Dry cutting performance of HSS twist drills coated with improved TiAlN

Smith, I.J.; Gillibrand, D.; Brooks, John S.; Münz, W.‐D.; Harvey, S. J.; Goodwin, Robert J.

doi:10.1016/s0257-8972(96)03113-1

Cited by 80 publications

(24 citation statements)

References 13 publications

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“…Among all TM nitrides, group IVb TM nitride alloys, particularly TiN and TiN-based alloys, have been extensively studied [12,[41][42][43]. These TiN-based alloys include TiAlN [44][45][46][47], TiZrN [48,49], TiNbN [50,51], TiSiN [52] and similar ternary and quaternary alloys.…”

Section: Transition-metal Nitridesmentioning

confidence: 99%

“…Pettifor [110] proposed that Cauchy pressure, defined as (C 12 -C 44 ), can be used as an indicator to classify a material as brittle or ductile. The changes in C 12 -C 44 Atomic ordering in alloys can result in properties that are different from a compositionally homogenous solid. Tian et al [111] showed that sputter deposited TiWN alloys exhibit ordering in the cation metal sublattice leading to the formation of the Cu-Pt structure.…”

Section: Density Functional Theorymentioning

confidence: 99%

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Toughness Enhancement in Hard Single-Crystal Transition-Metal Nitrides : V-Mo-N and V-W-N Alloys

Kindlund¹

2014

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A mis Padres y Hermano, a la Abuela.ii iii ABSTRACT Transition-metal nitrides are known for their high hardness, good wear resistance, hightemperature stability, and chemical inertness. Because of these properties, they are extensively used in many industrial applications, notably as protective wear, erosion, and scratch resistant coatings, which are often subjected to high thermo-mechanical stresses. While high hardness is essential, most applications also require high ductility, to avoid brittle failure due to cracking. However, transition-metal nitrides, as most ceramics, generally exhibit low ductility and hence poor toughness.Improving toughness, the combination of hardness and ductility, of ceramic materials requires suppression of crack initiation and/or propagation, both of which depend on the microstructure, electronic structure, and bonding nature of the coating material. This, however, is an extremely challenging task that requires a fundamental understanding of the mechanical behavior of materials. Theoretical studies, for example, ab initio calculations and simulations are therefore useful in the design of "unbreakable" materials by providing information about the electronic origins of hardness and ductility. Recent density functional theory calculations predicted that alloying can increase toughness in a certain family of transition-metal nitrides such as V-Mo-N and V-W-N alloys. Toughness enhancement in these alloys arises from a near optimal filling of the metallic d-t 2g states, due to their high valence electron concentrations, leading to an orbital overlap which favors ductility during shearing.This thesis focuses on the growth and characterization of V 1-x Mo x N y (0 ≤ x ≤ 0.7, 0.55 ≤ y ≤ 1.03) and V 1-x W x N y (0 ≤ x ≤ 0.83, 0.75 ≤ y ≤ 1.13) cubic alloy thin films. I show that alloying VN with WN increases the alloy hardness and reduces the elastic modulus, an indication of enhanced toughness. I investigated the growth, nanostructure, and atomic ordering of as-deposited V 1-x W x N y (001)/MgO(001) thin films. In addition, I studied the growth, structural and mechanical properties, and electronic structure of V 1-x Mo x N y (001)/MgO(001) and V 0.5 Mo 0.5 N y (111)/Al 2 O 3 (0001) thin films. I demonstrate that these alloys exhibit not only higher hardness than the parent binary compound, VN, but also dramatically increased ductility. V 0.5 Mo 0.5 N hardness is more than 25% higher than that of VN. Using nanoindentation I show that while VN and TiN reference samples undergo severe cracking typical of brittle ceramics, V 0.5 Mo 0.5 N films do not crack. Instead, they exhibit material pile-up around nanoindents, characteristic of plastic flow in ductile materials. Furthermore, the wear resistance of V 0.5 Mo 0.5 N is significantly higher than that of VN. I also show, for the first time, anion-vacancy-induced toughening of single-crystal V 0.5 Mo 0.5 N y /MgO(001) films. Nanoindentation hardness of these alloys increases with the introduction of N-vacancies, while the elastic modulus remains ...

