EFFECT OF SHOT PEENING TREATMENT ON STEAM OXIDATION RESISTANCE OF TP304H REHEATER TUBE

J Chin Soc Corr Pro

2012, Vol. 32

Issue (2): 137-140 DOI:

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EFFECT OF SHOT PEENING TREATMENT ON STEAM OXIDATION RESISTANCE OF TP304H REHEATER TUBE

YUE Zengwu^1,2, 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

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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

Received: 13 December 2010

ZTFLH:

TG174

Corresponding Authors: TIAN Xuelei E-mail: tianxuelei@sdu.edu.cn

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YUE Zengwu, FU Min, LI Xingeng, TIAN Xuelei. EFFECT OF SHOT PEENING TREATMENT ON STEAM OXIDATION RESISTANCE OF TP304H REHEATER TUBE. J Chin Soc Corr Pro, 2012, 32(2): 137-140.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2012/V32/I2/137

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