Surface modification of ductile iron produced by an innovative in-situ casting technique

Mardaras, Enara; González-Martínez, R.; Bayón, R.; Nastac, Laurentiu; Méndez, Susana

doi:10.1080/13640461.2020.1766278

Cited by 7 publications

(7 citation statements)

References 20 publications

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“…The layers showed dendrite formation and microconstituents typically found in white cast iron due to the carbon enrichment of the weld pool [54,55]. Such microconstituents consist of transformed ledeburite, composed of iron carbide plates and pearlite islands.…”

Section: Metallographic and Sem Characterization Of Final Layers Prod...mentioning

confidence: 96%

“…Figure 11 shows SEM images of microconstituents present in a layer over the pearlitic matrix substrate, but the same are also present in the layers produced in all other conditions. The layers showed dendrite formation and microconstituents typically found in white cast iron due to the carbon enrichment of the weld pool [54,55]. Such microconstituents consist of transformed ledeburite, composed of iron carbide plates and pearlite islands.…”

Section: Metallographic and Sem Characterization Of Final Layers Prod...mentioning

confidence: 96%

“…Figure 12 shows the layers produced in specimens preheated to 300 • C for 1 h, cooled in oil after melting, and treated with PWHT at 300 • C for 2 h. The layers showed dendrite formation and microconstituents typically found in white cast iron due to the carbon enrichment of the weld pool [54,55]. Such microconstituents consist of transformed ledeburite, composed of iron carbide plates and pearlite islands.…”

Section: Effects Of Pwht Treatments On Layersmentioning

confidence: 99%

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In-Situ Production of Metal Matrix Composites Layers by TIG Surface Alloying to Improve Wear Resistance of Ductile Cast Iron Using a Buffer-Layer and Post Weld Heat Treatment

et al. 2023

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A TIG surface alloying process was applied to modify the surface of ductile cast iron samples. Using this process, in-situ metal matrix composite (MMC) layers were produced on samples to improve their wear resistance. These layers were made by melting substrates and powders as additional material into this melt pool. The efficiency of preheating of the samples to prevent cold cracks during solidification was verified. Moreover, a buffer layer produced in situ to decrease the mismatches between the chemical and physical properties of the materials was also tested. Post-weld heat treatment (PWHT) was used to increase the tribological characteristics of the layers and eliminate adverse effects of the heat-affected zone (HAZ) created by the fusion of the substrate surface. The results showed that, in the samples without preheating, the formation of cold cracks occurred. Additionally, layers produced without a buffer layer showed defects, such as shrinkage and porosity. However, using both preheating and a buffer layer prevented cold cracks, discontinuities, shrinkage, and porosity defects in the layers. Furthermore, PWHT allowed for the transformation of brittle martensite into tempered martensite at the HAZ. MMC layers presented high hardness of up to 1230 HV and wear resistance up to 5.8 times greater compared to the substrate samples without layers.

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Section: Metallographic and Sem Characterization Of Final Layers Prod...mentioning

confidence: 96%

Section: Metallographic and Sem Characterization Of Final Layers Prod...mentioning

confidence: 96%

Section: Effects Of Pwht Treatments On Layersmentioning

confidence: 99%

See 1 more Smart Citation

In-Situ Production of Metal Matrix Composites Layers by TIG Surface Alloying to Improve Wear Resistance of Ductile Cast Iron Using a Buffer-Layer and Post Weld Heat Treatment

et al. 2023

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“…Studies were found on investigating various methods of enhancing the properties of ductile iron, including corrosion and wear resistance, high temperature performance, fatigue strength, and reducing internal porosity. Various works have focused on modifying the microstructure through alloying additions, heat treatment, and controlling casting parameters [5][6][7][8][9].…”

Section: Figmentioning

confidence: 99%

Certain investigation on feasibility of developing riser less ductile iron castings

Subramanian,

Palanisamy,

Raman

et al. 2024

E3S Web Conf.

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The solidification mechanism of ductile iron is a bit complex due to the precipitation of graphite and silicon. These elements change the solidification pattern of cast iron. Density of these elements is less than iron leads to occupying more volume consequently increase the overall metal volume. There are two aspects on this increase in metal volume. One is, reducing this volume increase to reduce the creation of porosities at the earlier stage of solidification and second is, using this volume increase to remove porosity at the later stage of solidification. Proper understanding of this graphite expansion in cast iron solidification will bring insights on reducing or removing of the risers. The current study focus on correlating the net contraction and austenitic liquidus point with shrinkage. The average contraction found through this study is 1.36 % which is more than the net expansion of 0.25 % (without riser) reported in literature. The study found that properly balancing graphite precipitation, pouring temperature and mold strength can enable riserless casting of ductile iron by compensating for liquid contraction through graphite expansion.

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“…For this purpose, surface engineering technologies are used to improve the wear resistance of the surface, while maintaining the beneficial mechanical and plastic properties of the ductile cast iron core. For these alloys, laser surface treatment technologies are commonly used [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

The Laser Alloying Process of Ductile Cast Iron Surface with Titanium Powder in Nitrogen Atmosphere

et al. 2022

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The article presents the results of the laser alloying process of a ductile cast iron EN-GJS 350-22 surface with titanium powder in nitrogen atmosphere. The aim of this research was to test the influence of nitrogen atmosphere on the structure and properties of the ductile cast iron surface layer produced by a laser alloying process with titanium. The laser alloying process was conducted using a Rofin Sinar DL020 2 kW high-power diode laser (HPDDL) with rectangular focus and uniform power density distribution in the focus axis. The tests of the produced surface layers included macrostructure and microstructure observations, X-ray diffraction (XRD) analysis, energy-dispersive spectroscopy (EDS) on scanning electron microscope (SEM) and transmission electron microscope (TEM), Vickers hardness and solid particle erosion according to ASTM G76-04 standard. As a result of the laser alloying process in nitrogen atmosphere with titanium powder, the in situ metal matrix composite structure reinforced by TiCN particles was formed. The laser alloying process of ductile cast iron caused the increased hardness and erosion resistance of the surface.

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Surface modification of ductile iron produced by an innovative in-situ casting technique

Cited by 7 publications

References 20 publications

In-Situ Production of Metal Matrix Composites Layers by TIG Surface Alloying to Improve Wear Resistance of Ductile Cast Iron Using a Buffer-Layer and Post Weld Heat Treatment

In-Situ Production of Metal Matrix Composites Layers by TIG Surface Alloying to Improve Wear Resistance of Ductile Cast Iron Using a Buffer-Layer and Post Weld Heat Treatment

Certain investigation on feasibility of developing riser less ductile iron castings

The Laser Alloying Process of Ductile Cast Iron Surface with Titanium Powder in Nitrogen Atmosphere

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