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Effect of crystalline grain structures on the mechanical properties of twinning-induced plasticity steel

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Abstract

In order to improve the mechanical properties of twinning-induced plasticity steel, the grain morphology was tailored by different solidification technologies combined with deformation and heat treatment processing routes. Three typical grain morphologies, i.e., equiaxed, columnar as well as equiaxed/columnar grains were formed, and their mechanical behaviors were comparatively studied. Among the three materials, the equiaxed grain material exhibited the highest strength but the lowest plasticity. Depending on the grain size, the smaller the grain size, the higher the strength, but the lower the elongation. The columnar grain material possessed the most excellent plasticity but the weakest strength. These properties presented a non-monotonic dependence on the dendrite spacing, and the moderate spacing resulted in the optimum combination of strength and plasticity. The equiaxed/columnar grain coexisted material showed interesting properties, i.e., the strength and plasticity were just between those of single grain-shaped materials. The three materials also presented different strain hardening behaviors particularly in the uniform deformation stage. The equiaxed grain material showed a constant strain hardening rate, while the columnar grain and equiaxed/columnar grain materials showed a progressively increasing rate with increasing the true strain.

Graphical abstract

The introduction of equiaxed grains into the columnar grain material obviously enhances the strength but weakens the plasticity of the material. However, it seems that an appropriate amount of equiaxed grains will provide the material an optimum combination of strength and plasticity.

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Acknowledgments

This work was jointly supported by the key direction project of Chinese Academy of Sciences on the high speed rail and the National Natural Science Foundation of China (Grant 51371167).

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Authors and Affiliations

  1. Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei, 230031, China

    Kun Wang, Dan Wang & Fusheng Han

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  1. Kun Wang
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  2. Dan Wang
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  3. Fusheng Han
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Correspondence to Fusheng Han.

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Wang, K., Wang, D. & Han, F. Effect of crystalline grain structures on the mechanical properties of twinning-induced plasticity steel. Acta Mech. Sin. 32, 181–187 (2016). https://doi.org/10.1007/s10409-015-0513-7

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  • DOI: https://doi.org/10.1007/s10409-015-0513-7

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