Mechanical response under contact loads of AlCrN-coated tool materials

Yang, Jing; Botero, Carlos; Cornu, N; Ramírez, G.; Mestra, A.; Llanes, L.

doi:10.1088/1757-899x/48/1/012003

Cited by 6 publications

(3 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(Authors) R2 is completely right about the relevance of coating composition on the contact damage response of coated hardmetals. Indeed, it has been the main topic addressed by UPC's research group in recent papers (References [40], [43] and [44]), and interested readers may get further information on this issue there. However, the variable experimentally studied in this investigation was "substrate surface finish", while the coatings' features were kept unchanged.…”

Section: (R1) It Is Not Clear Why the Effect Of The Co Binder In The mentioning

confidence: 99%

“…Recently it has also been applied to introduce controlled damage in cemented carbides [39] as well as in coated hardmetals and tool steels [40][41][42][43][44]. The main reason for the popularity of this technique is the fact that a spherical indenter delivers concentrated stresses over a small area of the specimen surface, such that typical "blunt" service-like conditions are simulated and damage evolution associated with increasing load can be examined.…”

Section: Evaluation Of Contact Damage Resistancementioning

confidence: 99%

See 1 more Smart Citation

Contact damage resistance of TiN-coated hardmetals: Beneficial effects associated with substrate grinding

Yang

Marro

Trifonov

et al. 2015

Surface and Coatings Technology

View full text Add to dashboard Cite

Contact loading is a common service condition for coated hardmetal tools and components. Substrate grinding represents a key step within the manufacturing chain of these coated systems. Within this context, the influence of surface integrity changes caused by abrasive grinding of the hardmetal substrate, prior to coating, is evaluated with respect to contact damage resistance. Three different substrate surface finish conditions are studied: ground (G), mirror-like polished (P) and ground plus heat-treated (GTT). Tests are conducted by means of spherical indentation under increasing monotonic load and the contact damage resistance is assessed. Substrate grinding enhances resistance against both crack nucleation at the coating surface and subsequent propagation into the hardmetal substrate. Hence, crack emergence and damage evolution is effectively delayed for the coated G condition, as compared to the reference P one. The observed system response is discussed on the basis of the beneficial effects associated with compressive residual stresses remnant at the subsurface level after grinding, ion-etching, and coating. The influence of the stress state is further corroborated by a lower resistance against damage for the coated GTT specimens. Finally, it is proposed and preliminary validated that substrate grinding also enhances damage tolerance of the coated system when exposed to contact loads. M.P. Johansson-Jõesaar and L. LlanesDear Professor Matthews, Please find attached electronic files corresponding to our contribution on contact damage resistance of TiN-coated hardmetals: beneficial effects associated with substrate grinding, which we (all authors do agree to the submission of the manuscript) offer for publication in Surface and Coatings Technology.I hope it is found satisfactory. (Procedia CIRP, Volume 13, 2014, Pages 257-263).(Authors) R1 is right about connection between results published in our contribution to the 2nd CIRP Conference on Surface Integrity (reference [27] in the submitted manuscript) and those presented in this paper. However, the two papers are distinctly different and cover completely different research topics and contain different data. The former focuses on "ground hardmetals" and "flexural strength/fractography", whereas the current one deals with "coated hardmetals" and "contact damage". Hence, we find R1's comment regarding "similar results" inappropriate. (Authors) Co binder effects on residual stresses are not neglected, and our writing may be blamed for such misunderstanding. Residual stresses induced by grinding are "macrostresses" evaluated in the WC phase and assumed to be representative of the whole WC-Co composite. They are different from the "microstresses" (different for each individual phase) that arise due to the difference in thermal expansion between the binder and the carbide as the material cools from liquid-or solid-phase sintering. In cemented carbides with WC as the carbide, the WC is taken as a reliable reference phase because it remains stoichiometric...

show abstract

Section: (R1) It Is Not Clear Why the Effect Of The Co Binder In The mentioning

confidence: 99%

Section: Evaluation Of Contact Damage Resistancementioning

confidence: 99%

Contact damage resistance of TiN-coated hardmetals: Beneficial effects associated with substrate grinding

Yang

Marro

Trifonov

et al. 2015

Surface and Coatings Technology

View full text Add to dashboard Cite

show abstract

“…In macro-scale impact tests using mm-sized WC indenters, the stresses for plasticity are far into the substrate, and hence, fatigue behaviour is influenced by substrate properties [1,129]. Knotek [1] noted that CrN coatings had better impact resistance when deposited on tool steel than on hard metal substrate due to stress relief by plastic deformation.…”

Section: Substrate Effectsmentioning

confidence: 99%

Nano- and Micro-Scale Impact Testing of Hard Coatings: A Review

Beake

2022

Coatings

View full text Add to dashboard Cite

In this review, the operating principles of the nano-impact test technique are described, compared and contrasted to micro- and macro-scale impact tests. Impact fatigue mechanisms are discussed, and the impact behaviour of three different industrially relevant coating systems has been investigated in detail. The coating systems are (i) ultra-thin hard carbon films on silicon, (ii) DLC on hardened tool steel and (iii) nitrides on WC-Co. The influence of the mechanical properties of the substrate and the load-carrying capacity (H3/E2) of the coating, the use of the test to simulate erosion, studies modelling the nano- and micro-impact test and performing nano- and micro-impact tests at elevated temperature are also discussed.

show abstract

Effects of Edge Radius and Coating Thickness on the Cutting Performance of AlCrN-Coated Tool

Malekan,

Ilvig,

Aghababaei

2024

Int. J. Precis. Eng. Manuf.

View full text Add to dashboard Cite

High-speed machining is a practical way to attain high productivity with lower costs. Under this condition, the tool geometry needs to be optimized to sustain high cutting forces and temperatures. The sharpness of the cutting edge and the coating thickness (CT) are two key parameters that affect the tool’s performance. While a sharp edge eases the cutting process, it causes a high stress concentration, which increases the wear rate and eventual edge fracture. In this study, we use a combination of finite element simulations and experimental testing to evaluate the effects of CT ( 1–3 μm), edge radius ($$r_{\beta }$$ r β , 6–15 μm), and coefficient of friction ($$\upmu = 0 - 0.2$$ μ = 0 - 0.2 ) on the stress distribution at the cutting edge. Our simulations showed that the larger the CT, the higher the stress magnitude inside the coating, but the lower the maximum stress depth percentile. Considering an industrial case of cutting steel workpieces using AlCrN-coated tungsten carbide tools under given cutting parameters, our simulations suggested an optimum CT of 3 μm. By manufacturing a series of milling tools with different CTs and edge radii, we validated the simulation results using a set of well-controlled milling experiments. Finally, the edge radius should be selected considering the size of rake/flank angle mainly to control stress distribution over the cutting edge.

show abstract

Mechanical response under contact loads of AlCrN-coated tool materials

Cited by 6 publications

References 17 publications

Contact damage resistance of TiN-coated hardmetals: Beneficial effects associated with substrate grinding

Contact damage resistance of TiN-coated hardmetals: Beneficial effects associated with substrate grinding

Nano- and Micro-Scale Impact Testing of Hard Coatings: A Review

Effects of Edge Radius and Coating Thickness on the Cutting Performance of AlCrN-Coated Tool

Contact Info

Product

Resources

About