODS alloys, Oxidation, Vacuum, Hydrogen, Surface reactions

Full Text:

PDF

References


Pint, B.A.: High Temperature Corrosion of Alumina-forming Iron, Nickel and Cobalt-base Alloys. In Shreir's Corrosion, 606-645. Oxford: Elsevier 2010.

Goebel, J. A. et al: “Mechanisms for the hot corrosion of nickel-base alloys,” Metallurgical Transactions, vol. 4, no. 1, pp. 261-278, 1973. https://link.springer.com/article/10.1007%2FBF02649626?LI=true

Türker, M.:.: “Formation of porosity in ferritic ODS alloys on high temperature exposure,” Journal of Materials Science 40, no. 5 (March 1, 2005): 1201-1208. https://link.springer.com/article/10.1007%2Fs10853-005-6938-9?LI=true

Türker, M.: The long-term oxidation behaviour of ferritic ODS alloys at 1100-1200°C in air and nitrogen-2% oxygen. Corrosion Science 41, no. 10 (October 15): pp1921-1935. https://doi.org/10.1016/S0010-938X(99)00028-1

García-Alonso M. C. et al.: “Oxidation Behaviour of Fine-Grain MA 956 Superalloy,” Oxidation of Metals 53, no. 1 (February 1, 2000): 77-98. https://link.springer.com/article/10.1023%2FA%3A1004582713929?LI=true

Gao, Z.Y. et al: Mechanism of void formation in grain interior of ODS alloys , Journal of Alloys and Compounds 419 (2006) 126–132 https://doi.org/10.1016/j.jallcom.2005.10.010

Schneibel J.H.. et al: Development of porosity in an oxide dispersion-strengthened ferritic alloy containing nanoscale oxide particles, Scripta Materialia 57 (2007) 1040–1043 https://doi.org/10.1016/j.scriptamat.2007.07.029

Chen Y.L., et al: Origin of Porosity in Oxide-Dispersion-Strengthened Alloys Produced by Mechanical Alloying, Metallurgical and materials transactions A vol 33A, 2002 p.2713 https://link.springer.com/article/10.1007%2Fs11661-002-0393-x?LI=true

Chen Y.L., Jones A.R. : Reduction of Porosity in Oxide Dispersion–Strengthened Alloys Produced by Powder Metallurgy, Metallurgical and materials transactions A vol 32A, 2001 p.2077 https://link.springer.com/article/10.1007/s11661-001-0019-8

Lengauer, W., Ettmayer, P., et al. : Pore formation in P/M ferritic ODS superalloys during high-temperature heat treatment I. Considerations and experimental starting points, Powder Metallurgy International Volume 22, Issue 2, April 1990, Pages 19-22

Sporer, D., Lengauer, W.: Pore formation in P/M ferritic ODS superalloys during high-temperature heat treatment II. Thermodynamic considerations and conclusions, Powder Metallurgy International Volume 23, Issue 3, June 1991, Pages 162-165 https://www.researchgate.net/profile/Walter_Lengauer/publication/279589350_Pore_formation_in_PM_ferritic_ODS_superalloys_during_high-temperature_heat_treatment_II_Thermodynamic_considerations_and_conclusions/links/56fe6fb208ae650a64f71cb4.pdf

Salomon, R. J.: Incoloy alloy MA956. Strain rate and temperature effects on the microstructure and ductility., Journal de phisique, Vol 3, 1993, pp. 697-702 https://doi.org/10.1051/jp4:19937109

Miller, M.K. et.al: Stability of ferritic MA/ODS alloys at high temperatures ,

Intermetallics 13 (2005) 387–392 DOI: 10.1017/S1431927604881169

Gonzales-Carrasco, J.L. et al: Void Formation during Oxidation of the ODS Alloy MA6000, Metallurgical and Materials Trans. A, vol 26A, april 1995, pp 915-924 https://link.springer.com/article/10.1007/BF02649088

Schneibel J.H. et al.: Development of porosity in an oxide dispersion-strengthened ferritic alloy containing nanoscale oxide particles, Scripta Materialia 57 (2007) 1040–1043 https://doi.org/10.1016/j.scriptamat.2007.07.029

Pint B.A. : Oxidation Behaviour of ODS Fe–Cr Alloys, Oxidation of Metals, Vol. 63, Nos. 3/4, April 2005

Corrosion, Volume 1 Metal/Environment Reactions Edited by L. L. Shreir, A. Jarman, G. T. Burstein, Butterworth-Heinemann, 2000, ISBN O 7506 1077 8

Handbook of Corrosion Engineering Pierre R. Roberge, McGraw-Hill, 1999, ISBN 0-07-076516-2

Kim I. H. S. I. Kwun: Oxide Growth Mechanism and Oxidation Resistance in Mechanically Alloyed Ni-20Cr-20Fe-5Nb-1Y2O3 Alloy, Materials Science Forum Vols. 475-479 (2005) pp 4231-4234, DOI: 10.4028/www.scientific.net/MSF.475-479.4231

Bennett, M.J.: Recent Studies and Current Problems Concerning the High Temperature Oxidation Behaviour of Alumina Forming Iron Based Alloys, Solid State Phenomena Vol. 41 (1995) pp 235-252

Czyrska-Filemonowicz et al: Mechanically alloyed, ferritic oxide dispersion strengthened alloys: structure and properties, J. of Materials Processing, Technology 64 (1997) 53-64 https://doi.org/10.1016/S0924-0136(96)02553-8

Miller M.K. et al : Stability of ferritic MA/ODS alloys at high temperatures, Intermetallics 13 (2005) 387–392 https://doi.org/10.1016/j.intermet.2004.07.036

Messaoudi K, et al: Diffusion and growth mechanism of Al2O3 scales on ferritic Fe-Cr-Al alloys , Materials Science and Engineering A247 (1998) 248–262 https://doi.org/10.1016/S0921-5093(97)00711-9

Weinbruch S. et al.: On the Mechanism of High-Temperature Oxidationof ODS Superalloys: Significance of YttriumDepletion Within the Oxide Scales, Oxidation of Metals, Vol. 51, Nos. 1/2, 1999 https://doi.org/10.1023/A:1018806319821


Refbacks

  • There are currently no refbacks.




Copyright (c) 2018 Vit JAN

License URL: http://creativecommons.org/licenses/by-nc-nd/3.0/

................................

Articles published in the journal of Materials Engineering / Materialove inzinierstvo are indexed in Directory of Open Access Journals, Index Copernicus International, Google Scholar, Open J-GateBielefeld Academic Search Engine, Academic journal database, The Open Access Digital Library, ABC Chemistry - free chemical information, New jour, Academic Keys, Ulrich's Serials Solutions (a Proquest Business), EBSCO Academic Search, SHERPA/RoMEOGenamics JournalSeek, New York University Libraries, TrueserialsProQuest Database: ProQuest Engineering Journals, Cornell University Library,Scientific indexing services. You can find us on Facebook, Google Groups and Linked IN.