Thermal degradation of alloy CCA617 in pure steam at 750 and 850°C

Abstract

Oxidation and oxidation-induced microstructure evolution of CCA617 alloy was studied in pure steam at 750 and 850°C. Results showed that the alloy was oxidised approximately following a parabolic law. Temperature increase greatly promoted the external and internal oxidation. A single (Cr, Mn)₂O₃ layer with distribution of minor TiO₂ and MnCr₂O₄ formed at 750°C whereas a duplex oxide scale formed at 850°C consisting of a thin MnTiO₃ outer layer and a thicker (Cr, Mn)₂O₃ inner layer. TiO₂ and Al₂O₃ were formed internally especially along grain boundaries. Intragranular Mo-rich M₂₃C₆ type carbides were also observed. The carbides dissolved into the matrix as oxidation progressed. Based on detailed compositional and microstructural characterisation of the oxidised alloy, the mechanisms of external and internal oxidation as well as dissolution of the intragranular carbides are presented.

Keywords

Nickel-based superalloy Steam oxidation Microstructure Degradation XRD SEM TEM

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References

Viswanathan

Henry

Tanzosh

Stanko

Shingledecker

Vitalis

and Purgert

: ‘US program on materials technology for ultra-supercritical coal power plants’, J. Mater. Eng. Perform. 2005 14 (3), 281–292. doi: 10.1361/10599490524039

Gibbons

T. B.

: ‘Recent advances in steels for coal fired power plant: a review’, Trans. Indian Inst. Met. 2013 66 (5-6), 631–640. doi: 10.1007/s12666-013-0301-7

Terry

C. T.

and Weiju

: ‘ Procurement and initial characterization of alloy 230 and CMS alloy 617 ’, Report INL/EXT-06-11290, Idaho National Laboratory (INL)

Idaho, USA

2006. doi: 10.2172/911713

Viswanathan

Sarver

and Tanzosh

: ‘Boiler materials for ultra-supercritical coal power plants – steamside oxidation’, J. Mater. Eng. Perform. 2006 15 (3), 255–274. doi: 10.1361/105994906X108756

T. S.

Kim

S. H.

Kim

D. G.

Park

J. Y.

and Kim

Y. D.

: ‘Thermal degradation behavior of inconel 617 alloy’, Met. Mater. Int. 2008 14 (6), 739–743. doi: 10.3365/met.mat.2008.12.739

Kim

Jang

and Ryu

W. S.

: ‘Oxidation characteristics and oxide layer evolution of alloy 617 and Haynes 230 at 900°C and 1100°C’, Oxid. Met. 2009 71 (5-6), 271–293. doi: 10.1007/s11085-009-9142-5

Duval

Miserque

Tabarant

Nogier

J. P.

and Gédéon

: ‘Influence of the oxygen partial pressure on the oxidation of Inconel 617 alloy at high temperature’, Oxid. Met. 2010 74 (5-6), 215–238. doi: 10.1007/s11085-010-9207-5

Kim

Sah

Kim

Ryu

W. S.

and Jang

: ‘High temperature oxidation behavior of alloy 617 and Haynes 230 in impurity-controlled helium environments’, Oxid. Met. 2011 75 (1-2), 103–119. doi: 10.1007/s11085-010-9223-5

Kooa

Kimb

Yooc

Y. S.

and Janga

: ‘Oxidation behaviors of Ni-based superalloys for nuclear hydrogen production in steam with and without hydrogen environments’, Trans. Korean Nucl. Soc. 2011 283–284.

10.

Tung

H. M.

and Stubbins

J. F.

: ‘Incipient oxidation kinetics of alloy 617 and residual stress of the oxide scale formed in air at temperatures between 850 and 1000° C’, J. Nucl. Mater. 2012 424 (1), 23–28. doi: 10.1016/j.jnucmat.2012.01.015

11.

Yang

J. T.

Zhao

X. B.

Yuan

Yan

J. B.

Yin

H. F.

and Dang

Y. Y.

: ‘Study on the oxidation behaviour of HR3C in air and pure steam at 750°C’, J. Chinese Soc. Power Eng. (China) 2015 35 (10), 859–864.

12.

Hänsel

Quadakkers

and Young

: ‘Role of water vapor in chromia-scale growth at low oxygen partial pressure’, Oxid. Met. 2003 59 (3-4), 285–301. doi: 10.1023/A:1023040010859

13.

Pujilaksono

Jonsson

Halvarsson

Panas

Svensson

J. E.

and Johansson

L. G.

: ‘Paralinear oxidation of chromium in O₂ + H₂O environment at 600-700°C’, Oxid. Met. 2008 70 (3-4), 163–188. doi: 10.1007/s11085-008-9114-1

14.

Zheng

Peng

and Wang

: ‘Comparison of the dry and wet oxidation at 900°C of η-Fe₂Al₅ and δ-Ni₂Al₃ coatings’, Corros. Sci. 2011 53 (2), 597–603. doi: 10.1016/j.corsci.2010.10.003

15.

Tallman

R. L.

and Gulbransen

E. A.

: ‘Dislocation and grain boundary diffusion in the growth of α-Fe₂O₃ whiskers and twinned platelets peculiar to gaseous oxidation’, Nature 1968 218 1046–1047. doi: 10.1038/2181046a0

16.