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Section: Transition-metal Nitridesmentioning

confidence: 99%

Section: Density Functional Theorymentioning

confidence: 99%

Toughness Enhancement in Hard Single-Crystal Transition-Metal Nitrides : V-Mo-N and V-W-N Alloys

Kindlund¹

2014

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“…The aluminum is frequently used to form titanium-aluminum nitride (Ti-Al)N [9]- [12]. (Ti-Al)N thin films deposited by PVD have high hardness at elevated temperatures ( 800 o C) and improved performance in cutting operations at higher velocities compared to TiN [13], [14].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Counterpart Material on the Sliding Wear of TiAlN Coatings Deposited by Reactive Cathodic Pulverization

et al. 2015

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This work aims to study the effect of the counterpart materials (100Cr6, Al2O3 and WC-Co) on the tribological properties of TiAlN thin films deposited on AISI H13 steel substrate by reactive magnetron co-sputtering. The structural characterization of the TiAlN films, performed by X-ray diffraction, showed (220) textured fcc crystalline structure. The values of hardness and elastic modulus obtained by nanoindentation were 27 GPa and 420 GPa, respectively, which resulted in films with a relatively high resistance to plastic deformation. Ball-on-disk sliding tests were performed using normal loads of 1 N and 3 N, and 0.10 m/s of tangential velocity. The wear coefficient of the films was determined by measuring the worn area using profilometry every 1000 cycles. The mechanical properties and the chemical stability of the counterpart material, debris formation and the contact stress influences the friction and the wear behavior of the studied tribosystems. Increasing the hardness of the counterpart decreases the coefficient of friction (COF) due to lower counterpart material transference and tribofilm formation, which is able to support the contact pressure. High shear stress concentration at the coating/substrate interface was reported for higher load promoting failure of the film-substrate system for all tribopairs.

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“…In addition to the high hardness, TiAlN coatings have chemical stability, longer tool life and excellent machining performance. [7,8]. The TiAlN coatings have also shown some interesting properties such as high fracture toughness, corrosion and wear resistance [9].…”

Section: Introductionmentioning

confidence: 99%

Prediction of thrust forces and hole diameters using artificial neural networks in drilling of AISI D2 tool steel with cemented carbide tools

Akincioğlu¹,

Mendi²,

Çıçek³

et al. 2013

A P J Eng Sci

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In this study, the effects of cutting speed, feed rate and different types of coating materials on thrust force and hole diameter were investigated in drilling of AISI D2 cold work tool steel. In addition, the thrust forces and hole diameters were predicted by artificial neural networks (ANN) using experimental data. Uncoated, TiN, TiAlN monolayer and TiAlN/TiN multi-layer coated cemented carbide drills with diameter of 5 mm were used in drilling experiments. The holes were drilled at different combinations of four cutting speeds (50, 55, 60, 65 m/min), two feed rates (0.063 and 0.08 mm/rev), and fixed depth of cut (7 mm). Experimental results showed that the lowest thrust forces and hole diameters were obtained with TiAlN/TiN multi-layer coated drills. After ANN training, it was found that the R 2 values are very close to 1 for both training and test sets. RMSE values are smaller than 0.03, and mean error values are smaller than 5% for the test set. This case shows that ANN is a powerful method for prediction of thrust forces and hole diameters.

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Dry cutting performance of HSS twist drills coated with improved TiAlN

Cited by 80 publications

References 13 publications

Toughness Enhancement in Hard Single-Crystal Transition-Metal Nitrides : V-Mo-N and V-W-N Alloys

Toughness Enhancement in Hard Single-Crystal Transition-Metal Nitrides : V-Mo-N and V-W-N Alloys

The Effect of Counterpart Material on the Sliding Wear of TiAlN Coatings Deposited by Reactive Cathodic Pulverization

Prediction of thrust forces and hole diameters using artificial neural networks in drilling of AISI D2 tool steel with cemented carbide tools

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