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| Thermodynamic Calculation and Analysis on Precipitated Phases in 18Cr10NiNb Heat--resistant Steel |
| YU Hongyao, DONG Jianxin, XIE Xishan |
| School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083 |
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Cite this article:
YU Hongyao DONG Jianxin XIE Xishan. Thermodynamic Calculation and Analysis on Precipitated Phases in 18Cr10NiNb Heat--resistant Steel. Chin J Mater Res, 2010, 24(5): 449-454.
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Abstract Long-term aging at 650℃ for the austenitic heat-resistant steel 18Cr10NiNb was conducted till 10,000 h. Effect of aging time on microstructure was investigated by SEM and TEM, and the effects of Nb, C, and N content on equilibrium phases from 500℃ to 1400℃ in 18Cr10NiNb steel have been calculated by using Thermo-Calc software. The results show that Nb-rich MX phase particles precipitate in the grains and Cr-rich M23C6 carbide mainly precipitates at the grain boundaries. The main equilibrium phases in18Cr10NiNb steel at 500--1400℃ are MX, M23C6 and σ. The solution temperatures of MX and M23C6 are about 1340℃ and 840℃, respectively. The amount of MX phase increases with increasing of C and Nb contents. The amount of σ phase decreases with increasing of C content. Adding 0.2%N in this the steel, MX phase contains N, Nb, Cr with a small amount of C, which is a complex carbon nitride and makes excellent strengthen effect. Cr2N phase appears as one of the equilibrium phases in the steel at the same time.
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Received: 18 May 2010
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| Fund: Supported by National Natural Science Foundation of China No.50931003. |
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