Voss

D. A.

Butler

E. P.

and Mitchell

T. E.

: ‘The growth of hematite blades during the high temperature oxidation of iron’, Metall. Mater. Trans. A 1982 13 (5), 929–935. doi: 10.1007/BF02642408

17.

Bertrand

Desgranges

Poquillon

Lafont

M. C.

and Monceau

: ‘Iron oxidation at low temperature (260-500°C) in air and the effect of water vapor’, Oxid. Met. 2010 73 (1-2), 139–162. doi: 10.1007/s11085-009-9171-0

18.

Raynaud

G. M.

and Rapp

R. A.

: ‘In situ observation of whiskers, pyramids and pits during the high-temperature oxidation of metals’, Oxid. Met. 1984 21 (1), 89–102. doi: 10.1007/BF00659470

19.

Kofstad

P. K.

: ‘ Nonstoichiometry, diffusion, and electrical conductivity in binary metal oxides ’; 1972

New York

Wiley-Interscience.

20.

Bursill

L. A.

and Jun

S. G.

: ‘Temperature dependence of the solubility limit of chromia (Cr₂O₃) in titania (TiO₂)’, J. Solid State Chem. 1984 51 (3), 388–395. doi: 10.1016/0022-4596(84)90355-4

21.

Naoumidis

Schulze

H. A.

Jungen

and Lersch

: ‘Phase studies in the chromium–manganese–titanium oxide system at different oxygen partial pressures’, J. Eur. Ceram. Soc. 1991 7 (1), 55–63. doi: 10.1016/0955-2219(91)90054-4

22.

Pownceby

M. I.

Fisher-White

M. J.

and Swamy

: ‘Phase relations in the system Fe₂O₃–Cr₂O₃–TiO₂ between 1000 and 1300°C and the stability of (Cr,Fe)₂Ti _n− ₂O_2n−1 crystallographic shear structure compounds’, J. Solid State Chem. 2001 161 (1), 45–56. doi: 10.1006/jssc.2001.9265

23.

Young

D. J.

: ‘ High temperature oxidation and corrosion of metals ’; 2008

Amsterdam

Elsevier.

24.

Sohn

Y. H.

and Dayananda

M. A.

: ‘Diffusion studies in the β (B2), β′ (bcc), and γ (fcc) Fe–Ni–Al alloys at 1000°C’, Metall. Mater. Trans. A 2002 33 (11), 3375–3392. doi: 10.1007/s11661-002-0326-8

25.

Wagner

: ‘Reaktionstypen bei der oxydation von legierungen’, Zeitschrift für Elektrochemie, Berichte der Bunsengesellschaft für physikalische Chemie 1959 63 (7), 772–782.

26.

Böhm

and Kahlweit

: ‘Ueber die innere oxydation von metallegierungen’, Acta Mater. 1964 12 (5), 641–648. doi: 10.1016/0001-6160(64)90036-7

27.

Barin

: ‘ Thermochemical data of pure substances ’; 2003

Weinheim

VCH Verlagsgesellschaft mbH.

28.

Totemeier

T. C.

and Tian

: ‘Creep–fatigue–environment interactions in INCONEL 617’, Mater. Sci. Eng. A 2007 468 81–87. doi: 10.1016/j.msea.2006.10.170

29.

Floreen

Fuchs

G. E.

and Yang

W. J.

: ‘The metallurgy of alloy 625’, Superalloys 1994 718 (625), 13–37.

30.

Mankins

Hosier

and Bassford

: ‘Microstructure and phase stability of Inconel alloy 617’, Metall. Trans. 1974 5 (12), 2579–2590. doi: 10.1007/BF02643879

31.

Kimball

Lai

and Reynolds

: ‘Effects of thermal aging on the microstructure and mechanical properties of a commercial Ni–Cr–Co–Mo alloy (inconel 617)’, Metall. Mater. Trans. A 1976 7 (12), 1951–1952. doi: 10.1007/BF02659828

32.

Rahman

Priyadarshan

Raja

Nesbitt

and Misra

: ‘Investigation of the secondary phases of alloy 617 by scanning kelvin probe force microscope’, Mater. Lett. 2008 62 (15), 2263–2266. doi: 10.1016/j.matlet.2007.11.077

33.

Guo

Wang

B. H.

Hou

S. H.

Zhou

R. C.

and Bi

: ‘Aging precipitates of alloy 617 mod used for 700°C ultra supercritical unit’, Proceedings of the CSEE (China) 2014 34 (14), 2314–2318.

34.

Wang

X. M.

G. H. Q. Bi

and Xu

A. S.

: ‘Effect of silicon on grain boundary carbide precipitation and properties of a cobalt-free wrought nickel-based superalloy’, Superalloy 1980 63–72.

35.

Tan

Yang

Nanstad

and Busby

: ‘Effect of Thermal aging on coarsening kinetics of γ’ in alloy 617’, J. Phase Equilib. Diff. 2014 35 (5), 524–529. doi: 10.1007/s11669-014-0312-z

36.

Jang

Lee

and Kim

: ‘Oxidation behaviour of an alloy 617 in very high-temperature air and helium environments’, Int. J. Pres. Ves. Pip. 2008 85 (6), 368–377. doi: 10.1016/j.ijpvp.2007.11.010

37.

Akbari-Garakani

and Mehdizadeh

: ‘Effect of long-term service exposure on microstructure and mechanical properties of Alloy 617’, Mater. Des. 2011 32 (5), 2695–2700. doi: 10.1016/j.matdes.2011.01.017