The influence of residual thermal stresses on the mechanical properties of multilayer α-Al2O3/TiCxN1−x coatings on WC/Co cutting tools

Closed form expressions for the steady-state thermal stresses in a π/2 wedge, subject to constant-temperature heat sources on the rake and flank contact segments, are obtained from a conformal mapping solution to the steady-state heat conduction problem. It is shown, following a theorem of Muskhelishvili, that the only nonzero thermal stress in the plane-strain wedge is that acting normal to the wedge plane. The thermal stress solutions are superimposed on a previously published isothermal cutting-load solution, to give the complete thermoelastic stress distribution at the wedge surfaces. The thermoelastic stresses are then used to determine the distribution of the equivalent stress, and this gives an indication of the regions on a cutting tool which are likely to be in the plastic state. The results are discussed in relation to the problems of flank wear and rakeface crater wear in metal cutting tools.

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Performance characteristics of steel 1.2842 after nitridation

Science & Military ◽

10.52651/sam.a.2021.1.43-48 ◽

2021 ◽

Vol 16 (1) ◽

pp. 43-48

Author(s):

Michal Krbaťa ◽

◽

Jana Escherová ◽

Keyword(s):

Mechanical Properties ◽

Surface Roughness ◽

Wear Resistance ◽

Chemical Composition ◽

Plasma Nitriding ◽

Cutting Tools ◽

Operating Costs ◽

Mechanical And Tribological Properties ◽

Structure Thickness ◽

Pin On Disc

The paper deals with the change in mechanical properties and wear of 1.2842 universal tool steel after plasma nitriding, which is widely used to produce cutting tools with good durability and low operating costs. Plasma nitriding was performed at a temperature of 500 °C for 10-hour period in a standard N2 /H2 atmosphere with 1:3 gases ratio. Microstructure, phase structure, thickness of a nitriding layer and surface roughness of samples were measured with optical microscopes and a profilometer. Verification of a chemical composition was carried out on the BAS TASMAN Q4 device. Wear resistance was measured on a universal TRIBOLAB UTM 3 tribometer, through a, “pin on disc“ method. The results of experiments have shown that plasma nitriding process, significantly improves the mechanical and tribological properties of selected materials.

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Estimation of Effective Thermal and Mechanical Properties of Particulate Thermal Interface Materials (TIMs) by a Random Network Model

ASME 2017 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems ◽

10.1115/ipack2017-74129 ◽

2017 ◽

Cited By ~ 1

Author(s):

Pavan Kumar Vaitheeswaran ◽

Ganesh Subbarayan

Keyword(s):

Mechanical Properties ◽

Network Model ◽

Thermal Stresses ◽

Volume Fraction ◽

Random Network ◽

Thermal Interface Materials ◽

Thermal And Mechanical Properties ◽

Thermal Interface ◽

Classical Models ◽

Interface Materials

Particulate thermal interface materials (TIMs) are commonly used to transport heat from chip to heat sink. While high thermal conductance is achieved by large volume loadings of highly conducting particles in a compliant matrix, small volume loadings of stiff particles will ensure reduced thermal stresses in the brittle silicon device. Developing numerical models to estimate effective thermal and mechanical properties of TIM systems would help optimize TIM performance with respect to these conflicting requirements. Classical models, often based on single particle solutions or regular arrangement of particles, are insufficient as real-life TIM systems contain a distriubtion of particles at high volume fractions, where classical models are invalid. In our earlier work, a computationally efficient random network model was developed to estimate the effective thermal conductivity of TIM systems [1,2]. This model is extended in this paper to estimate the effective elastic modulus of TIMs. Realistic microstructures are simulated and analyzed using the proposed method. Factors affecting the modulus (volume fraction and particle size distribution) are also studied.

