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Microstructure evolution and microhardness of ultrafine-grained high carbon steel during multiple laser shock processing

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Abstract

Surface microstructure and microhardness of (ferrite+cementite) microduplex structure of the ultrafine-grained high carbon steel after laser shock processing (LSP) with different impact times were investigated by means of scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and microhardness measurements. Equiaxed ferrite grains were refined from 400 to 150 nm, and the cementite lamellae were fully spheroidized, with a decrease of the particle diameter from 150 to 100 nm as the impact times increased. The cementite dissolution was enhanced significantly. Correspondingly, the lattice parameter of α-Fe and microhardness increased with the impact times.

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Foundation Item: Item Sponsored by National Natural Science Foundation of China (50801021, 51201061); Program for Young Key Teachers in Henan Province of China (2011GGJS-070); Program for Henan Province for Science and Technology Innovation Excellent Talents of China (144200510001)

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Xiong, Y., He, Tt., Ren, Fz. et al. Microstructure evolution and microhardness of ultrafine-grained high carbon steel during multiple laser shock processing. J. Iron Steel Res. Int. 22, 55–59 (2015). https://doi.org/10.1016/S1006-706X(15)60009-7

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  • DOI: https://doi.org/10.1016/S1006-706X(15)60009-7

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