i 32 � i 2 ^ Vol.32 No.2
2012 Q 4 : Journal of Chinese Society for Corrosion and Protection Apr. 2012
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Fig.1 Inner surface of reheater tubes after 7474 h service
in the boiler at 620 � ∼630 �
30 40 50 60 70 80 90 100
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With shot peening
Without shot peening
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Fig.2 XRD pattern on the inner surface of reheater tubes
after 7474 h exposures in the boiler
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Fig.3 SEM images of inner surface of reheater tubes af-
ter service for 7474 h without (a) and with (b) shot
peening
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Fig.4 Cross-sectional images and the corresponding elemental line scans of the inner surface of reheater tubes
without (a, c) and with (b, d) shot peening
5�/,"&�|bxsaM. V>L�.� TP304H Hs�00,
Le�MxO#(m7d); [J]. Y4
3�H , 2003,
23(3): 171-174)
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steels to large scale USC boiler [A]. Viswanathan R, Gandy
D, Coleman K. Proceedings from the Fourth International
Conference on Advances in Materials Technology for Fossil
Power Plants[C]. Hilton Head Island: ASM International,
140 W2��0�F|� 32�140 W2��0�F|� 32�140 W2��0�F|� 32�
2004: 177-190
[12] Yusuke M, Akira T, Mikihito S, et al. Steam-oxidation re-
sistance of shot blasted stainless steel tubing after 10-year
service [J]. NKK Tech. Rev., 1996, 75: 1-10
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(??, 1AI. Y�* 1Cr18Ni9Ti ��1/z�dz XM
�� [J]. sd!!��2008, 37(20): 24-26)
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stainless steel [J]. Mater. Sci. Eng., 2009, R65: 39-104
EFFECT OF SHOT PEENING TREATMENT ON STEAM
OXIDATION RESISTANCE OF TP304H REHEATER TUBE
YUE Zengwu1,2, FU Min2, LI Xingeng2, TIAN Xuelei1
1. Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education,
Shandong University, Jinan 250061;
2. Shandong Electric Power Research Institute, Jinan 250002
Abstract: The inner surfaces of TP304H reheater tubes with and without shot peening were examined using
scanning electron microscope (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD) after
7474 h service at high temperature. The results showed that the shot peening treatment greatly increased
the oxidation resistance of the TP304H tubes by dramatically decreasing the growth rate while increasing the
adhesion of the oxide scale formed. The microstructural characterization also indicated that the shot peening
treatment converted the oxide scale formed on the tubes from double layers being composed of an outer layer
of iron oxides into single Cr-rich layer. It is proposed that the shot peening induces severe deformation of the
tube inner surface and leads to grain refinement and martensite generation of the steel, both of which promotes
Cr diffusivity to the surface and thus the formation of the Cr-rich oxide layer during the exposure of the tubes
at high temperature.
Key words: TP304H, shot peening, martensite, steam, oxidation
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