Improvement of hot forging tools with duplex treatment

Panjan, Peter; Urankar, I.; Navinšek, B.; Terčelj, Milan; Turk, R.; Čekada, Miha; Leskovšek, Vojteh

doi:10.1016/s0257-8972(01)01634-6

Cited by 52 publications

(29 citation statements)

References 8 publications

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“…Pant and Bleck (2005) could achieve an increase of 50%, which is less than that obtained in this study. In the study of Panjan et al (2002), nearly the same values were obtained compared to this study. The variations in the results obtained in different researches could be due to the nitriding parameters used (Pessin et al, 2000).…”

Section: Nitrided Diessupporting

confidence: 81%

“…Another study carried out by Panjan et al (2002) showed that the damage starts after 300 and 1100 forgings for heattreated dies and nitrided dies, respectively. They stated that no damage was observed with duplex treated dies, except the rounding of the dies.…”

Section: Toktek Coated Diesmentioning

confidence: 99%

“…The life of a hot working tool steel is affected by the wear behaviour of the tool steel (Sallit et al, 2002;Barrau et al, 2003;Bahrami et al, 2004), heat treatment applied to the die steel (Bahrami et al, 2004;Dobrzanski et al, 2004a;Lee et al, 2003), condition of the die surface (Sallit et al, 2002;Terčelj et al, 2006), the condition of the work metal at forging, the shape of the die cavity (Vieilledent and Fourment, 2001), the alignment of the upper and lower dies, the stress distribution on the die surface generated during each blow and surface treatments (Starling and Branco, 1997;Pellizzari et al, 2001;Navinsek et al, 2001a;Panjan et al, 2002;Dobrzanski et al, 2004b;Panjan et al, 2002) and weld overlay (Grenestedt, 2003;Tucker, 2004).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Cost and performance evaluation of different surface treated dies for hot forging process

Bayramoğlu

Polat²,

Geren

2008

Journal of Materials Processing Technology

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Section: Nitrided Diessupporting

confidence: 81%

Section: Toktek Coated Diesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cost and performance evaluation of different surface treated dies for hot forging process

Bayramoğlu

Polat²,

Geren

2008

Journal of Materials Processing Technology

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“…5 As in the case of punching tools, the best results are obtained through duplex technology, combining plasma nitriding of the tool-steel substrate and PVD or PACVD coating deposition. 57,58 However, besides the substrate hardness, a very important substrate property is its fracture toughness. 59 g' compound layer may act as an additional support interlayer, but its brittleness leads to a reduced coatingcracking resistance as soon as the substrate core hardness is reduced below 50 HRc.…”

Section: Hot Forgingmentioning

confidence: 99%

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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“…(8) Recentemente, a nitretação a plasma aplicada a aços ferramenta ganhou um novo impulso com o desenvolvimento do tratamento dúplex, que consiste na deposição de um revestimento duro (normalmente PVD -physical vapor deposition) sobre uma superfície previamente nitretada. (9)(10)(11)(12)(13)(14) A presença de uma camada de elevada dureza, abaixo do filme fino, tem demonstrado benefícios nas propriedades mecânicas da camada superficial. Bell et al (12) sugerem que a técnica dúplex apresenta uma melhor capacidade de sustentação de carga, maior resistência à fadiga e um perfil de dureza mais suave da superfície até…”

Section: Introductionunclassified

Estudo Do Perfil De Carbono Na Camada Nitretada Do Aço Aisi M2

Tier

Kieckow

Strohaecker

et al. 2007

TMM

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ResumoO principal objetivo deste trabalho é investigar a redistribuição do carbono que normalmente se observa após a nitretação a plasma de aços. Amostras do aço AISI M2 foram nitretadas em um reator a plasma com 60 kW, variando-se temperatura, tempo e composição do gás de tratamento. Foram realizadas análises de difração de raios X, espectroscopia de emissão óptica em descarga incandescente -GDOS e microscopia óptica e eletrônica de varredura. De acordo com as análises GDOS, as amostras nitretadas apresentaram descarbonetação na superfície da camada nitretada, e enriquecimento de carbono na região de interface da camada com o substrato. Para algumas condições de tratamento, foi observada a existência de um pequeno pico de carbono na interface entre a camada de compostos e a zona de difusão. Os resultados obtidos sugerem que a camada de compostos atue como uma barreira para a descarbonetação. Observa-se que, em amostras com camada de compostos bem definidas, o nível de descar bonetação foi baixo resultando em uma significativa precipitação de carbetos em contornos de grão. Palavras-chave: Nitretação a plasma; Camada nitretada; Descarbonetação. A STUDY OF CARBON PROFILE IN THE NITRIDED LAYER OF AISI M2 STEEL AbstractThe aim of this work is to investigate the redistribution of carbon normally observed after plasma nitriding of steels. Samples of AISI M2 steel were plasma nitrided in a 60 kW reactor varying temperature, time, and treatment gas composition. X-ray diffraction, glow discharge optical spectroscopy -GDOS, optical and scanning electron microscopy analysis were performed. According to GDOS analysis, the samples presented decarburization on the surface of the nitrided layer and a carbon enrichment zone in the interface layer-substrate. For some conditions of treatment, it was observed the presence of a small peak of carbon in the interface between the compound layer and the diffusion zone. The results suggest that the compound layer works as a barrier for the decarburization process. It was observed that for samples with a compact compound layer, the level of decarburization was low which resulted in a high level of carbides precipitation in the grain boundaries.

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Improvement of hot forging tools with duplex treatment

Cited by 52 publications

References 8 publications

Cost and performance evaluation of different surface treated dies for hot forging process

Cost and performance evaluation of different surface treated dies for hot forging process

Wear mechanisms and surface engineering of forming tools

Estudo Do Perfil De Carbono Na Camada Nitretada Do Aço Aisi M2

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