Investigation on metallurgical factors controlling charpy impact toughness in 1Cr21Ni5Ti duplex stainless steel

  • Zhuo-yue YangEmail author
  • Jie Su
  • Ya-ming Wang


Based on the fact that toughness degradation occurred in 1Cr21Ni5Ti duplex stainless steel during slow cooling in a temperature interval of 400–600 °C following brazed welding, a simulated embrittlement treatment was utilized to evaluate its embrittlement tendency. Accumulated experiences have shown that high Ti and Al contents led frequently to severe toughness deterioration. To elucidate this phenomenon, four heats with various Ti and Al contents were prepared in laboratory-scale melts, which were used to investigate the inherent embrittlement nature. The results have shown that 550 °C aging led only to a modest toughness reduction, whereas, aging around 475 °C resulted in ferrite embrittlement, regardless of Ti, Al levels. However, high Ti, Al levels reduced the austenite phase, which, in the case of its inferior shape and distribution due to insufficient hot deformation, failed to resist cleavage-type cracks initiated in the ferrite phase. Increasing hot-forged areas reduction could modify the shape and distribution of austenite, resulting in the enhanced resistance of the austenite to the cleavage-type cracks, which have been confirmed to be beneficial for brittlement suppression of 1Cr21Ni5Ti duplex stainless steel.

Key words

1Cr21Ni5Ti steel embrittlement Ti content Al content impact toughness 


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  1. 1.
    LEI De-jiang. Discussion on Some Problems of 1Cr21Ni5Ti Steel [J]. Sichuan Metallurgy, 2001, (3): 4 (in Chinese).Google Scholar
  2. 2.
    WANG Li-yun. Research on the Embrittlement of 1Cr21Ni5Ti Steel [J]. Special Steel Technique, 2001, (1): 58 (in Chinese).Google Scholar
  3. 3.
    SU Jie, YANG Zhuo-yue, CHEN Jia-yang. Embrittlement Characteristic of 1Cr21Ni5Ti Duplex Stainless Steel Aged at 400–600 °C [A]. The Chinese Society for Metals, eds. Proceedings of Second International Conference on Advanced Structural Steels (ICASS 2004) [C]. Beijing: The Chinese Society for Metals, 2004. 792.Google Scholar
  4. 4.
    YANG Zhuo-yue, CHEN Jia-yang, SU Jie. Embrittlement Occurrence and Toughness Improvement in 1Cr21Ni5Ti Duplex Stainless Steel [A]. Stainless Steel Council of China Special Steel Enterprises Association, eds. 2nd Beijing International Duplex Stainless Steel Conference 2006 [C]. Beijing: Stainless Steel Council of China Special Steel Enterprises Association, 2006. 53.Google Scholar
  5. 5.
    Tavares S S M, Noronha R F, Silva M R, et al. 475 °C Embrittlement in a Duplex Stainless Steel UNS S31803 [J]. Materials Research, 2001, 4(4): 237.CrossRefGoogle Scholar
  6. 6.
    Terada M, Hupalo M F, Costa I, et al. Effect of Alpha Prime Due to 475 °C Aging on Fracture Behavior and Corrosion Resistance of DIN 1. 475 and MA 956 High Performance Ferritic Stainless Steels [J]. Journal of Materials Science, 2008, 43 (2): 425.CrossRefGoogle Scholar
  7. 7.
    Nilsson J-O. Super Duplex Stainless Steel [J]. Material Science and Technology, 1992, 8(8): 685.CrossRefGoogle Scholar
  8. 8.
    Sourmail T. Precipitation in Creep Resistant Austenitic Stainless Steels [J]. Materials Science and Technology, 2001, 17 (1): 1.CrossRefGoogle Scholar
  9. 9.
    Iza-Mendia A, Pinol-Juez A, Urcola J J, et al. Microstructural and Mechanical Behavior of a Duplex Stainless Steel Under Hot Working Condition [J]. Metallurgical and Materials Transactions, 1998, 29A(12): 2975.CrossRefGoogle Scholar
  10. 10.
    Maki T, Furuhara T, Tsuzaki K. Microstructure Development by Thermomechanical Processing in Duplex Stainless Steel [J]. ISIJ International, 2001, 41(6), 571.CrossRefGoogle Scholar
  11. 11.
    Balancin O, Hoffmann W A M, Jonas J J. Influence of Micro-structure on the Flow Behavior of Duplex Stainless Steels at High Temperature [J]. Metallurgical and Materials Transactions, 2000, 31A(5): 1353.CrossRefGoogle Scholar
  12. 12.
    Duprez L, Cooman B C D, Akdut N. Flow Stress and Ductility of Duplex Stainless Steel During High-Temperature Torsion Deformation [J]. Metallurgical and Materials Transactions, 2002, 33A(7): 1931.CrossRefGoogle Scholar
  13. 13.
    Keichel J, Foct J, Gottstein G. Deformation and Annealing Behavior of Nitrogen Alloyed Duplex Stainless Steels. Part I: Rolling [J]. ISIJ International, 2003, 43(11): 1781.CrossRefGoogle Scholar

Copyright information

© China Iron and Steel Research Institute Group 2009

Authors and Affiliations

  1. 1.Institute of Structure MaterialsCentral Iron and Steel Research InstituteBeijingChina
  2. 2.Steel Tube DepartmentChina Iron and Steel Research Institute GroupBeijingChina

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