High Rate and High Temperature Fracture Behaviour of Polycrystalline Diamond

Petrovic, Marin; Ivanković, Alojz

doi:10.4028/www.scientific.net/kem.488-489.670

Cited by 5 publications

(3 citation statements)

References 4 publications

(8 reference statements)

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“…The series of tests on laser-cut cemented carbide specimens were previously performed in laboratory conditions at room temperature. Loading rate was varied from quasistatic of 1 mm/min up to dynamic of 5 m/s using the same procedure as outlined earlier in [1,2]. Using standard equations, the fracture toughness, fracture energy, flexural strength and Young's modulus were determined according to linear elastic fracture mechanics.…”

Section: Methodsmentioning

confidence: 99%

Flexural Strength Reduction in Cemented Carbides

Petrovic

Voloder

2015

Acta Phys. Pol. A

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Cemented carbides are hard materials used in tough materials machining as well as in situations where other tools would wear away. These are one of the most successful composite engineering materials ever produced. The advantage of cemented carbides is that their structure and composition can be engineered to have properties tailored to specific applications and operations. These materials allow faster and more precise machining and will leave a better surface finish. Carbide tools can also withstand higher temperatures than standard high speed steel tools. Considering their application and known range of properties, main disadvantage of cemented carbides is appearance of their sudden fracture during machining process. This is caused by the low toughness at dynamic rates and overcoming this problem is yet to be researched further. In order to understand these limitations and provide suggestions for the improved design of the material, combined experimental and numerical analysis is currently being performed. Cohesive strength values numerically determined using Dugdale cohesive zone model are compared to flexural strength obtained experimentally. Reduction in flexural strength was then analysed and explained, relating it to the flaw size on the tensile surface of the specimen.

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Section: Methodsmentioning

confidence: 99%

Flexural Strength Reduction in Cemented Carbides

Petrovic

Voloder

2015

Acta Phys. Pol. A

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“…The application of laser processing tools is affected by the laser parameters and material’s properties (e.g., absorption, electron relaxation time, binder, and grain size). For example, smaller grain sizes are more likely to suffer from thermal mismatch causing micro-cracks throughout the processed region [ 38 ] as heat conducts more in smaller grains [ 39 ]. The binder composition also affects the results of process.…”

Section: Introductionmentioning

confidence: 99%

Laser Processing of Hard and Ultra-Hard Materials for Micro-Machining and Surface Engineering Applications

2021

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Polycrystalline diamonds, polycrystalline cubic boron nitrides and tungsten carbides are considered difficult to process due to their superior mechanical (hardness, toughness) and wear properties. This paper aims to review the recent progress in the use of lasers to texture hard and ultra-hard materials to a high and reproducible quality. The effect of wavelength, beam type, pulse duration, fluence, and scanning speed is extensively reviewed, and the resulting laser mechanisms, induced damage, surface integrity, and existing challenges discussed. The cutting performance of different textures in real applications is examined, and the key influence of texture size, texture geometry, area ratio, area density, orientation, and solid lubricants is highlighted. Pulsed laser ablation (PLA) is an established method for surface texturing. Defects include melt debris, unwanted allotropic phase transitions, recast layer, porosity, and cracking, leading to non-uniform mechanical properties and surface roughness in fabricated textures. An evaluation of the main laser parameters indicates that shorter pulse durations (ns—fs), fluences greater than the ablation threshold, and optimised multi-pass scanning speeds can deliver sufficient energy to create textures to the required depth and profile with minimal defects. Surface texturing improves the tribological performance of cutting tools in dry conditions, reducing coefficient of friction (COF), cutting forces, wear, machining temperature, and adhesion. It is evident that cutting conditions (feed speed, workpiece material) have a primary role in the performance of textured tools. The identified gaps in laser surface texturing and texture performance are detailed to provide future trends and research directions in the field.

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“…Polycrystalline diamond (PCD) is widely used in various application, mainly as cutting tools for machining of nonferrous metals, non-metallic materials and also applied in rock drilling application [1,2]. Considered as among the hardest materials in the world, Polycrystalline diamond was found as suitable cutting tools for high speed machining application of aerospace materials such as Carbon fibre reinforced plastic (CFRP), aluminum alloys and titanium alloys [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Graphitization Catalyst Electrode in Electrical Discharge Machining of Polycrystalline Diamond-Finish-ing Condition

Andias,

Ahmad,

Rahim

et al. 2020

IJIE

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Electrical Discharge Machining (EDM) is a non-contact machining process that becomes famous in machining of Polycrystalline Diamond (PCD). The material is typically used as the cutting tools for aerospace and automotive industries. However, low electrical conductivity and high melting temperature of PCD has caused slower EDM process. This investigation purposely designed to investigate the influence of different types of electrode which are Copper (ordinary electrode) and Copper-Nickel (newly proposed graphitization catalyst electrode) on EDM performance of MRR and Ra. Interestingly the newly proposed electrode gave positive impact to the investigated performance indication. Cu-Ni electrode recorded 35% better in MRR than the Cu electrode, though with higher short-circuiting rate. Cu-Ni also provided the lowest Ra value with 10% better than the best Ra produced by Cu electrode. This phenomenon occurred as due to the high interaction between the catalyst materials of nickel and diamond which supported by the qualification data provided in this investigation.

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High Rate and High Temperature Fracture Behaviour of Polycrystalline Diamond

Cited by 5 publications

References 4 publications

Flexural Strength Reduction in Cemented Carbides

Flexural Strength Reduction in Cemented Carbides

Laser Processing of Hard and Ultra-Hard Materials for Micro-Machining and Surface Engineering Applications

The Influence of Graphitization Catalyst Electrode in Electrical Discharge Machining of Polycrystalline Diamond-Finish-ing Condition

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