Wear resistance and anti-sticking properties of duplex treated forming tool steel

Podgornik, Bojan; Hogmark, Sture; Sandberg, Odd; Leskovšek, Vojteh

doi:10.1016/s0043-1648(03)00322-3

Cited by 63 publications

(29 citation statements)

References 15 publications

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“…3). In consequence, multilayered and multiple structures like those studied in this research can enhance the resistance of coatings against crack propagation in relation to the mechanical property evolution presented by the enhanced hardness and elastic modulus (see Table 2) with highest elastic recovery (see Table 4), preserving the integrity of the coatings under punctual and dynamic loads [27]. In this work, it was observed that an increase of 27% in the L c2 for HfN/VN multilayered systems with Λ = 15 nm and n = 80 is in relation to the multilayers with lowest bilayer number (n = 1).…”

Section: Tribological Propertiesmentioning

confidence: 86%

Design of hard surfaces with metal (Hf/V) nitride multinanolayers

Escobar

Caicedo

et al. 2014

J. Superhard Mater.

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Section: Tribological Propertiesmentioning

confidence: 86%

Design of hard surfaces with metal (Hf/V) nitride multinanolayers

Escobar

Caicedo

et al. 2014

J. Superhard Mater.

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“…This can be achieved by combining a thermochemical treatment of the substrate and hard-coating deposition, called a duplex treatment. 19,47 As shown in Figure 10a, by plasma nitriding the load-carrying capacity of the tool steel can be increased by up to three times. However, improper preparation of the substrate (the presence of a g' compound layer, a high roughness) or insufficient coating adhesion (TaC) will lead to immediate flaking of the coating (Figure 10b), regardless of the substrate's properties.…”

Section: Punching and Fine Blankingmentioning

confidence: 99%

“…Besides the complex geometry, which makes it difficult to obtain uniform coating deposition, commercial hard wear-resistant coatings show a relatively high coefficient of friction and a high tendency for galling against typical formed materials. [19][20][21] Typical tool steels also have a lower load-carrying capacity than high-speed steel, ceramics and hard metals. As such, tool steels do not provide sufficient support for very thin, hard and brittle coatings.…”

Section: Introductionmentioning

confidence: 99%

“…The improved load-carrying capacity of coated systems can be obtained by increasing the thickness of the coating, which is not easy to achieve due to the high residual stresses, by employing support layers, which increases costs, or through the most efficient duplex technique, combining a classic thermo-chemical treatment of the steel substrate and PVD or PACVD deposition of the protective coat ing. 19,23,24 Another option for improving the tribological properties, mainly the friction behaviour of the forming tools, either coated or un-coated, is through a surface-roughness and topography optimization. Proper selection and preparation of the surface topography, using techniques like polishing, shot-peening and laser surface texturing, can greatly improve the performance and galling resistance of the forming tools, and thus reduce or even eliminate the need for lubrication.…”

Section: Introductionmentioning

confidence: 99%

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Wear mechanisms and surface engineering of forming tools

Podgornik¹,

Leskovšek²

2015

Mater. Tehnol.

