Gradient Nanotwinned Structure and Its Formation Mechanism in Inconel 625 Alloy Produced by Surface Mechanical Grinding Treatment

Yuanjun Ma; Yutian Ding; Yubi Gao; Jianjun Chen; Xingmao Wang

doi:10.1007/s12540-022-01297-3

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자료유형: 학술저널

저자정보: Yuanjun Ma (Lanzhou University of Technology) Yutian Ding (Lanzhou University of Technology) Yubi Gao (Lanzhou University of Technology) Jianjun Chen (Lanzhou University of Technology) Xingmao Wang (Lanzhou University of Technology)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.29 No.5

발행연도: 2023.5

수록면: 1,454 - 1,468 (15page)

DOI: 10.1007/s12540-022-01297-3

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Effects of surface mechanical grinding treatment on the structure evolution and grain refinements of gradient structured surfacelayer on Inconel 625 have been studied. The results showed that a 600 μm thick gradient nanotwinned (GNT) structurelayer could be successfully constructed in the superficial layer of the alloy by adjusting the process parameters. The TEMcharacterization revealed that a gradient change from nano-grain and nanotwinned to dislocation structure was formed inthe alloy structure, and the grain size of the outermost layer of the alloy could be refined to 18 nm, with a thickness of up to30 μm and a surface hardness of 7.4 GPa. In addition, with an increase in the layer depth, twinning played a major role in therefinement. Firstly, a high-density twin/matrix lamellar structure was formed in the microstructure at high strain rates duringthe process of plastic-induced grain refinement, and the original coarse grains were refined. During further deformation,due to the increasing difficulty of work hardening and the reactions between dislocations and twin boundaries, the lamellarstructure was sheared and broken into equiaxed nanocrystals. Finally, the nanocrystals were further refined to a smallersize through twinning. During this process, twinning is more likely to occur for a grain size of 71–80 nm. These findingsshed light on the basic principle of GNT construction, especially the twinning induced grain refinement mechanism underdifferent grain sizes.

#Inconel 625 alloy · Surface mechanical grinding treatment · Gradient nanotwinned structure · Grain refinement

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