Surface Residual Stress and Friction Wear Behavior of Vermicular Graphite Cast Iron after Laser Remelting

Song, Jiaxing; Zheng, Buyun; Tang, Yisen; Li, Zhengyang; Lei, Jianbo

doi:10.1007/s11665-023-09128-1

Cited by 1 publication

(1 citation statement)

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“…An approach to increase the hardness of GJS is laser heat treatment [7,8] or laser remelting [5,[9][10][11][12][13]. The laser remelting of metals involves the remelting of a thin surface layer, typically ranging from 1 to 100 µm, using laser radiation.…”

Section: Introductionmentioning

confidence: 99%

Laser Remelting of Ductile Cast Iron to Achieve a Graphite-Free Surface Layer for Enabling a Manual High-Gloss Finish

Kreinest,

Schüssler,

Özaydin

et al. 2024

Metals

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Laser remelting is being explored as a viable technique for obtaining a graphite-free, defect-free surface layer on cast iron EN GJS 400-15. The goal is to obtain a large remelted layer along with a low surface roughness to enable a subsequent manual high-gloss surface finish. The impact of the laser remelting process parameters is evaluated by using samples with three different cooling rates, resulting in different graphite microstructures. By utilizing four passes and a laser power of 300 W, the smallest roughness and largest remelting depth are achieved. The remelted layer is mostly devoid of graphite particles. Subsequent manual polishing is performed to evaluate the potential for achieving a high-gloss finish with a roughness of Sa < 0.05 µm. Laser remelting alone does not improve visual appearance or reduce roughness. However, after manual polishing, the roughness of the laser-remelted surfaces with Sa = 0.018 µm is one order of magnitude smaller than the manually polished initial state. Graphite removal during laser remelting therefore makes it possible to achieve a conventional and high-gloss polish, overcoming the previous limitations of GJS materials.

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