Formation mechanism of alumina layer in protecting cubic boron nitride inserts in turning cast irons

Nguyen, Dinh; Tooptong, Sirisak; Park, K.-H.; Kwon, Patrick

doi:10.1016/j.ijmachtools.2020.103539

Cited by 21 publications

(2 citation statements)

References 41 publications

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“…Accounting for 70% of the total metal production, cast irons are widely used in the automotive industry [1]. Since its first observation in 1948 [2] as a type of cast iron, compacted graphite iron (CGI) was used in numerous industrial applications, including in internal combustion engines (cylinder heads, blocks, brake drums [3], and exhaust manifolds [4]), machinery, and pipes.…”

Section: Introductionmentioning

confidence: 99%

“…In contrast to many other types of cast irons, the complex microstructure of CGI includes all three types of graphite inclusions that affect its performance [9]. Grey cast iron with a simple microstructure of only flake graphite particles is the most commonly used material in diesel engines [1]; however, the application of CGI provides opportunities for power increase and weight reduction, while [3] contributing to highly powerful nextgeneration diesel engines [10]. In engine applications, CGI faces high-temperature and -pressure working conditions.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Graphite Morphology on the Thermomechanical Performance of Compacted Graphite Iron

Cao

Baxevanakis

Silberschmidt

2023

Metals

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Compacted graphite iron (CGI) has gained significant attention in automotive industry applications thanks to its superior thermomechanical properties and competitive price. Its main fracture mechanism at the microscale—interfacial damage and debonding between graphite inclusions and a metallic matrix—can happen under high-temperature service conditions as a result of a mismatch in the coefficients of thermal expansion between the two phases of CGI. Macroscopic fracture in cast iron components can be initiated by interfacial damage at the microscale under thermomechanical load. This phenomenon was investigated in various composites but still lacks information for CGI, with its complex morphology of graphite inclusions. This research focuses on the effect of this morphology on the thermomechanical performance of CGI under high temperatures. A set of three-dimensional finite-element models was created, with a unit cell containing a single graphite inclusion embedded in a cubic domain of the metallic matrix. Elastoplastic behaviour was assumed for both phases in numerical simulations. The effect of graphite morphology on the thermomechanical performance of CGI was investigated for pure thermal loading, focusing on a high-temperature response of its constituents. The results can provide a deeper understanding of the correlation between graphite morphology and CGI fracture mechanisms under high temperatures.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Graphite Morphology on the Thermomechanical Performance of Compacted Graphite Iron

Cao

Baxevanakis

Silberschmidt

2023

Metals

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Tool life experiment of coated cermet during nodular cast iron turning

Lánc,

Fiala,

Zouhar

2024

Int J Adv Manuf Technol

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In this study, the application of physical vapor deposition (PVD) coatings on various cermet substrates for the machining of nodular cast iron was investigated, given that cermet materials are traditionally not the primary choice for such applications. Through the evaluation of key parameters including wear on the flank face and surface roughness, and with vibration analysis serving as a supplementary measurement, it was discovered that machining stability is compromised by the inherent brittleness of cermet and the adhesion of material on the rake face. While the application of coatings was found to extend tool life, the cermet-coating combinations did not surpass the performance of other materials such as cemented carbide with multi-layer coatings. Notably, the stability of surface roughness across various stages of tool wear was observed.

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A new modeling approach for stress–strain relationship taking into account strain hardening and stored energy by compacted graphite iron evolution

Niu,

Huang,

Shi

et al. 2023

Front. Mech. Eng.

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Formation mechanism of alumina layer in protecting cubic boron nitride inserts in turning cast irons

Cited by 21 publications

References 41 publications

Effect of Graphite Morphology on the Thermomechanical Performance of Compacted Graphite Iron

Effect of Graphite Morphology on the Thermomechanical Performance of Compacted Graphite Iron

Tool life experiment of coated cermet during nodular cast iron turning

A new modeling approach for stress–strain relationship taking into account strain hardening and stored energy by compacted graphite iron evolution

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