Improvement of hot-working processes with PVD coatings and duplex treatment

Navinšek, B.; Panjan, Peter; Urankar, I.; Cvahte, Peter; Gorenjak, Frank

doi:10.1016/s0257-8972(01)01098-2

Cited by 65 publications

(38 citation statements)

References 8 publications

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“…The use of PVD hard coatings such as TiN, CrN and TiAlN, in order to improve the lifetime of mechanical parts is a well-known approach. Hard coatings can protect the steel surface very efficiently from physicochemical attacks and delay the formation and propagation of thermal and mechanical cracks [1]. In recent years, chromium aluminum nitride (CrAlN), a ternary nitride obtained by incorporating Al into transition binary CrN thin coatings, has been intensively investigated [2][3][4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Correlation between thermal properties and aluminum fractions in CrAlN layers deposited by PVD technique

Tlili

Nasri²,

Nouveau

et al. 2010

Vacuum

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. The CrAlN coatings are a good alternative to conventional CrN coatings especially for high temperature oxidation-resistance applications. Different CrAlN coatings were deposited on silicon (100) by PVD (Physical vapor deposition) technique from two targets (chromium and aluminum) in a reactive nitrogen atmosphere at aluminum applied negative voltage (À300, À500, À700 and À900 V). The composition, structural, mechanical and thermal properties of the as-deposited coatings were systematically characterized by energy dispersive analysis of X-rays, X-ray diffraction, nanoindentation, and the ''Mirage effect'' experiments. The X-ray diffraction (XRD) data show that in general CrAlN coatings were crystallized in the cubic NaCl B1 structure, with the (1 1 1) and (2 0 0) diffraction peaks observed. Two-dimensional surface morphologies of CrAlN coatings were investigated by atomic force microscope (AFM). The results show that with increasing aluminum proportion the coatings became more compact and denser and their increased correspondingly, showing a maximum hardness of about 36 GPa (30 at% of Al) which is higher than that of CrN. Moreover, the results in this work demonstrate that the variation of aluminum fraction alter the resulting columnar grain morphology and porosity of the coatings. However, the thermal properties are greatly affected by these morphological alterations. The correlation between aluminum fraction in CrAlN coatings and its thermal properties revealed that the conductivity and the diffusivity are influenced primarily by size and shape distribution of the pores and secondarily by a decrease of the stitch parameter dimension.

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Section: Introductionmentioning

confidence: 99%

Correlation between thermal properties and aluminum fractions in CrAlN layers deposited by PVD technique

Tlili

Nasri²,

Nouveau

et al. 2010

Vacuum

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“…An optimal processing temperature is about 500 to 540°C [8]. There are trials using duplex layers in the sequence: nitriding plus PVD or CVD or PACVD [9,10]. Due to economic reasons, these technologies are seldomly applied.…”

Section: Typical Repair Methods Applied To Worn Forging Diesmentioning

confidence: 99%

Damage, Lifetime, and Repair of Forging Dies

Buchmayr

2016

Berg Huettenmaenn Monatsh

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Abstract:The life time of forging dies is essential for economic production. The forging conditions and the characteristic tool damage vary from part to part, which makes a life time prediction very difficult. By means of three case studies, it is shown that the knowledge of the dominant damage mechanism is the key to finding out proper counter-measures or repair technologies. Best practice processing and repair technologies are discussed in this paper. Common tool materials are listed and assigned to their proper usage. Plasma-nitriding without white layer is proposed to be a good economic and technical compromise, when compared to other surface technologies. Finally, the potential of automatic tooling for die repair is pointed out.

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“…13) Nowadays, the different surface treatments are related to the improvement of tool steel wear resistance in harsh environments characteristic of the manufacturing process. 4,5) The die casting process uses high pressure to inject high temperature molten alloy into a die cavity. During filling, solidification and the die holding stages, the molten aluminum attacks the die steel surface.…”

Section: Introductionmentioning

confidence: 99%

Effects of Thermal Erosion and Wear Resistance on AISI H13 Tool Steel by Various Surface Treatments

Chang

Huang²,

Wang

2012

Mater. Trans.

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In this study AISI H13 steel was treated with oxynitriding, CrN coating, and CrN coated with oxynitriding to investigate the molten loss for melting A380 aluminum alloy and wear resistance. The experimental results indicate that the minimum melting loss appeared in duplex surface treatments of CrN coated with oxynitriding after a 3 h erosive test. Weight loss was only 0.8%; however the untreated specimen was 3.2%. In addition, all specimens following the different surface treatments, showed a higher wear resistance after the wear test. The untreated specimen showed obvious traces of plough cracks. Conversely, other surface treated specimens experienced very shallow wear. This result shows that the wear resistance of AISI H13 can be effectively improved by performing various surface treatments. The lowest coefficient of friction also appeared in the duplex surface treatment of CrN coated with oxynitriding. The average value of frictional coefficient was 0.28.

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Improvement of hot-working processes with PVD coatings and duplex treatment

Cited by 65 publications

References 8 publications

Correlation between thermal properties and aluminum fractions in CrAlN layers deposited by PVD technique

Correlation between thermal properties and aluminum fractions in CrAlN layers deposited by PVD technique

Damage, Lifetime, and Repair of Forging Dies

Effects of Thermal Erosion and Wear Resistance on AISI H13 Tool Steel by Various Surface Treatments

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