Journal of Northeastern University Natural Science ›› 2014, Vol. 35 ›› Issue (4): 504-507.DOI: 10.12068/j.issn.1005-3026.2014.04.011

• Materials & Metallurgy • Previous Articles     Next Articles

Precipitation Behavior of σ Phase in Duplex Stainless Steel 2205

MA Ming1, DING Hua1, TANG Zhengyou1, LI Guoping2   

  1. 1. School of Material & Metallurgy, Northeastern University, Shenyang 110819, China; 2. Shanxi Taiyuan Stainless Steel Co., Ltd., Taiyuan 030003, China.
  • Received:2013-07-21 Revised:2013-07-21 Online:2014-04-15 Published:2013-11-22
  • Contact: MA Ming
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Abstract: The effects of aging conditions on the morphology features of precipitates of DSS (duplex stainless steel) 2205 after solution treatment were observed by OM, and the precipitation process of σ phase at 800℃ were analyzed. In order to investigate the precipitation characteristics and the mechanisms of σ phase, the microstructure of the sample by aging treatment at 800℃ for 240min was studied by EDS, XRD, TEM and EP. The results showed that σ phase which precipitates by the reaction δ→γ2+σ is an FeCrMo intermetallic compound and the crystal structure is tetragonal, and the diffusion of alloying elements Mo mainly affected its formation. After the same aging time, σ phase precipitates severely at 800℃ and slightly at 950℃.

Key words: duplex stainless steel, σ phase, isothermal ageing, microstructure, electron probe

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