Effects of Rare Earth Addition on the Inclusions and Mechanical Properties of 2205 Duplex Stainless Steel

Abstract:

The effects of rare earth metals on the inclusions and the mechanical properties of 2205 duplex stainless steel were studied by metallographic examination, scanning electron microscope (SEM) and energy spectrum analysis. The results show that the morphologies and sizes of non-metallic inclusions in 2205 duplex stainless steel are changed, and rare earth metals played a very good role of modifying inclusions. The fracture mode of 2205 duplex stainless steel is typical cleavage fracture, but quasi-cleavage and dimple fracture after adding RE into the steel, and the spherical inclusions of rare earth oxysulfide in the dimple are the main factors for this transformation. The transverse impact toughness of 2205 duplex stainless steel is improved obviously by RE. In comparison with 2205 duplex stainless steel without RE, the transverse impact toughness of 2205 duplex stainless steel with RE is increased 20.49% at -40°C, and the room temperature strength are improved, the elongation and reduction of area have been improved 11.67%, 24.55% respectively.

• Periodical: Advanced Materials Research (Volumes 503-504)
• Pages: 463-468
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.503-504.463
• Online since: April 2012
• Authors: Xiao Liu, Long Mei Wang
• Keywords: Duplex Stainless Steel, Inclusion, Mechanical Property, Rare Earth (RE)

References

[1] L.H. Chiu, W.C. Hsieh and C.H. Wu: Materials Science and Engineering A, Vol. 354 (2003), p.82.

[2] K.H. Lo, J.K.L. Lai, C.H. Shek and D.J. Li: Materials Science and Engineering A, Vol. 452–453 (2007), p.149.

[3] V. Calonne, C. Berdin, B. Saint-Germain and S. Jayet-Gendrot: Journal of Nuclear Materials, Vol. 327 (2004), p.202.

DOI: 10.1016/j.jnucmat.2004.02.010

[4] A. El-Batahgy, B. Zaghloul: Materials Characterization, Vol. 54 (2005), p.246.

[5] J.D. Kwon, J.C. Park, Y.S. Lee, W.H. Lee and Y.W. Park: Key Engineering Materials, Vol. 183-187 (2000), p.577.

[6] G. Fargas, M. Anglada and A. Mateo: Journal of Materials Processing Technology, Vol. 209 (2009), p.1770.

[7] Soon-Hyeok Jeon, Soon-Tae Kim, In-Sung Lee and Yong-Soo Park: Corrosion Science, Vol. 52 (2010), p.3537.

[8] Longmei Wang, Qin Lin, Jingwen Ji and Denian Lan: Journal of Alloys and Compounds, Vol. 408-412 (2006), p.384.

[9] Longmei Wang: Journal of the Chinese Rare Earth Society, Vol. 22 (2004), p.48 (in Chinese).

[10] Longmei Wang, Denian Lan and Lijie Yue: Chinese Rare Earths, Vol. 24 (2003), p.10 (in Chinese).