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| Effect of Shot Peening on Oxidation Resistance of Super 304H Steel in Supercritical Steam |
Yunhai MA( ) |
| Shanghai Power Equipment Research Institute, Shanghai 200240, China |
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Abstract Oxidation behavior of the shot-peened and bare Super 304H austenitic stainless steel was investigated in 650 ℃/27 MPa steam for 1000 and 2000 h, by means of scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD) and optical microscopy (OM). It was observed that the oxidation resistance of the Super 304H steel was effectively improved by shot peening. Furthermore, spallation of oxide scale was only observed on the bare Super 304H steel after oxidation for 2000 h. The improvement of oxidation resistance could be attributed to the fact that the shot peening process produced a surface layer of ultra-fine grains with plenty of grain boundaries, sub-grain boundaries and dislocations, which enhanced the diffusion of Cr to form a layer of high density of Cr-rich oxides on the surface. Therefore, the shot peening processing is an effective approach, which not only improved the oxidation resistance to supercritical steam, but also mitigated the exfoliation of oxide scale formed on Super304H steel.
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Received: 13 June 2018
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| Fund: National Key Research and Development Program of China(2016YFC0801901);National Key Research and Development Program of China(2017YFB030-5205) |
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Corresponding Authors:
Yunhai MA
E-mail: mayunhai@speri.com.cn
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