Microstructural response of various chromium carbide based coatings to erosion and nano impact testing

Venkatesh, L.; Pitchuka, Suresh Babu; Sivakumar, G.; Gundakaram, R.; Joshi, Shrikant V.; Samajdar, I.

doi:10.1016/j.wear.2017.06.002

Cited by 33 publications

(10 citation statements)

References 38 publications

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“…The high strain rate contact in this test can provide much closer simulation of the performance of coatings systems under highly loaded intermittent contact and the evolution of wear under these conditions. In practice, studies have reported a strong correlation between coating performance in the nano-impact test and life of coated tools in high speed machining of hard-to-cut materials [43], and in solid particle erosion testing [44]. A cube corner diamond indenter whose geometry induces high contact strain is often chosen as the test probe, as this high contact strain is beneficial in inducing fracture within a short test time.…”

Section: Introductionmentioning

confidence: 99%

Micro-scale impact testing - A new approach to studying fatigue resistance in hard carbon coatings

Beake

Liskiewicz

Bird

et al. 2020

Tribology International

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Improving the fatigue resistance of DLC coatings under highly loaded repetitive contact is an important step to increasing their performance in demanding applications. The nano-impact test has been shown to be effective at highlighting differences in resistance to contact damage in thin hard carbon coatings deposited on hardened steel. A novel micro-scale rapid impact test capability capable of producing repetitive impacts at significantly higher strain rate and energy than in the nano-impact test has been developed recently enabling the study of coating fatigue with less sharp spherical indenters than in the nano-impact test.Results with the new micro-impact technique on two commercial hard carbon coatings (Graphit-iC and Dymon-iC from Teer Coatings) on tool steel are presented. The role of coating mechanical properties on the fatigue resistance and the load-sensitivity of the impact failure mechanism is discussed. The harder coating with higher sp 3 /sp 2 bonded C (Dymon-iC) was found to be significantly less durable under fatigue loading than the softer Graphit-iC. Reasons for the observed differences are discussed.

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Section: Introductionmentioning

confidence: 99%

Micro-scale impact testing - A new approach to studying fatigue resistance in hard carbon coatings

Beake

Liskiewicz

Bird

et al. 2020

Tribology International

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“…In the case of nanocrystalline grain size, more than 50% of atoms are associated with grain boundaries due to small grain size resulting in more contribution towards physical properties of material [25]. Nanocrystalline coatings can be deposited using several techniques, yet thermal spraying has been reported by several researchers as one of the best techniques available [46][47][48][49][50][51][52][53][54][55]. Thermal spraying with nanostructured feedstock powders has resulted in higher hardness, strength, and corrosion resistance compared to conventional powders.…”

Section: Nanostructured Cermet Coatingsmentioning

confidence: 99%

“…The failure mode and erosion mechanisms were influenced by microstructure of the coatings and the test conditions involving the removal of the carbide grains during the impact together with the corrosion of the binder seems to be insignificant; however, in the second case, the binder erodes inducing a loss of carbide grains after pronounced erosion [41,111]. A few nano and conventional coatings produced by sputtering technique, such as Cr/CrN multilayer, Ti-Si-C-N, CrSiN, as well as HVOF-sprayed Ni-Cr-Si-B-C, plasma-sprayed Ni 3 Al + Ni-22Cr-10Al-1Y, laser cladding Cr 3 C 2 -NiCrMoNb, and thermal reactive deposition Cr 7 C 3 coatings showed better erosion-corrosion resistance similar to Cr 3 C 2 -25NiCr coating over the substrate material at various conditions [47][48][49][50][51][52][53][54].…”

Section: Aisi 1018 Steel Erosion Corrosion Test Potentiodynamic Polarmentioning

confidence: 99%

Nanocrystalline Cermet Coatings for Erosion–Corrosion Protection

et al. 2019

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The processing techniques, microstructural characteristics, and erosion corrosion behaviour of Cr3C2–NiCr and tungsten carbide (WC)-based cermet coatings are reviewed in this work. Conventional and nanocrystalline Cr3C2–NiCr and WC-based cermet coatings are generally synthesized using thermal spray technique. The wear, erosion, and corrosion protection ability of conventional and nanocermet coatings are compared based on available literature. In Cr3C2–NiCr coatings, the corrosion resistance is offered by NiCr metal matrix while the wear resistance is provided by the carbide ceramic phase, making it suitable for erosion–corrosion protection. The nanocrystalline cermet coatings exhibits better erosion–corrosion resistance as compared to the conventional coatings. The nanocrystalline coatings reduces the erosion–corrosion rate significantly compared to conventional coatings. It is attributed to the presence of the protective NiCr metallic binder that allows easier and faster re-passivation when the coating is subjected to wear and the fine-grain structure with homogeneous distribution of the skeleton network of hard carbide phases. In addition, corrosion-accelerated erosion dominates the reaction mechanism of erosion–corrosion and, therefore, higher hardness, strength, and better wear resistance of nanocermet coating along with its faster repassivation kinetics accounts for improved corrosion resistance as compared to conventional coatings.

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“…Venkatesh et al studied erosion behaviour of chromium carbide based coating developed using atmospheric plasma spray and compared with detonation sprayed and laser cladded counterparts. 5 Authors reported drop in erosion resistance owning to the excessive decomposition of chromium carbides during plasma sprayed coating. Another study revealed that high temperature associated with laser cladding leads to decomposition of chromium carbides in the clad layer.…”

Section: Introductionmentioning

confidence: 99%

Microstructural and mechanical aspects of micrometric and nanometric Ni + 10% Cr₇C₃ composite microwave clads

Singh

Zafar

2020

Journal of Composite Materials

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In this paper, we present the development of micrometric and nanometric Ni + 10% Cr7C3 composite clad on ASTM A743 grade CA6NM hydroturbine steel through microwave irradiation. The microstructure of micrometric clad exhibited blade and rod-like structure of carbides embedded in [Formula: see text](Ni, Fe) solid solution, while nanometric clad leads to the evolution of petal-like structure of carbides. The developed nanometric clad shows uniform microstructural features with a low level of carbide decomposition. As a result, the average nanohardness and fracture toughness of nanometric clad improved by 38.11% and 8%, respectively, compared to the micrometric clad. Clads have porosity of the order of 1.1% and 0.81% for micrometric and nanometric clad, respectively.

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Microstructural response of various chromium carbide based coatings to erosion and nano impact testing

Cited by 33 publications

References 38 publications

Micro-scale impact testing - A new approach to studying fatigue resistance in hard carbon coatings

Micro-scale impact testing - A new approach to studying fatigue resistance in hard carbon coatings

Nanocrystalline Cermet Coatings for Erosion–Corrosion Protection

Microstructural and mechanical aspects of micrometric and nanometric Ni + 10% Cr₇C₃ composite microwave clads

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Microstructural response of various chromium carbide based coatings to erosion and nano impact testing

Cited by 33 publications

References 38 publications

Micro-scale impact testing - A new approach to studying fatigue resistance in hard carbon coatings

Micro-scale impact testing - A new approach to studying fatigue resistance in hard carbon coatings

Nanocrystalline Cermet Coatings for Erosion–Corrosion Protection

Microstructural and mechanical aspects of micrometric and nanometric Ni + 10% Cr7C3 composite microwave clads

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Microstructural and mechanical aspects of micrometric and nanometric Ni + 10% Cr₇C₃ composite microwave clads