Surface evolution of vermicular cast iron in ultra-high temperature combustion with different single-pulsing duration

Tang, Chengwei; Liu, Lei; Yang, Zhong; Dong, Tao; Li, Jianping; Guo, Qiaoqin; Zhen, Jieru; He, Yu; He, Hongxiao

doi:10.1016/j.engfailanal.2022.106679

Cited by 8 publications

(3 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thermal load is another important factor affecting the interfacial debonding phenomenon. Many parts in diesel engines are manufactured with cast irons, where the inner wall of the combustion chamber can reach temperature levels of 400 • C to 600 • C [17]. In these high-temperature service conditions, different magnitudes of the coefficients of thermal expansion of the graphite inclusions and the metallic matrix can cause the onset of interfacial debonding even without mechanical loads.…”

Section: Introductionmentioning

confidence: 99%

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

Cao

Baxevanakis

Silberschmidt

2023

Metals

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%

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

Cao

Baxevanakis

Silberschmidt

2023

Metals

View full text Add to dashboard Cite

show abstract

“…In these cast irons, the formation of spherical graphites leads to the reduction of stress concentration and, as a result, the improvement of mechanical behavior. Of course, it should be noted that the morphology of graphites (geometrical shape, size, distribution, and degree of sphericity of graphites) has a great influence on the mechanical behavior of cast iron, which is influenced by the type and amount of alloying elements, cooling speed, and solidification process, as well as heat treatment [5][6][7]. Studies show that the physical and mechanical properties of ductile irons depend on their microstructure, especially the type, distribution, and dispersion of spherical graphites [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties prediction of ductile iron with spherical graphite using multi-scale finite element model

Alizadeh,

Ajri,

Maleki

2023

Phys. Scr.

View full text Add to dashboard Cite

In this paper, using the multi-scale finite element method, the effect of graphite particles on the mechanical behavior of ductile iron has been investigated under tensile loading. For this purpose, taking into account the spherical geometric shape of the graphite phase and considering a specific volume fraction, these spheres are randomly placed in the whole body and a two-component composite material is created. Next, by defining the mechanical properties of two separate phases including the matrix and graphites as well as the interfaces between these two phases, a micromechanical model is developed for these materials. The mechanical properties of the matrix are simulated using the Ramberg-Osgood elastic-plastic model. By simulation in ABAQUS software and using nonlinear dynamic analysis, the effects of volume percentages and adhesion of graphite particles with matrix on the direct tensile load-displacement behavior of ductile iron were investigated. The results of experimental tests were used to verify the results of the numerical model. The weight percentage of graphite particles has a significant effect on the tensile strength and elastic modulus of these cast irons. The results show that with the increase in the amount of graphite particles, the tensile strength of cast iron increases up to a certain value and then reverses. With 21% graphite particles, the maximum tensile strength of ductile iron is 601 MPa. Compared with a pure sample of cast iron, the tensile strength increases by approximately 13.4% for this weight percentage of graphite particles.

show abstract

“…Compared with GCI, CGI has better tensile strength, better toughness and lower thermal conductivity. Products made of CGI are lighter-weight, quieter, more wear-resistant and less expensive than GCI products [ 3 , 4 ]. Therefore, they are more suitable for manufacturing large and medium-sized engines.…”

Section: Introductionmentioning

confidence: 99%

Effect of Tool Coatings on Machining Properties of Compacted Graphite Iron

Tan

et al. 2022

Micromachines

View full text Add to dashboard Cite

Compacted graphite iron (CGI) has become the most ideal material for automotive engine manufacturing owing to its excellent mechanical properties. However, tools are severely worn during processing, considerably shortening their lifespan. In this study, we prepared a series of cemented carbide-coated tools and evaluated their coating properties in cutting tests. Among all tested coatings, PVD coating made of AlCrN (AC) presented with the best surface integrity and mechanical properties, achieving the best comprehensive performance in the coating test. The AC-coated tool also exhibited the best cutting performance at a low speed of 120 m/min, corresponding to a 60% longer cutting life and the lowest workpiece surface roughness relative to other coated tools. In the cutting test at a high speed of 350 m/min, the CVD double-layer coated tool (MT) with a TiCN inner layer of and an Al2O3 outer layer had a 70% longer cutting life and the lowest workpiece surface roughness relative to other coated tools.

show abstract

Surface evolution of vermicular cast iron in ultra-high temperature combustion with different single-pulsing duration

Cited by 8 publications

References 31 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

Mechanical properties prediction of ductile iron with spherical graphite using multi-scale finite element model

Effect of Tool Coatings on Machining Properties of Compacted Graphite Iron

Contact Info

Product

Resources

About