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Microstructure Refinement and Property Improvement of Metastable Austenitic Manganese Steel Induced by Electropulsing

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Abstract

Grain refinement eficiency of electropulsing treatment (EPT) for metastable austenitic manganese steel was investigated. The mean grain size of original austenite is 300μm. However, after EPT, the microstructure exhibits a bimodal grain size distribution, and nearly 70vol. % grains are less than 60μm. The refined austenite results in ultrafine martensitic microstructure. The tensile strengths of refined austenitic and martensitic microstructures were improved from 495 to 670, and 794 to 900 MPa respectively. The fine grained materials possess beter fracture toughness. The workGhardening capacity and wear resistance of the refined austenitic microstructure are improved. The reasonable mechanism of grain refinement is the combination of accelerating new phase nucleation and restraiG ning the growth of neonatal austenitic grain during reverse transformation and rapid recrystalization induced by electropulsing.

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Authors and Affiliations

  1. Key Laboratory of Automobile Materials of Ministry of Education, Department of Materials Science and Engineering, Jilin University, Changchun, Jilin, 130022, China

    Yu-guang Zhao (Doctor, Professor), Jia-tao Zhang, Juan Tan & Bing-dong Ma

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  1. Yu-guang Zhao
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  2. Jia-tao Zhang
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  3. Juan Tan
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  4. Bing-dong Ma
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Correspondence to Yu-guang Zhao.

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Foundation Item: Item Sponsored by National Natural Science Foundation of China (51071075)

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Zhao, Yg., Zhang, Jt., Tan, J. et al. Microstructure Refinement and Property Improvement of Metastable Austenitic Manganese Steel Induced by Electropulsing. J. Iron Steel Res. Int. 21, 685–689 (2014). https://doi.org/10.1016/S1006-706X(14)60106-0

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  • DOI: https://doi.org/10.1016/S1006-706X(14)60106-0

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