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A New Strategy for Restraining Dynamic Strain Aging in GH4169 Alloy During Tensile Deformation at High Temperature

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

The dynamic strain aging (DSA) behavior was investigated in GH4169 alloy during tensile deforming with electric-pulse current (EPC) at 750 °C. The results show that DSA is restrained in the alloy when deformed with 40 Hz-EPC. The size of γ″ phase inner grains increases obviously and δ phase is facilitated to precipitate on grain boundary in the alloy applied with EPC, due to the promotion effect of EPC on the diffusion and segregation of atoms. Transmission electron microscopy (TEM) results indicate that dislocations can cut through small γ″ precipitate with the size of less than 10 nm, while dislocations can only bypass dislocations when γ″ precipitate grow up over 20 nm. The growth of precipitates consumes large amounts of atoms as well as the velocity of dislocation increase, which makes dislocations difficult to be pinned. Therefore, when γ″ precipitates grow up to a large size more than the critical size of dislocation pinning, DSA is significantly restrained in the alloy after necking deformed with EPC.

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Acknowledgements

This work was financially supported by the Open Project of State Key Laboratory of Advanced Special Steel, Shanghai Key Laboratory of Advanced Ferrometallurgy, the Shanghai University and the Science and Technology Commission of Shanghai Municipality (No. 19DZ2270200) and the Open fund of Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process (No. SHSYS202003).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Shanghai University, Shanghai, 200444, China

    Xin-Tong Lian & Han Dong

  2. Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process, Shenyang Aerospace University, Shenyang, 110136, China

    Jin-Lan An

  3. Key Lab for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, Shenyang, 110819, China

    Lei Wang

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  1. Xin-Tong Lian
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  2. Jin-Lan An
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Correspondence to Jin-Lan An.

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Lian, XT., An, JL., Wang, L. et al. A New Strategy for Restraining Dynamic Strain Aging in GH4169 Alloy During Tensile Deformation at High Temperature. Acta Metall. Sin. (Engl. Lett.) 35, 1895–1902 (2022). https://doi.org/10.1007/s40195-022-01398-3

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  • DOI: https://doi.org/10.1007/s40195-022-01398-3

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