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The manufacturing of parts is faced with ever-increasing demands for higher strength (hardness) and toughness of the work material, as well as higher productivity and environmental concerns. At the same time, the quality requirements are high and will continue to grow in the future. This leads to restrictions in terms of the type and use of lubricants and especially to increased requirements relating to the wear and fatigue resistance of tools. The main focus on improving the wear resistance and tribological properties of forming tools has mainly been on developing tool steels with an improved fracture toughness and then modifying the lubricants for better retention and permeability at the tool/work-piece contact area. Nevertheless, the wear resistance of forming tools can also be successfully improved by surface-engineering techniques. In recent years, hard coatings in particular have shown enormous potential for improving the tribological properties of contact surfaces. This paper reviews the wear mechanisms encountered in forming processes, as well as various surface-engineering techniques designed to improve the wear resistance and the anti-sticking properties of forming tools. The possible benefits and restrictions of different surface-engineering techniques are presented for the example of sheet-metal forming, fine blanking and forging. Keywords: surface engineering, forming, hard coatings, topography, friction, wear Preoblikovalna industrija se spopada z nenehno nara{~ajo~imi zahtevami po vi{ji trdnosti (trdoti) in`ilavosti preoblikovanih materialov, kakor tudi ve~ji produktivnosti in skrbi za okolje. Isto~asno se pove~ujejo zahteve po kvaliteti izdelkov, kjer predvsem kvaliteta povr{ine postaja vedno bolj pomembna. To pomeni omejitve pri uporabi maziv ter seveda ve~je zahteve po obrabni odpornosti in vzdr`ljivosti preoblikovalnih orodij. Do nedavnega je izbolj{evanje obrabne obstojnosti in tribolo{kih lastnosti preoblikovalnih orodij temeljilo predvsem na razvoju bolj`ilavih in~istej{ih orodnih jekel ter modifikaciji maziv z bolj{imi mazalnimi lastnostmi. V zadnjih letih pa tudi na podro~ju preoblikovalnih orodij tehnike in`eniringa povr{in, {e posebej nanos trdih za{~itnih prevlek, omogo~ajo nadaljnje izbolj{anje tribolo{kih lastnosti kontaktnih povr{in. V prispevku so tako predstavljeni obrabni mehanizmi, ki so jim izpostavljena preoblikovalna orodja, kakor tudi razli~ne tehnike in`eniringa povr{ine, namenjene izbolj{anju obrabne obstojnosti in tornih lastnosti preoblikovalnih orodij. Problemi in prednosti uporabe in`eniringa povr{ine so poudarjene na primeru hladnega preoblikovanja plo~evine, {tancanja in kovanja.

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“…In a study on wear behavior of H11 tool steel, Barau et al [2] concluded that the main reason of metal surface destruction under 500 • C is oxidizing wear. Podgornik et al [3] improved the wear resistance of tool steel using plasma nitriding. Elsaran et al [4] observed that the friction coefficient was 0.5 and the wear resistance increased with the aging of nitrided 4140 steel for 0.5 h. An approach to enhancing the surface characterization of steels is coating by different methods.…”

Section: Introductionmentioning

confidence: 99%

Surface Characterization and Corrosion Resistance of 36Cr-Ni-Mo4 Steel Coated by WC-Co Cermet Electrode Using Micro-Electro Welding

Azhideh

Aghajani

Pourbagheri

2017

Metals

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Abstract:In this paper the influence of spark energy on corrosion resistance, hardness, surface roughness and morphology of WC-Co coated 36Cr-Ni-Mo4 steel by Micro-Electro Welding (MEW) was investigated. Frequencies of 5, 8 and 11 kHz, currents of 15, 25 and 35 A and duty cycles of 10, 30 and 50 % were applied for coating of the samples using a WC-Co cermet electrode. The results indicate that increasing the current, Duty cycle and frequency of the process increases spark energy. As spark energy increases, efficiency of coating increases to 80% and then decreases. X-ray diffraction (XRD) analysis was used to identify the phases. The results indicated that other than the peaks obtained for the metallic Iron with BCC (Body Centered Cubic) structure, Tungsten Carbide, Cr 7 C 3 and Titanium Carbide phases were also seen on the surface. Vickers micro hardness method was used for hardness measurement of the samples. Surface hardness increases to 817.33 HV0.05 with spark energy increasing up to 1.03 mJ, and then reducing. Optical Microscopy (OM) and scanning electron microscopy (SEM) to study Microstructural and atomic force microscopy (AFM) to study the topography, morphology and roughness were used. Polarization technique in 3.5 wt % NaCl solution was used to evaluate the corrosion properties. The results of the energy dispersive X-ray spectroscopy (EDS) analysis indicate that with increasing spark energy, the amount of Tungsten in surface increases to 41.95 wt % and then decreases. As spark energy increases up to 2.17 mJ, thickness of coating increases to 8.31 µm and then decreases. As spark energy increases, surface roughness is also increased. Corrosion test results indicated that the lowest corrosion rate (2.6 × 10 −8 mpy) is related to the sample with the highest level of efficiency.

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Wear resistance and anti-sticking properties of duplex treated forming tool steel

Cited by 63 publications

References 15 publications

Design of hard surfaces with metal (Hf/V) nitride multinanolayers

Design of hard surfaces with metal (Hf/V) nitride multinanolayers

Wear mechanisms and surface engineering of forming tools

Surface Characterization and Corrosion Resistance of 36Cr-Ni-Mo4 Steel Coated by WC-Co Cermet Electrode Using Micro-Electro Welding

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