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Acta Metall Sin  2011, Vol. 47 Issue (7): 921-926    DOI: 10.3724/SP.J.1037.2011.00165
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INVESTIGATION ON HEAT TREATMENT OF A DUPLEX STAINLESS STEEL FOR NUCLEAR POWER PLANT IMPELLER
LIANG Tian, KANG Xiuhong, HU Xiaoqiang, LI Dianzhong
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
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LIANG Tian KANG Xiuhong HU Xiaoqiang LI Dianzhong. INVESTIGATION ON HEAT TREATMENT OF A DUPLEX STAINLESS STEEL FOR NUCLEAR POWER PLANT IMPELLER. Acta Metall Sin, 2011, 47(7): 921-926.

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Abstract  Effects of heat treatment on microstructure and mechanical property of a cast duplex stainless steel used as making impeller of seawater circular pump in nuclear power plant were investigated. The results demonstrate that the impact energy and elongation
decrease sharply when heat-treated time was longer than 5 min at 800-850 ℃ or when the cooling rate was less than 7.5 ℃/min. The σ phases have been identified through SEM and XRD. The weakness of the mechanical properties is attributed to the precipitation of σ phase. With increasing aging time, the σ phase coarsened and the nucleation position moved from the γ/δ interfaces into the whole ferrite phase.
Key words:  duplex stainless steel      heat treatment      mechanical property      σ phase     
Received:  23 March 2011     
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Supported by Investigation on Fundamental Issues of Stainless Steels from SYNL, IMR, CAS
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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2011.00165     OR     https://www.ams.org.cn/EN/Y2011/V47/I7/921

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