Microstructure evolution at high temperature of chromium-rich iron-based alloys containing hafnium carbides
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Elodie Conrath
Abstract
The high temperature behavior of three iron-based alloys rich in chromium and containing HfC carbides was studied in comparison with two ternary Fe – Cr – C alloys. All these alloys, contain 25 wt.% Cr, 0.25 or 0.50 wt.% C, and additionally 3.7 to 5.6 wt.% Hf for three of them. All alloys were produced in a foundry. They were exposed to air at 1 200 °C for 46 h. Their microstructures in the as-cast state and after exposure to high temperature were characterized using X-ray diffraction, electron microscopy and image analysis. The alloys were also subjected to indentation tests in their as-cast states and in their aged states. The obtained microstructures are composed of a dendritic bcc iron-based matrix and of HfC carbides. These carbides are of two types: script-like eutectic carbides mixed with matrix, and compact pre-eutectic carbides. Some chromium carbides were additionally obtained in two of the three Hf-containing alloys. These microstructures have roughly evolved during the high temperature exposure: variations of the surface fraction of the chromium carbides and increase in the HfC surface fractions. Consequently, the hardness was more (ternary alloys) or less (Hf-containing alloys) decreased. The morphologies of the carbides evolved: coalescence of the chromium carbides, coalescence and fragmentation of the HfC carbides. The behavior of these alloys in oxidation at high temperature is perfectible. It is to be improved to allow the use of such alloys at high temperature.
References
[1] E.F.Bradley: Superalloys: A Technical Guide, ASM International, Metals Park (1988).Search in Google Scholar
[2] D.Young: High Temperature Oxidation Oxidation and Corrosion of Metals, Elsevier Corrosion Series, Amsterdam (2008).Search in Google Scholar
[3] P.Kofstad: High Temperature Corrosion, Elsevier Applied Science, London (1988).Search in Google Scholar
[4] M.J.Donachie, S.J.Donachie: Superalloys: A Technical Guide (2nd edition), ASM International, Materials Park (2002).10.31399/asm.tb.stg2.9781627082679Search in Google Scholar
[5] P.Berthod: J. Alloys Compd.481 (2009) 746. 10.1016/j.jallcom.2009.03.091Search in Google Scholar
[6] Y.G.Kim: J. Mater. Sci.13 (1978) 759. 10.1007/BF00570510Search in Google Scholar
[7] E.Nold, G.Ondracek: Prakt. Metallogr.23 (1986) 268.10.1515/pm-1986-230604Search in Google Scholar
[8] W.R.Witzke: Metal. Trans. A7 (1976) 443. 10.1007/BF02642842Search in Google Scholar
[9] B.L.Chen, A.Luo, K.S.Shin, D.L.Jacobson: Refract. Metal.: State-of-the-Art, Proc. Symp. TMS Fall Meet.65 (1989).Search in Google Scholar
[10] A.Luo, J.J.Park, D.L.Jacobson, B.H.Tsao, M.L.Ramalingam: Scr. Metall. Mater.29 (1993) 729. 10.1016/0956-716X(93)90216-FSearch in Google Scholar
[11] A.Luo, J.J.Park, D.L.Jacobson, B.H.Tsao, M.L.Ramalingam: Mat. Sci. Eng. A-Struct.177 (1994) 89. 10.1016/0921-5093(94)90481-2Search in Google Scholar
[12] J.J.Park, D.L.Jacobson: Tungsten Tungsten Alloys, Proc. 1st Int. Conf. (1993) 241.Search in Google Scholar
[13] J.J.Park: Int. J. Refract. Met. H.17 (1999) 331. 10.1016/S0263-4368(99)00016-5Search in Google Scholar
[14] H.P.Gao, R.H.Zee: J. Mater. Sci. Lett.20 (2001) 885. 10.1023/A:1010915012522Search in Google Scholar
[15] P.T.B.Shaffer: Handbooks of High-Temperature Materials N°1., Materials Index, Plenum Press, 1964.10.1007/978-1-4899-6405-2_1Search in Google Scholar
[16] G.V.Samsonov: Handbooks of High-Temperature Materials N°2., Properties Index, Plenum Press, 1964.10.1007/978-1-4899-5091-8Search in Google Scholar
[17] P.Berthod, C.Conrath: Mater. Chem. Phys.143 (2014) 1139. 10.1016/j.matchemphys.2013.11.014Search in Google Scholar
[18] P.Berthod: Mater. Sci. Indian J.9 (2013) 359.Search in Google Scholar
[19] S.Michon, L.Aranda, P.Berthod, P.Steinmetz: Rev. Metall.-Paris09 (2004) 651. 10.1051/metal:2004116Search in Google Scholar
[20] L.Corona, P.Berthod: Mater. Sci. Indian J., in press.Search in Google Scholar
[21] P.Berthod, Y.Hamini, L.Aranda, L.Héricher: Calphad31 (2007) 351. 10.1016/j.calphad.2007.01.007Search in Google Scholar
© 2014, Carl Hanser Verlag, München
Articles in the same Issue
- Contents
- Contents
- Original Contributions
- Microstructure evolution at high temperature of chromium-rich iron-based alloys containing hafnium carbides
- Industrialised nanocrystalline bainitic steels. Design approach
- Impact toughness of welds deposited on H13 hot work tool steel
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- Investigation of the mechanochemical behavior of the Mg – TiO2 – H3BO3 system
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- Copper-catalyzed electroless nickel coating on poly(ethylene terephthalate) board for electromagnetic application
- Effect of boron on wear and erosion of WC – Ni vacuum brazed coating
- Short Communications
- Crystalline boron carbide grown on a diamond surface
- People
- Prof. Dr. Dieter Herlach on the occasion of his 65th birthday
- DGM News
- DGM News
Articles in the same Issue
- Contents
- Contents
- Original Contributions
- Microstructure evolution at high temperature of chromium-rich iron-based alloys containing hafnium carbides
- Industrialised nanocrystalline bainitic steels. Design approach
- Impact toughness of welds deposited on H13 hot work tool steel
- Characterization of hot flow behaviour and deformation stability of medium carbon microalloyed steel using artificial neural networks and dynamic material model
- Influence of hot working on mechanical and physical properties of an Fe – Ni – Co alloy
- Thixo-joining of D2 and M2 tool steels: analysis of microstructure and mechanical properties
- Effect of Li addition on microstructure and mechanical properties of Al – Mg – Si alloy
- Investigation of the mechanochemical behavior of the Mg – TiO2 – H3BO3 system
- Tribological and micro/nano-structural characterization of some Fe-based sintered composites
- Synthesis and oxidation behavior of Al4SiC4 – Al – Si composites
- Copper-catalyzed electroless nickel coating on poly(ethylene terephthalate) board for electromagnetic application
- Effect of boron on wear and erosion of WC – Ni vacuum brazed coating
- Short Communications
- Crystalline boron carbide grown on a diamond surface
- People
- Prof. Dr. Dieter Herlach on the occasion of his 65th birthday
- DGM News
- DGM News
