PRECIPITATION BEHAVIOR OF THE INTERMETALLIC PHASES IN Z3CN20.09M STAINLESS STEEL FOR PRIMARY COOLANT PIPES OF NUCLEAR POWER PLANT

doi:10.3724/SP.J.1037.2012.00730

Acta Metall Sin

2013, Vol. 29

Issue (4): 415-420 DOI: 10.3724/SP.J.1037.2012.00730

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PRECIPITATION BEHAVIOR OF THE INTERMETALLIC PHASES IN Z3CN20.09M STAINLESS STEEL FOR PRIMARY COOLANT PIPES OF NUCLEAR POWER PLANT

WANG Yongqiang, HAN Jun, YANG Bin, WU Huanchun, WANG Xitao

State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083

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WANG Yongqiang, HAN Jun, YANG Bin, WU Huanchun, WANG Xitao. PRECIPITATION BEHAVIOR OF THE INTERMETALLIC PHASES IN Z3CN20.09M STAINLESS STEEL FOR PRIMARY COOLANT PIPES OF NUCLEAR POWER PLANT. Acta Metall Sin, 2013, 29(4): 415-420.

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Abstract

The precipitation behavior of the intermetallic phases in a Z3CN20.09M cast austenite stainless steel (CASS) which has been widely used in primary coolant pipes of nuclear power plants has been investigated. The content of the intermetallic phases precipitated in the CASS was calculated by using Image-pro Plus 6.0 software. And then a time-temperature-transformation (TTT) diagram for the intermetallic phases was got. The results showed that the M₂₃C₆ and σ phases were precipitated in the steel during 600-900 ℃ and 600-840 ℃ respectively. The fastest precipitation velocity for the intermetallic phases occurs at 750 ℃. Moreover, the M₂₃C₆ was found to precipitate first at ferrite/austenite phase boundaries,and then σ phase formed in ferrite. The solutionizing temperatures for the M₂₃C₆ and σ phases are 900 and 850 ℃ respectively. The volume fraction of the M₂₃C₆ in the specimen aged at 850 ℃increases with the increase of aging time first and then decreases.

Key words: Z3CN20.09M stainless steel M₂₃C₆ σ phase, precipitation behavior

Received: 11 December 2012

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	WANG Yongqiang
	HAN Jun
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	WU Huanchun
	WANG Xitao

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2012.00730 OR https://www.ams.org.cn/EN/Y2013/V29/I4/415

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