Advertisement

Thermodynamic calculation and MnS solubility of Mn-Ti oxide formation in Si-Mn-Ti deoxidized steel

  • Xiao-jun Zhuo
  • Yuan-qi Wang
  • Xin-hua Wang
  • Hae-geon Lee
Article

Abstract

Mn-Ti oxides in Si-Mn-Ti deoxidized steels after cooling in the furnace were investigated. The composition and morphology of inclusions were analyzed by using FE-SEM with EDS. Mn-Ti oxides were found to be effective sites to induce intragranular ferrite formation. The thermodynamic calculation was employed to interpret the critical condition for Mn-Ti oxide formation. Mn-Ti oxide formation was controlled not only by Mn and Ti content, but also by total oxygen content in steel. When the Mn and Ti contents were around 1.5% and 0.005%–0.01%, respectively, Mn-Ti oxide could form as the total oxygen content was 0.001%–0.002%. The experimental results were in good agreement with thermodynamic calculation results. Also, MnS solubility was examined in Mn-Ti oxide inclusion system. With an increase of MnO content in Mn-Ti oxide. MnS solubility in the oxides increased. MnS precipitation benefited from high MnO content in Mn-Ti oxide.

Key words

Si-Mn-Ti deoxided steel Mn-Ti oxide MnS intragranular ferrite thermodynamic calculation 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. [1]
    Ricks R A, Howell P R, Barritte G S. The Nature of Acicular Ferrite in HSLA Steel Weld Metals [J]. Journal of Materials Science, 1982, 17(3): 732.CrossRefGoogle Scholar
  2. [2]
    Madariaga I, Romero J L, Gutie’rrez I. Upper Acicular Ferrite Formation in a Medium-Carbon Microalloyed Steel by Isothermal Transformation: Nucleation Enhancement by CuS [J]. Metall Mater Trans, 1998, 29A(3): 1003.CrossRefGoogle Scholar
  3. [3]
    Gregg J M, Bhadeshia H K D H. Solid-State Nucleation of Acicular Ferrite on Minerals Added to Molten Steel [J]. Acta Mater, 1997, 45(2): 739.CrossRefGoogle Scholar
  4. [4]
    Ueshima Y, Yuyama H, Mizoguchi S, et al. Effect of Oxide Inclusions on MnS Precipitation in Low Carbon Steel [J]. Tetsu-to-Hagane, 1989, 75(3): 501 (in Japanese).CrossRefGoogle Scholar
  5. [5]
    Goto H, Miyazawa K, Honma H. Effect of the Primary Oxide on the Behavior of the Oxide Precipitating During Solidification of Steel [J]. ISIJ Int, 1996, 36(5): 537.CrossRefGoogle Scholar
  6. [6]
    Sawai T, Wakoh M, Mizoguchi S. Effect of Zr-Oxide Particles on the MnS Precipitation in Low S Steels [J]. Tetsu-to-Hagane, 1996, 82(7): 587 (in Japanese).CrossRefGoogle Scholar
  7. [7]
    Wakoh M, Sawai T, Mizoguchi S. Effect of Ti-Zr Oxide Particles on MnS Precipitation in Low S Steels [J]. Tetsu-to-Hagane, 1996, 82(7): 593 (in Japanese).CrossRefGoogle Scholar
  8. [8]
    Ishikawa F, Takahashi T. The Formation of Intragranular Ferrite Plates in Medium-Carbon Steels for Hot-F’orging and Its Effect on the Toughness [J]. ISIJ Int, 1995, 35(9): 1128.CrossRefGoogle Scholar
  9. [9]
    Ishikawa F, Takahashi T, Ochi T. Intragranular Ferrite Nucleation in Medium-Carbon Vanadium Steels [J]. Metall Mater Trans, 1994, 25A(5): 929.CrossRefGoogle Scholar
  10. [10]
    Takamura J, Mizoguchi S. Roles of Oxides in Steels Performance [C] //ISIJ. Proc 6th Int Iron and Steel Congr. Nagoya: ISIJ, 1990: 591.Google Scholar
  11. [11]
    Mizoguchi S, Takamura J. Control of Oxides as Inoculants [C] //ISIJ. Proc 6th Int Iron and Steel Congr. Nagoya: ISIJ, 1990: 598.Google Scholar
  12. [12]
    Sawai T, Wakoh M, Ueshima Y, et al. Effect of Zr on the Precipitation of MnS in Low Carbon Steels [C] //ISIJ. Proc 6th Int Iron and Steel Congr. Nagoya: ISIJ, 1990: 605.Google Scholar
  13. [13]
    Ogibayashi S, Yamaguchi K, Hirai M, et al. The Features of Oxides in Ti-Deoxidized Steel [C] //ISIJ. Proc 6th Int Iron and Steel Congr. Nagoya: ISIJ, 1990: 612.Google Scholar
  14. [14]