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Development of High Performance Silicon Nitride Ceramics and their Applications

MRS Proceedings ◽

10.1557/proc-287-189 ◽

1992 ◽

Vol 287 ◽

Cited By ~ 22

Author(s):

Yo Tajima

Keyword(s):

Mechanical Properties ◽

Silicon Nitride ◽

High Performance ◽

Future Prospect ◽

Cutting Tools ◽

Sintering Process ◽

Sintering Additives ◽

Nitride Ceramics ◽

Engine Components

ABSTRACTProgress in sintering process and improvement of mechanical properties of silicon nitride ceramics are reviewed. Emphases are placed on contributions of advanced sintering techniques and better understanding of sintering additives and microstructure-properties relations. Current applications as engine components and cutting tools are described, and future prospect is considered.

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Preparation and mechanical properties of short carbon fibers reinforced α-Al2O3-based composites

Ceramics International ◽

10.1016/j.ceramint.2018.07.163 ◽

2018 ◽

Vol 44 (16) ◽

pp. 19345-19351 ◽

Cited By ~ 8

Author(s):

Jiangang Jia ◽

Diqiang Liu ◽

Changqi Gao ◽

Genshun Ji ◽

Tieming Guo

Keyword(s):

Mechanical Properties ◽

Carbon Fibers ◽

Α Al2o3 ◽

Short Carbon

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Synergistic Effect of Nano-α-Al2O3 Particles on Mechanical Properties of Glass-fibre reinforced Epoxy Hybrid Composites

JOURNAL OF POLYMER MATERIALS ◽

10.32381/jpm.2020.37.3-4.1 ◽

2021 ◽

Vol 37 (3-4) ◽

pp. 121-130

Author(s):

ANIL KUMAR VEERAPANENI ◽

◽

CHANDRASEKAR KUPPAN ◽

MURTHY CHAVALI ◽

◽

...

Keyword(s):

Mechanical Properties ◽

Synergistic Effect ◽

Glass Fibre ◽

Hybrid Composites ◽

Glass Fibre Reinforced ◽

Al2o3 Particles ◽

Α Al2o3

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A Study on the Mechanical Properties of Al2O3 Cutting Tools by DLP-based 3D Printing

Journal of Korean Powder Metallurgy Institute ◽

10.4150/kpmi.2019.26.6.508 ◽

2019 ◽

Vol 26 (6) ◽

pp. 508-514

Author(s):

Hyun-Been Lee ◽

Hye-Ji Lee ◽

Kyung-Ho Kim ◽

Kyung-Min Kim ◽

Sung-Soo Ryu ◽

...

Keyword(s):

Mechanical Properties ◽

3D Printing ◽

Cutting Tools

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Study on Microstructure and Mechanical Properties of WC-10Ni3Al Cemented Carbide Prepared by Different Ball-Milling Suspension

Materials ◽

10.3390/ma12142224 ◽

2019 ◽

Vol 12 (14) ◽

pp. 2224 ◽

Cited By ~ 3

Author(s):

Minai Zhang ◽

Zhun Cheng ◽

Jingmao Li ◽

Shengguan Qu ◽

Xiaoqiang Li

Keyword(s):

Mechanical Properties ◽

Fracture Toughness ◽

Ball Milling ◽

Grain Growth ◽

Organic Solvents ◽

Crack Deflection ◽

Cemented Carbides ◽

Powder Metallurgy Method ◽

Microstructure And Mechanical Properties ◽

Α Al2o3

In this paper, WC-10Ni3Al cemented carbides were prepared by the powder metallurgy method, and the effects of ball-milling powders with two different organic solvents on the microstructure and mechanical properties of cemented carbides were studied. We show that the oxygen in the organic solvent can be absorbed into the mixed powders by ball-milling when ethanol (CH3CH2OH) is used as a ball-milling suspension. This oxygen leads to the formation of α-Al2O3 during sintering, which improves the fracture toughness, due to crack deflection and bridging, while the formation of η-phase (Ni3W3C) inhibits the grain growth and increases the hardness. Alternatively, samples milled using cyclohexane (C6H12) showed grain growth during processing, which led to a decrease in hardness. Therefore, the increase of oxygen content from using organic solvents during milling improves the properties of WC-Ni3Al composites. The growth of WC grains can be inhibited and the hardness can be improved without loss of toughness by self-generating α-Al2O3 and η-phase (Ni3W3C).

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