Microstructure Evolution and Microhardness of Ultrafine-grained High Carbon Steel during Multiple Laser Shock Processing

Yi XIONG,,Tian-tian HE,Feng-zhang REN,,Peng-yan LI,Lu-fei CHEN,Alex A. VOLINSKY

Journal of Iron and Steel Research International ›› 2015, Vol. 22 ›› Issue (1) : 55-59.

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Journal of Iron and Steel Research International ›› 2015, Vol. 22 ›› Issue (1) : 55-59.
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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.

Key words

Ultrafine grained high carbon steel / laser shock processing / impact time / microstructure / microhardness

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XIONG YI. Microstructure Evolution and Microhardness of Ultrafine-grained High Carbon Steel during Multiple Laser Shock Processing[J]. Journal of Iron and Steel Research International, 2015, 22(1): 55-59

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