Surface modification of AISI H13 tool steel with silicon or manganese powders mixed to the dielectric in electrical discharge machining process

Molinetti, Anderson; Amorim, Fred L.; Soares, Paulo; Czelusniak, Tiago

doi:10.1007/s00170-015-7613-1

Cited by 40 publications

(17 citation statements)

References 15 publications

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“…Addition of silicon powder to the EDM has been shown to yield an improved surface finish compared to a clean discharge gap [27]. In the case of silicon powder, this effect has been shown to yield a surface roughness reduction of 80% compared to the use of manganese powder which yielded only a 50% reduction [28]. Additionally, in the latter work, the recast layer produced was absent of pores and cracks in the case of use of silicon powder, as opposed to a recast layer still characterised by some level of pores and cracks in the case of manganese powder, under identical parameters.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…hence overall coating morphology in the case of pure Si and TiC/Si coatings. To explain the difference in gap width and hence crater morphology for TiC and Si sacrificial electrodes, lower density and hence higher buoyancy of Si in comparison TiC means a higher uniformity of polarisable electrically conductive particles assist in dielectric breakdown, thereby increasing gap width [28]. To summarise the mechanisms which result in improved layer properties in TiC/Si based composite coatings, a schematic is shown in Figure 11.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

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Defect-free TiC/Si multi-layer electrical discharge coatings

Murray

Cook²,

Senin

et al. 2018

Materials & Design

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The process of electrical discharge coating (EDC) may be used to deposit hard materials on conformal substrate surfaces. Next generation EDM'd components may exploit attachment phenomena to enhance recast layer properties, to avoid the need for recast layer removal. Here, a ceramic based composite layer was developed without cracking and porosity for the first time, using sequential coating using sacrificial TiC and Si electrodes. Attenuation of the discharge process by gap widening using Si debris in the gap explained improved layer properties. Composite coatings combining WC and TiC were also demonstrated, with good elemental intermixing. Attachment level was correlated strongly with melting point, with high melting point materials resisting ejection due to more rapid solidification. Nanoindentation showed the TiC and WC/TiC layers possessed the highest mean hardness

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Section: Accepted Manuscriptmentioning

confidence: 99%

Section: Accepted Manuscriptmentioning

confidence: 99%

Defect-free TiC/Si multi-layer electrical discharge coatings

Murray

Cook²,

Senin

et al. 2018

Materials & Design

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“…EDM is capable of making complex shapes and deep cavities; the only requirement is to work with an electrically conductive material. The necessary conditions to take into account in the EDM process that can affect the EDM removal rates and surface finishing of dies are the following: the material of the electrodes [14], the frequency of pulses and depths [15] and the addition of external powders [16] to modify surface properties and minimize the roughness by filling pores and cracks. Once the dies are manufactured, different surface treatments are used to extend their service life [17]; the most used treatment is the diffusion of nitrogen (nitriding), which achieves a significant increase of surface hardness and increase up to 125% in fatigue life [18].…”

Section: Introductionmentioning

confidence: 99%

Surface Damaging of Brass and Steel Pins when Sliding over Nitrided Samples Cut by Finishing and Roughing EDM Conditions

et al. 2020

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In the forging industry, surface quality and surface treatments of dies are crucial parameters to extend their life. These components are usually machined by milling or by Electrical Discharge Machining (EDM), and the final surface roughness depends on the machining techniques and operational conditions used in its fabrication. After milling, a nitriding treatment is widely applied to extend its service life. Nevertheless, no scientific report that informs about nitriding after EDM has been found. Accordingly, this work focuses on the wear and friction behavior of pins made of brass and medium carbon steel sliding over AISI H13 discs, made by wire EDM in the conditions of finishing and roughing. The discs are plasma nitride, and their effect on the wear during pin-on-disc tests is evaluated. In this sense, the analysis of the surface damage for the different pins will help us to understand the service life and wear evolution of the forging dies. The results show that plasma nitride reduces the friction and prevents the degradation of the pin, independently of the material of the pin, when sliding over finishing and roughing EDM conditions.