    ZHUO Xiao-jun, WANG Xin-hua, WANG Wan-jun, et al. Nature of Large (Ti, Nb)(C, N) Pecipitates During Solidification in Ti, Nb-Addition HSLA Steel [J]. Journal of University of Science and Technology Beijing, 2007, 14(2): 112.CrossRefGoogle Scholar
  15. [15]
    ZHUO Xiao-jun, WOO Dao-hee, WANG Xinhua, et al. Formation and Thermal Stability of Large Precipitates and Oxides in Titanium and Niobium Microalloyed Steel [J]. Journal of Iron and Steel Research. International, 2008, 15(3): 70.CrossRefGoogle Scholar
  16. [16]
    Shim J H, Cho Y W, Chung S H, et al. Nucleation of Intra-granular Ferrite at Ti2O3 Particle in Low Carbon Steel [J]. Acta Mater, 1999, 47(9): 2751.CrossRefGoogle Scholar
  17. [17]
    Bramfitt B L. The Effect of Carbide and Nitride Additions on the Heterogeneous Nucleation Behavior of Liquid Iron [J]. Metall Trans, 1970, 1B(10): 1987.CrossRefGoogle Scholar
  18. [18]
    Madariaga A, Gutierrez I. Role of the Particle-Matrix Interface on the Nucleation of Acicular Ferrite in a Medium Carbon Microalloyed Steel [J]. Acta Mater, 1999, 47(3): 951.CrossRefGoogle Scholar
  19. [19]
    Tomita Y, Saito N, Tsuzuki T, et al. Improvement in HAZ Toughness of Steel by TiN-MnS Addition [J]. ISIJ Int, 1994. 34(10): 829.CrossRefGoogle Scholar
  20. [20]
    Yamamoto K, Hasegawa T, Takamura J. Effect of Boron on Intra-Granular Ferrite Formation in Ti-Oxide Bearing Steels [J]. ISIJ Int, 1996, 36(1): 80.CrossRefGoogle Scholar
  21. [21]
    ZHUO Xiao-jun, WANG Xin-hua, WANG Wan-jun, et al. Thermodynamic Calculations and Experiments on Inclusions to be Nucleation Sites for Intragranular Ferrite in Si-Mn-Ti Deoxidized Steel [J]. Journal of University of Science and Technology Beijing, 2007, 14(1): 14.CrossRefGoogle Scholar
  22. [22]
    Kang Youn-Bae. Thermodynamic Studies on Phase Equilibria of MnO-SiO2 Containing Oxide Systems and Their Application to Inclusions Engineering in Steels [D]. Pohang: Pohang University of Science and Technology, 2005.Google Scholar
  23. [23]
    Henry Gaye. Inclusion Formation in Steels [C] //Alan W Cramb. The Making, Shaping and Treating of Steel; 11th Edition. Casting Volume. Pittsburgh: The AISE Steel Foundation, 2003: 1.Google Scholar
  24. [24]
    Bale C W, Chartrand P, Degterov S A, et al. FactSage Thermochemical Software and Databases [J]. Calphad, 2002, 26 (2): 189.CrossRefGoogle Scholar
  25. [25]
    Ohta M, Morita K. Thermodynamics of the MnO-Al2O3-TiO2 System [J]. ISIJ Int, 1999, 39(12): 1231.CrossRefGoogle Scholar
  26. [26]
    Kim Tae-Gyu, Lee Woo Kyung, Park Joo Hyun, et al. Sulfide Capacity and Phase Equilibria of MnO-TiO2-MnS System at 1723K [J]. ISIJ Int, 2001, 41(12): 1460.CrossRefGoogle Scholar
  27. [27]
    Ito M, Morita K, Sano N. Thermodynamics of the MnO-SiO2-TiO2 System at 1673 K [J]. ISIJ Int, 1997, 37(9): 839.CrossRefGoogle Scholar
  28. [28]
    Karsrud K. Sulfide Capacities in TiO2 Containing Slags. II—Sulfide Capacities and Activities in MnO-TiO2 Melts at 1500 °C [J]. Scand J Metall, 1984, 13: 265.Google Scholar
  29. [29]
    Chao H C, Smith Y Z, Van Vlack L H. The MnO-MnS Phase Diagram [J]. Trans TMS-AIME, 1963, 227: 796.Google Scholar

Copyright information

© China Iron and Steel Research Institute Group 2010

Authors and Affiliations

  • Xiao-jun Zhuo
    • 1
  • Yuan-qi Wang
    • 2
  • Xin-hua Wang
    • 3
  • Hae-geon Lee
    • 4
  1. 1.Technology Management SectionChina Minmetals CorporationBeijingChina
  2. 2.Department of Science and Technology InformationChina Iron and Steel Research Institute GroupBeijingChina
  3. 3.Metallurgical and Ecological Engineering SchoolUniversity of Science and Technology BeijingBeijingChina
  4. 4.Graduate Institute of Ferrous TechnologyPohang University of Science and TechnologyPohangSouth Korea

Personalised recommendations