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| Microstructure transformation during homogenization treatment in as-cast GH742 alloy |
| PAN Xiaolin1;2; SUN Wenru2†; YANG Shulin2; LI Zhan3; GUO ShouRen2; YANG Hongcai1; HU Zhuangqi2 |
1.School of Material & Metallurgy; Northeastern University; Shenyang 110004
2.Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110016
3.Shenyang University of Science & Technology; Shenyang 110168 |
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Cite this article:
PAN Xiaolin; SUN Wenru; YANG Shulin; LI Zhan; GUO ShouRen; YANG Hongcai; HU Zhuangqi. Microstructure transformation during homogenization treatment in as-cast GH742 alloy. Chin J Mater Res, 2008, 22(6): 651-656.
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Abstract The precipitation of as-cast GH742 alloy is complicated and the dendritic segregation is severe. Niobium and titanium are segregated to the interdendritic region and enriched in the precipitates such as MC carbide, Laves phase, δ phase, (γ+γ´) eutectic. The melting temperature of as-cast GH742 alloy is 1160 determined by differential thermal analysis and metallography, while the soluble temperatures of γ´ phase,(γ+γ´)eutectic, MC carbide, Laves phase, δ phase, Ni5Ce phase and RE-O-S phase were determined by different homogenization treatments. In order to obtain uniform austenitic microstructure, a two-step homogenization treatment via low temperature pretreatment followed by high temperature diffusion is established due to the melting of RE-O-S phase at 1120 , which broadens the window of the homogenization temperature and increases the annealing temperature. The diffusion coefficient of niobium is much smaller than that of titanium, which requires more time to be absolutely homogenized.
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Received: 28 January 2008
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| 1 L.Zheng, C.Q.Gu, Y.R.Zheng, Investigation of the solidification behavior of a new Ru-containing cast Ni-base superalloy with high W content, Scripta Materialia, 50, 435(2004)
2 J.N.Dupont, C.V.Robino, J.R.Michael, M.R.Notis, A.R.Marder, Solidification of Nb-bearing superalloys: part I. reaction sequences, Metallurgical and Materials Transactions A, 29, 2785(1998)
3 W.R.Sun, S.R.Guo, D.Z.Lu, Z.Q.Hu, Effect of sulfur on the solidification and segregation in Inconel 718 alloy, Materials Letters, 31, 195(1997)
4 S.L.Semiatin, R.C.Kramb, R.E.Turner, F.Zhang, M.M.Antony, Analysis of the homogenization of a nickel-base superalloy, Scripta Materialia, 51, 491(2004)
5 R.C.Kramb, M.M.Antony, S.L.Semiatin, Homogenization of a nickel-base superalloy ingot material, Scripta Materialia, 54, 1645(2006)
6 XIE Yongjun, LIANG Xuefeng, MIU Hongbo, LI Wei, Microstructure and segregation elimination of superalloy GH742 ingot, Journal of Iron and Steel Research, 15(7), 17(2003)
(谢永军, 梁学锋, 缪宏博, 李伟, GH742合金钢锭的组织及偏析的消除, 钢铁研究学报, 15(7), 17(2003))
7 TIAN Yuliang, WANG Ling, DONG Jianxin, ZHANG Maicang, Microsegregation of GH742 ingot and the element distribution during homogenizing treatment, Rare Metal Materials and Engineering, 35(8), 1315(2006)
(田玉亮, 王玲, 董建新, 张麦仓, GH742铸锭偏析及均匀化过程中元素分布规律, 稀有金属材料与工程, 35(8), 1315(2006))
8 SUN Zhenyan, LIU Chunming, Diffusion and Phase Transformations in Alloys (Shenyang, Northeastern University Press, 2002)p.39
(孙振岩, 刘春明, 合金中的扩散与相变(沈阳, 东北大学出版社, 2002)p.39) |
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