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“…Keywords: QPQ treatment, H13 steel, Wear resistance, Hardness, Microstructure 1 Introduction H13 steel is a kind of widely used hot die steel due to its good mechanical properties at elevated temperature and moderate cost [1][2][3]. In real application, hot working tools are generally repeatedly subjected to high temperature and heavy loads [4,5], these severe conditions tend to result in failure of the tools due to wear or plastic deformation etc.…”

Section: Introductionmentioning

confidence: 99%

“…The maximum surface hardness value of 1441 HV0.3was obtained after nitriding at 565℃ for 150 min, which is as three times high as that of untreated sample. Meanwhile the wear resistance of H13 steel is significantly improved by QPQ treatment, 150 min is the optimum nitriding time to improve the surface hardness and wear resistance of H13 steel.Keywords: QPQ treatment, H13 steel, Wear resistance, Hardness, Microstructure 1 Introduction H13 steel is a kind of widely used hot die steel due to its good mechanical properties at elevated temperature and moderate cost [1][2][3]. In real application, hot working tools are generally repeatedly subjected to high temperature and heavy loads [4,5], these severe conditions tend to result in failure of the tools due to wear or plastic deformation etc.…”

mentioning

confidence: 99%

Effect of QPQ Treatment on the Performance for H13 Die Steel

Meng²,

Cai

et al. 2017

Acta Metall Slovaca

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QPQ salt bath treatment of H13 steel was conducted by nitriding at the same temperature of 565 ℃ for various times, followed by the same post-oxidation process. Optical microscope, microhardness tester, X-ray diffraction and wear resistance tester were employed to characterize the microstructure, phase constituents, micro-hardness and wear resistance of the treated specimens. The results showed a compound layer mainly composed of ε-Fe2-3N and diffusion layer were formed during salt bath nitriding and a thin oxide layer composed of Fe3O4 was formed by postoxidation, and the compound layer thickness increases with the nitriding time. The maximum surface hardness value of 1441 HV0.3was obtained after nitriding at 565℃ for 150 min, which is as three times high as that of untreated sample. Meanwhile the wear resistance of H13 steel is significantly improved by QPQ treatment, 150 min is the optimum nitriding time to improve the surface hardness and wear resistance of H13 steel.Keywords: QPQ treatment, H13 steel, Wear resistance, Hardness, Microstructure 1 Introduction H13 steel is a kind of widely used hot die steel due to its good mechanical properties at elevated temperature and moderate cost [1][2][3]. In real application, hot working tools are generally repeatedly subjected to high temperature and heavy loads [4,5], these severe conditions tend to result in failure of the tools due to wear or plastic deformation etc. [6][7][8][9][10][11][12]. In order to improve the related properties of H13 die steel, researchers have tried various surface modification methods, such as plasma nitriding, ion implantation, laser surface treatment and carbonitriding [13][14][15][16][17], among these technologies, plasma nitriding is currently widely adopted in real application to improve the wear resistance [18][19][20]. Unfortunately, it generally takes dozens of hours to obtain the required properties, which brings out low efficiency and high consumption of energy [21,22]. It has been reported that QPQ treatment is an effective surface modification technology, which has been widely used in manufacturing field to improve the wear and corrosion resistance of the components [23,24], since a compact oxide film can be formed on the top of a nitriding layer on the metal surface after QPQ treatment. More importantly, comparing with plasma nitriding, QPQ treatment has significant advantage of much higher efficiency; it generally takes only several hours for the whole process.

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Surface modification of AISI H13 tool steel with silicon or manganese powders mixed to the dielectric in electrical discharge machining process

Cited by 40 publications

References 15 publications

Defect-free TiC/Si multi-layer electrical discharge coatings

Defect-free TiC/Si multi-layer electrical discharge coatings

Surface Damaging of Brass and Steel Pins when Sliding over Nitrided Samples Cut by Finishing and Roughing EDM Conditions

Effect of QPQ Treatment on the Performance for H13 Die Steel

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