SAF2507双相不锈钢二次急冷淬火成形析出相的析出行为

doi:10.11896/cldb.23100100

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Abstract The forming of SAF2507 duplex stainless steel (SAF2507 DSS) propeller blade was carried out by the technique of secondary quench stamping. The precipitated phase precipitation behavior during SAF2507 DSS forming was studied by scanning electron microscopy (SEM), EDAX energy dispersive spectrometer (EDS), transmission electron microscopy (TEM), etc. The results show that σ phase and χ phase are the main precipitates during SAF2507 DSS secondary quench stamping. The forming temperature and cooling rate are the key factors to determine the precipitation behavior. There exists a transition temperature for both σ and χ phase precipitation during secondary quench stamping. When the temperature is less than 950 ℃, the amount of σ phase increases with the increase of temperature, and when the temperature is greater than 950 ℃, the amount of σ phase decreases with the increase of temperature. When the temperature is less than 850 ℃, the amount of χ phase increases with the increase of temperature. When the temperature is more than 850 ℃, the precipitation of χ phase stopped and gradually transforms into σ phase. During rapid cooling, σ phase and χ phase nucleate and precipitate effectively, and there is a precipitation critical cooling rate v_σ and v_χ. When the cooling rate is greater than the critical cooling rate, neither σ phase nor χ phase can nucleate and precipitate effectively. In addition, many factors such as the long distance diffusion and segregation of Cr, Mo and Ni in SAF2507 DSS, surface oxidation and surface oxides, and grain refinement under forming force, can affect the nucleation and precipitation of σ phase and χ phase during the secondary quench stamping too.

Key words： SAF2507 duplex stainless steel secondary quench stamping precipitated phase stamping temperature critical cooling rate

Published: 10 May 2025 Online: 2025-04-28

CLC number:	TG172.8
	TG142.71

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	GUO Youdan
	CHENG Xiaonong

Cite this article:

GUO Youdan,CHENG Xiaonong. Precipitation Behaviors of SAF2507 Duplex Stainless Steel Precipitated Phase by Secondary Quench Stamping[J]. Materials Reports, 2025, 39(9): 23100100-7.

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https://www.mater-rep.com/EN/10.11896/cldb.23100100 OR https://www.mater-rep.com/EN/Y2025/V39/I9/23100100

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