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Effect of Strain on Microstructure Evolution of 1Cr18Ni9Ti Stainless Steel During Adiabatic Shearing

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Abstract

Dynamic shear test was conducted on the hat-shaped specimen of the thermo-mechanical-processed 1Cr18Ni9Ti stainless steel by using the split Hopkinson pressure bar at ambient temperature. The effect of the shear strain on the microstructure evolution was investigated during adiabatic shearing. The results revealed that the development of adiabatic shear localization went through three stages, including the incubation period, the development stage, and the maturity period. TEM observations showed that the grains in the shear region were elongated, and the elongated grains were gradually evolved into equiaxed nano-grains of 100 nm as shear strain increased. The rotational dynamic recrystallization kinetics calculation showed that subgrains had sufficient time to generate an equiaxed microcrystalline structure by rotation within the deformation time. Based on the observation of the evolution of dislocations and sub-grains in the adiabatic shear region, a model of the microstructure evolution was established during the adiabatic shearing.

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Acknowledgments

This work is supported by the National Natural Science Foundation of China (No. 51274245), NSAF (No. U1330126), the Ph.D. Programs Foundation of Ministry of Education of China (No. 20120162130006), the key project of State Key Laboratory of Explosion Science and Technology (No. KFJJ11-1), and the Natural Science Fund of Hunan (No. 14 jj2011).

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Authors and Affiliations

  1. School of Material Science and Engineering, Central South University, Changsha, 410083, China

    Y. Yang, L. H. Jiang & S. H. Luo

  2. Institute of Fluid Physics, Chinese Academy of Engineering Physics, Mianyang, 621900, China

    Y. Yang, H. B. Hu & T. G. Tang

  3. State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing, 100081, China

    Y. Yang & Q. M. Zhang

  4. Key Laboratory of Ministry of Education for Nonferrous Metal Materials Science and Engineering, Central South University, Changsha, 410083, China

    Y. Yang

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  1. Y. Yang
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Yang, Y., Jiang, L.H., Luo, S.H. et al. Effect of Strain on Microstructure Evolution of 1Cr18Ni9Ti Stainless Steel During Adiabatic Shearing. J. of Materi Eng and Perform 25, 29–37 (2016). https://doi.org/10.1007/s11665-015-1776-7

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  • DOI: https://doi.org/10.1007/s11665-015-1776-7

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