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| Influence of Stabilization Treatment on the Intergranular Corrosion Susceptibility of Super304H Austenitic #br#Heat-resistant Steel |
| ZHANG Chunlei1** XIONG Xiahua2 ZHENG Zhijun3 GAO Yan2 |
1. China Electric Power Research Institute of Guangdong Power Grid Corp., Guangzhou 510600
2. School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640
3. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640 |
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Cite this article:
ZHANG Chunlei** XIONG Xiahua ZHENG Zhijun GAO Yan. Influence of Stabilization Treatment on the Intergranular Corrosion Susceptibility of Super304H Austenitic #br#Heat-resistant Steel. Chinese Journal of Materials Research, 2013, 27(4): 411-418.
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Abstract In order to investigate the influence of stabilization treatment on microstructure and intergranular corrosion(IGC) resistance of Super304H austenitic heat-resistant steel, the microstructure including grain size, carbide distribution, type and amount of the samples after solution and stabilization treatment were characterized by optical microscope, scanning electron microscopy, electrolytic extraction method and X-ray diffraction. The intergranular corrosion degree was evaluated by oxalic acid electrolytic etching method and double loop electrochemical potentiokinetic reactivation tests. The results show that the grain grade of Super304H can be maintained between level 7 and 10 when quenched at 1150℃ for 15 minutes. Compared with the solution state, the amount of precipitated phases increased significantly after stabilization treatment. What is more, there were many M23C6 precipitates along grain boundaries when stabilized at 950℃, indicating that 950℃ was still at sensitizing temperature for Super304H. The Nb(C, N) quantity and IGC resistance increased with the increase of stabilization temperature, and its IGC resistance was superior to the solution state when stabilizing temperature reached 1100℃, where the Nb(C, N) precipitated most Meanwhile the 1100℃ was in the range of solution temperature for Super304H and was much higher than the stabilization temperature of conventional 1Cr18Ni9Ti stainless steel. It can be drawn that the delivery state heat treatment of Super304H plays the dual function of solution and stabilization.
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