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Ultrafine grain effect on pearlitic transformation in hypereutectoid steel

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Abstract

Pearlitic transformation in an ultrafine-grained (UFG) hypereutectoid steel was investigated. The steel was a plain carbon steel containing 1.0 wt% C and very few other elements. The UFG samples were prepared by thermomechanical treatment, and an average grain size of approximately 1 μm was achieved. The pearlitic transformation was conducted by heating the UFG samples at 1023 K for different times and then cooling in air. A new pearlitic transformation phenomenon was observed: traditional lamellar pearlite can be observed only when the grain size increases to a dimension larger than approximately 4 μm, which is a critical value. When grain size is smaller than this value, the pearlitic transformation occurs in the form of divorced eutectoid, and the microstructure is the ferrite matrix with granular cementite. This research indicates that grain size has a great influence on pearlitic transformation by shortening the diffusion distance and increasing the diffusion rate of carbon atoms in the UFG steel.

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ACKNOWLEDGMENTS

The authors are grateful for financial support from China National Science Foundation in Grant Nos. 50871082 and 51271137.

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Authors and Affiliations

  1. School of Materials Science, State Key Laboratory of Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an, 710049, People’s Republic of China

    Fu Liang Lian, Hong Ji Liu, Jun Jie Sun, Xue Jiao Sun, Sheng Wu Guo & Yong Ning Liu

  2. State Key Laboratory of Rolling Technology and Automation, Northeastern University, Shenyang, 110819, People’s Republic of China

    Lin Xiu Du

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  1. Fu Liang Lian
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Correspondence to Yong Ning Liu.

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Lian, F.L., Liu, H.J., Sun, J.J. et al. Ultrafine grain effect on pearlitic transformation in hypereutectoid steel. Journal of Materials Research 28, 757–765 (2013). https://doi.org/10.1557/jmr.2012.397

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  • DOI: https://doi.org/10.1557/jmr.2012.397

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