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Dynamic recrystallization behavior of 35CrMo structural steel

  • Zhang Bin 
  • Zhang Hong-bing 
  • Ruan Xue-yu 
Article

Abstract

The dynamic recrystallization behavior of 35CrMo steel was studied with compression test in the temperature range of 1 223–1 423 K and the strain rate range of 0.01–10.00 s−1. The initiation and evolution of dynamic recrystallization were investigated with microstructure analysis and then the critical strain ɛc for dynamic recrystallization initiation, the strain for maximum softening rate ɛ* and the steady strain ɛs were obtained to be 2.92×10−3Z0.1381, 1.60 × 10−3Z0.1780 and 3.26 × 10−2 × Z0.0972 respectively by analysis of work-hardening rate-strain θ-ɛ curves, where Z is the Zener-Hollomon parameter. The dynamic recrystallization fraction was determined using recrystallization theory, and the effects of initial grain size, strain rate and deformated temperature on the dynamic recrystallization kinetics were investigated. The results show: \(X_{DRX} = 1 - \exp (\frac{{\varepsilon - \varepsilon _c }}{{\varepsilon _s - \varepsilon _c }})^{2.28} )\), the dynamic recrystallization fraction is slightly delayed due to the somewhat larger initial grain size and markedly delayed with the decrease of temperature. On the other hand, it is significantly accelerated with the increase of the strain rate. Finally, the relationships between the initiation time, ending time of dynamic recrystallization and the deformed temperature were analyzed in detail.

Key words

dynamic recrystallization θ-ɛ curve recrystallization kinetics initial grain size 

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References

  1. [1]
    DOU Xiao-feng, LU Shou-li, ZHOU Hui. Establishment of the dynamic recrystallization model of Q235 [J]. Journal of University of Science and Technology (in Chinese), 1998, 20(5): 467–470.Google Scholar
  2. [2]
    Roucoules C, Yue S, Jonas J J. Alloying element on metadynamic recrystallization in HSLA steels [J]. Metallurgical & Materials Transaction A, 1995, A26 (2): 181–190.CrossRefGoogle Scholar
  3. [3]
    Laasraoui A, Jonas J J. Recrystallization of austenite after deformation at high temperature and strain ratesanalysis modeling [J]. Metallurgical Transaction 1991, A22 (1): 151–160.CrossRefGoogle Scholar
  4. [4]
    Sellars C M. Modelling microstructural development during hot rolling[J]. Materials Science and Technology, 1990, 6(11):1072–1081.CrossRefGoogle Scholar
  5. [5]
    Ko B C, Park K, Yoo Y C. Hot deformation behaviour of SiCp/2024 aluminium alloy composites refinforced with various sizes of SiCp [J]. Materials Science and Technology, 1998, 14(8): 765–769.CrossRefGoogle Scholar
  6. [6]
    Yada H. For accelerated cooling of rolled steel[M]. Candan: Riso National Laboratory Press, 1987.Google Scholar
  7. [7]
    Devadas C, Samarasekera I V, Hawbolt E B. The thermal and metallurgical state of steel strip during hot rolling. Part III: microstructural evolution [J]. Metallurgical Transaction A, 1991, 22A (2): 335–349.CrossRefGoogle Scholar
  8. [8]
    Djaic R A, Jonas J J. Static recrystallization of austenite between intervals of hot working [J]. Journal of the Iron and Steel Institute, 1972, 210(3): 256–261.Google Scholar
  9. [9]
    Mavropoulos L T, Jonas J J. Effect of the combined addition of Niobium and Boron on static recrystallization in hot worked austenite[J]. Canadian Metallurgical Quarterly, 1988, 27(3):235–246.CrossRefGoogle Scholar
  10. [10]
    Luton M J, Jonas J J. Kinetics of recovery and recrystallization in polycrystallization copper [J]. Acta Metallurgical, 1979, 28(5):729–743.Google Scholar
  11. [11]
    Ruibal E, Urcola J J, Fuentes M. Static recrystallization kinetics, recrystallized grain, and grain growth kinetics after hot deformation of a low-alloy steel[J]. Zeltschrift Fur Metallkunde, 1985, 76(8):568–576.Google Scholar

Copyright information

© Central South University 2003

Authors and Affiliations

  • Zhang Bin 
    • 1
  • Zhang Hong-bing 
    • 2
  • Ruan Xue-yu 
    • 1
  1. 1.Department of Plasticity Forming EngineeringShanghai Jiaotong UniversityShanghaiChina
  2. 2.Department of Materials EngineeringInstitute of Shanghai TechnologyShanghaiChina

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