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| PRECIPITATES IN HR3C STEEL AGED AT HIGH TEMPERATURE |
| FANG Yuanyuan1), ZHAO Jie1), LI Xiaona1, 2) |
1) School of Material Science and Engineering, Dalian University of Technology, Dalian 116085
2) Key Laboratory of Materials Modification by Laser, Ion and Electron Beams of Ministry of Education Dalian University of Technology, Dalian 116085 |
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Cite this article:
FANG Yuanyuan ZHAO Jie LI Xiaona. PRECIPITATES IN HR3C STEEL AGED AT HIGH TEMPERATURE. Acta Metall Sin, 2010, 46(7): 844-849.
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Abstract HR3C steel (Fe-25Cr-20Ni-Nb-N) is a new type of austenitic heat-resistant steel which has been widely used for super-heater and re-heater tubes in the ultra supercritical pressure (USC) boiler. The mechanical properties of HR3C steel were dependent on the stability of the microstructure, particularly the large amount of precipitates formed during service. This work was focused on the change of microstructure and the precipitations of HR3C steel after thermal aging for 500 h at 750℃. The results indicated that the major precipitates were variform M23C6 carbides and NbCrN nitrides. M23C6 carbides precipitated on grain boundaries and in intragranular. Fine and dispersed NbCrN nitrides were found to precipitate in intragranular. The hardness of HR3C steel had been improved through dispersed M23C6 and fine NbCrN precipitates after thermal aging for 500 h at\linebreak 750℃. All the M23C6 carbides, with lattice parameter of three times of the austenite matrix, grown in a cube to cube orientation relationship with the matrix. Some of the M23C6 carbides which precipitated on grain boundaries were transformed into σ phase.
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Received: 19 January 2010
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| Fund: Supported by High Technology Research and Development Program of China (No.2006AA04Z421) |
| [1] Yang F, Zhang Y L, Ren Y N, LiWM. New Heat–resistant Steels Welding. Beijing: China Electric Power Press, 2006: 143
(杨富, 章应霖, 任永宁, 李为民. 新型耐热钢焊接. 北京: 中国电力出版社, 2006: 143)
[2] Masuyama F. ISIJ Int, 2001; 41: 612
[3] Park I, Masuyama F, Endo T. Key Eng Mater, 2000; 171–174: 445
[4] Iseda A, Okada H, Semba H, Igarashi M. Energy Mater, 2007; 2(4): 199
[5] Komai N, Igarashi M, Minami Y, Mimura H, Masuyama F, Prager M, Boyles P R. 2007 Proc ASME Pressure Vessels and Piping Conference–8th International Conference on Creep and Fatigue at Elevated Temperatures–CREEP, New York: ASME, 2008: 2039
[6] Igarashi M, In: Yagi K, Merkling G, Kern T U, Irie H, Warlimont W eds., Landolt–Bornstein: Numerical Data and Functional Relationships in Science and Technology, Group VIII: Advanced Materials and Technologies, Berlin: Springer–Verlag, 2004; 2: 292
[7] Saito N, Komai N. 2007 Proc ASME Pressure Vessels and Piping Conference–8th International Conference on Creep and Fatigue at Elevated Temperatures–CREEP, New York: ASME, 2008: 211
[8] Chen T H, Yang J R. Mater Sci Eng, 2001; A311: 28
[9] Zhang Y W, Li D J, Wang F G. Corros Sci Prot Technol, 2002; 14: 202
(张扬伟, 李德俊, 王富岗. 腐蚀科学与防护技术, 2002; 14: 202)
[10] Sourmail T, Bhadeshia H K D H. Metall Mater Trans, 2005; 36A: 23
[11] Okada H, Igarashi M, Yamamoto S, Miyahara O, Iseda A, Komai N, Masuyama F. 2007 Proc ASME Pressure Vessels and Piping Conference–8th International Conference on Creep and Fatigue at Elevated Temperatures–CREEP, New York: ASME, 2008: 181
[12] Giordani E J, Jorge Jr A M, Balancin O. Scr Mater, 2006; 55: 743
[13] MatayaMC, Perkins C A, Thompson SW,Matlock D K. Metall Mater Trans, 1996; 27A: 1251 |
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