A Thermo-metallurgical Model for Laser Surface Engineering Treatment of Nodular Cast Iron

Boccardo, Adrián Dante; Catalán, Néstor; Celentano, Diego J.; Ramos-Moore, E.

doi:10.1007/s11663-021-02058-0

Cited by 3 publications

(1 citation statement)

References 23 publications

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“…Under the influence of high-energy laser beams, the thickness of the film layer shows a standard periodic change from the lap joint to the crescent top [18]. The heat-affected fine-grained zone shows an acicular martensite structure consistent with the structure state after the laser heat treatment [19]. This proves that the substrate absorbs the energy of the laser beam after the prefabricated activated film and the process of prefabricating the activation film dramatically improves the laser absorption rate of the polished surface of the nodular cast iron.…”

Section: Micromorphologymentioning

confidence: 86%

Laser Melting of Prefabrication AlOOH-Activated Film on the Surface of Nodular Cast Iron and Its Associated Properties

Zhang,

Yin,

Liu

et al. 2023

Materials

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This study aimed to improve the absorption rate of laser energy on the surface of nodular cast iron and further improve its thermal stability and wear resistance. After a 0.3 mm thick AlOOH activation film was pre-sprayed onto the polished surface of the nodular cast iron, a GWLASER 6 kw fiber laser cladding system was used to prepare a mixed dense oxide layer mainly composed of Al2O3, Fe3O4, and SiO2 using the optimal laser melting parameters of 470 W (laser power) and 5.5 mm/s (scanning speed). By comparing and characterizing the prefabricated laser-melted surface, the laser-remelted surface with the same parameters, and the substrate surface, it was found that there was little difference in the structure, composition, and performance between the laser-remelted surface and the substrate surface except for the morphology. The morphology, structure, and performance of the laser-melted surface underwent significant changes, with a stable surface line roughness of 0.9 μm and a 300–400 μm deep heat-affected zone. It could undergo two 1100 °C thermal shock cycles; its average microhardness increased by more than one compared to the remelted and substrate surfaces of 300 HV, with a maximum hardness of 900 HV; and the average friction coefficient and wear quantity decreased to 0.4370 and 0.001 g, respectively. The prefabricated activated film layer greatly improved the thermal stability and wear resistance of the nodular cast iron surface while reducing the laser melting power.

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Section: Micromorphologymentioning

confidence: 86%

Laser Melting of Prefabrication AlOOH-Activated Film on the Surface of Nodular Cast Iron and Its Associated Properties

Zhang,

Yin,

Liu

et al. 2023

Materials

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Influence of tempering conditions on the microstructure and mechanical properties of nodular cast iron

Singh

Agarwal

2022

Australian Journal of Mechanical Engineering

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Surface Laser Treatment of Cast Irons: A Review

Catalán

Ramos-Moore

Boccardo

et al. 2022

Metals

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Heat treatments are frequently used to modify the microstructure and mechanical properties of materials according to the requirements of their applications. Laser surface treatment (LST) has become a relevant technique due to the high control of the parameters and localization involved in surface modification. It allows for the rapid transformation of the microstructure near the surface, resulting in minimal distortion of the workpiece bulk. LST encompasses, in turn, laser surface melting and laser surface hardening techniques. Many of the works devoted to studying the effects of LST in cast iron are diverse and spread in several scientific communities. This work aims to review the main experimental aspects involved in the LST treatment of four cast-iron groups: gray (lamellar) cast iron, pearlitic ductile (nodular) iron, austempered ductile iron, and ferritic ductile iron. The effects of key experimental parameters, such as laser power, scanning velocity, and interaction time, on the microstructure, composition, hardness, and wear are presented, discussed, and overviewed. Finally, we highlight the main scientific and technological challenges regarding LST applied to cast irons.

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A Thermo-metallurgical Model for Laser Surface Engineering Treatment of Nodular Cast Iron

Cited by 3 publications

References 23 publications

Laser Melting of Prefabrication AlOOH-Activated Film on the Surface of Nodular Cast Iron and Its Associated Properties

Laser Melting of Prefabrication AlOOH-Activated Film on the Surface of Nodular Cast Iron and Its Associated Properties

Influence of tempering conditions on the microstructure and mechanical properties of nodular cast iron

Surface Laser Treatment of Cast Irons: A Review

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