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Effects of Cr, B, Ti and Si on Rolling Characteristics in Fe-30at.%A1 Alloy  

Choi, Dap-Chun (Dept.of Materials Science and Engineering, Chonnam National Univ.)
Lee, Ji-Sung (Dept.of Materials Science and Engineering, Chonnam National Univ.)
Publication Information
Journal of Korea Foundry Society / v.23, no.2, 2003 , pp. 77-85 More about this Journal
Abstract
Some alloying elements such as Cr, B, Ti and Si were added individually or as a mixture to Fe-30 at.%Al alloys. The alloys were melted using an arc furnace and then heat-treated for homogenization at 1000$^{\circ}C$ for 7 days and followed by rolling at 1000$^{\circ}C$. The alloying elements on rolling characteristics were investigated by the microstructures and fracture mode before and after rolling. The microstructures before rolling showed that all of the alloys had equiaxed grains. On the other hand, the microstructures of rolling plane as well as its perpendicular plane became elongated after rolling. The alloys such as Fe-30Al, Fe-30Al-3Ti, Fe-30Al-0.5B, Fe-30Al-5Cr and Fe-30Al-3Ti-0.5B revealed better rolling behaviour from the point that intergranular and cleavage fractures were not fundamentally occurred. But the addition of 5Ti or 3Si to Fe-Al alloys had detrimental effects. The Ti-added alloy system such as Fe-30Al-5Ti, Fe-30Al-5Ti-5Cr, Fe-30Al-3Ti-5Cr and Fe-30Al-5Ti-0.5B were cracked through grain and showed cleavage fracture. The Si-added alloy system such as Fe-30Al-5Si, Fe-27Al-3Si and Fe-27Al-5Cr-3Si were cracked along the grain boundary and showed intergranular fracture. $DO_3{\leftrightarrow}B_2$ transition temperature of Fe-30at.%Al alloy was 520$^{\circ}C$, whereas the addition of 3Ti and 3Ti+0.5B comparably increased the temperature to 797 and 773$^{\circ}C$, respectively.
Keywords
Rolling; Fracture mode; Equiaxed grains; Transition temperature; Intergranular fracture; Cleavage fracture;
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1 R. T. Fortnum and D. E. Mikkola : Mater. Sci. and Eng., 'Effects of molybdenum, titanium and silicon additions on the D0,<-'B2 transition temperature for alloys near FegAl', 91(1987)223-231   DOI   ScienceOn
2 A. Agarwal, R. Balasubramaniam and S. Bhargava : Metall. and Mater. Trans. A, 'Effect of thennomechanical treat-ments on the room-temperature mechanical behavior of iron aluminide $Fe_3Al$', 27A(1996) 2985-2993
3 Y. D. Huang, W. Y. Yang, G. L. Chen and Z. Q. Sun : Inter-metallics, 'On the effect of B21hennomechanical treatment in improving the room temperature ductility of $Fe_3Al$-basedalloys', 9(2001)331-340
4 Sung-Su Kim, Sung-Min Joo, Seon-Hun Oh, Kwan-Hyu Kim, Dap-Chun Choi: J. of the Korean Foundrymen's Soci-ety, 'Effects of titanium, hafnium and zirconium alloying elements on microstructures and $DO_3\leftrightarrow$B2 transition tem-perature of Fe-30A1-5Cr alloys', 21(2001) 15-23
5 C. T. Liu, E. H. Lee and C. G. McKamey : Scripta Metall. Mater., 'An environmental effects as the major cause for room temperature', 23(1989) 875-880   ScienceOn
6 Sokeizai Center: The Mater. Process Tech. Center(Sokeizai Center), 'Intermetallic Compound', Tokyo, (1996) 37-38
7 Kwang-II Park, Sung-Min Joo and Dap-Chun Choi : J. of the Korean Inst. Met. and Mater., 'Effects of Cr, Mo, Nb and B additions on the microstructure and mechanical Prop-erties in Fe-25at. % A1 alloy', 35(1997) 305-312
8 Y. D. Huang, W. Y. Yang, Z. Q. Sun : Mater. Sci. and Eng., 'Improvement of room temperature tensile properties for $Fe_3Al$-based alloys by thermomechanical and annealing process', A263( 1999)75-84
9 C. T. Liu and E. P. George : MRS Symp. Proc. vo1.213, 'In High-Temperature Ordered Intermetallics IV', MRS(1991) 527-532
10 Edited by J. H. Westbrook and R. L. Fleischer: John Wiley & Sons, 'Intei-metallic Compounds vo1.2', New York, (1995) 199-209
11 C. G. McKamey and C. T. Liu : Scripta Metall. Mater., 'Chromium addition and environmental embrittlement in $Fe_3Al$', 24(1990) 2119-2122   DOI   ScienceOn
12 R. S. Diehm, M. P. Kemppainen and D. E. Mikkola : Mater. Manuf. Process Mat. Man. Proc. 4, 'Processing and A110y-ing of Modified Iron Aluminides', (1989) 61-72   ScienceOn
13 C. G. McKamey, J. H. DeVan, P. F. Tortorelli and V. K. Sikka: J. of Mater. Res., 'A review of recent developments in FegAl-based alloys', 6(1991) 1779-1805   DOI
14 Edited by A. K. Koul, V.R.Parameswaran, J-P.Immarigeon and W.Wallace : National Research Council of Canada, 'Advances in High Temperature Structural Matehal and Protective Coatings', Ottawa, (1994) 296-308
15 B. Voyzelle and J. D. Boyd: Mater. Sci. & Eng., 'High-tem-perature deformation behaviour of $Fe_3Al$', A258(1998) 243-248
16 P. R. Swann, W. R. Duff and R. M. Fisher : Metall. Trans., 'Electron metallography of ordering reactions in Fe-Al alloys', 3(1972) 409-419
17 V. K. Sikka, S. Viswanathan and C. G. Mckamey : Proc. Inter. Symp. -Structural Intermetallics, 'Development and commercialization status ofFe-,A1-based intel-metallic alloys', TMS(1993)483-491
18 S. P. Chen, A. F. Voter, R. C. Albers, A. M. Boring and P. J. Hay : Scripta. Metall., 'Theoretical studies of grain bound-aries in $Ni_3Al$ with boron or sulfur', 23(1989) 217-222   DOI   ScienceOn
19 R. S. Diehm and D. E. Mikkola : MRS Symp. Proc. vol.Sl, 'In High-Temperature Ordered Intel-metallic Alloys II' MRS( 1987) 329-334
20 C. T. Liu : Scripta Metall. Mater., 'Environmental embrit-tlement and grain boundary fracture in Ni,A1', 27(1992) 25-28   DOI   ScienceOn
21 Edited by N. S. Stoloffand V. K. Sikka : Chapman & Hall, 'Physical Metallutgy and Processing of Intermetallic C'm-pounds', New York, (1996) 351-391
22 C. G. McKamey, J. A. Horton and C. T. Liu : J. of Mater. Res., 'Effect of chromium on properties ofFe,A1', 4(1989)1156-1163   DOI   ScienceOn