Three-Body Abrasive Behavior of Cementite–Iron Composite with Different Cementite Volume Fractions

Zheng, Baochao; Huang, Zhifu; Xing, Jiandong; Wang, Yong; Jian, Yongxin; Xiao, Yiyang; Fan, Xiaoli

doi:10.1007/s11249-016-0683-x

Cited by 20 publications

(10 citation statements)

References 23 publications

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“…For example, recent nanoindentation experiments suggested that Fe hardness increases linearly with C content, by up to an order of magnitude for pure Fe 3 C (cementite) [55]. However, both CND and CNO nanoparticles are harder than carbon steel and hence the high boundary pressure is expected to be accommodated in the same manner, with the slab deforming around the nanoparticle.…”

Section: Effect Of Normal Pressurementioning

confidence: 99%

Nonequilibrium Molecular Dynamics Investigation of the Reduction in Friction and Wear by Carbon Nanoparticles Between Iron Surfaces

et al. 2016

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For the successful development and application of novel lubricant additives, a full understanding of their tribological behaviour at the nanoscale is required, but this can be difficult to obtain experimentally. In this study, nonequilibrium molecular dynamics simulations are used to examine the friction and wear reduction mechanisms of promising carbon nanoparticle friction modifier additives. Specifically, the friction and wear behaviour of carbon nanodiamonds (CNDs) and carbon nano-onions (CNOs) confined between a-iron slabs is probed at a range of coverages, pressures, and sliding velocities. At high coverage and low pressure, the nanoparticles do not indent into the a-iron slabs during sliding, leading to zero wear and a low friction coefficient. At low coverage and high pressure, the nanoparticles indent into, and plough through the slabs during sliding, leading to atomic-scale wear and a much higher friction coefficient. This contribution to the friction coefficient is well predicted by an expression developed for macroscopic indentation by Bowden and Tabor. Even at the highest pressures and lowest coverages simulated, both nanoparticles were able to maintain separation of the opposing slabs and reduce friction by approximately 75 % compared to when no nanoparticle was present, which agrees well with experimental observations. CNO nanoparticles yielded a lower indentation (wear) depth and lower friction coefficients at equal coverage and pressure with respect to CND, making them more attractive friction modifier additives. Potential changes in behaviour on harder and softer surfaces are also discussed, together with the implications that these results have in terms of the application of the studied nanoparticles as lubricants additives.

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Section: Effect Of Normal Pressurementioning

confidence: 99%

Nonequilibrium Molecular Dynamics Investigation of the Reduction in Friction and Wear by Carbon Nanoparticles Between Iron Surfaces

et al. 2016

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“…Two methods have been developed to synthesize a large sample of a single-phase cementite. One is the use of high temperature and high pressure 13,[37][38][39][40][41][42][43][44][45][46] and the other is the sintering of mechanically alloyed powder 26,[47][48][49] as will be described in detail later. In addition to these four types of samples, there are samples prepared by special techniques, including single-phase thin films 25,50) prepared by the vapor deposition method; samples in which iron and graphite are melted, crushed, and cementite is extracted and sintered; 51) cementite single-crystal foil electrolytically extracted from a pearlitic sample; 35) and a sample in which the cementite volume fraction is locally increased by carburization.…”

Section: Samples Used To Study the Physical Properties Of Cementitementioning

confidence: 99%

Mechanical Properties of Cementite

Umemoto

Ohtsuka

2022

ISIJ Int.

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This review focuses on the mechanical properties of single-phase cementite. The mechanical properties of interest are 1) sound velocity, 2) elastic constants, 3) hardness, 4) plastic deformation mechanism, 5) wear, 6) fracture toughness, and 7) crystal orientation anisotropy. The effects of temperature, magnetic transition, and alloying elements on the sound velocity, elastic constants, and hardness were reviewed. Furthermore, experimental values of the above mechanical properties as well as other parameters, such as the specimen shape, the quantity of alloying elements, and the measurement method, were collected. A large variation was observed in the reported experimental values. The main reason for this is that cementite is metastable, and it is difficult to prepare large single-phase samples. Other factors, such as sample shape, measurement method, alloying element, magnetic transformation, and crystal orientation anisotropy, also influenced the measured values. Studies using first-principles calculations of cementite were also reviewed. The crystal orientation anisotropy of each elastic constant of single-crystal cementite based on the first-principles calculations are summarized, and its comparison with the experimental results is discussed. By comparing the elastic constants obtained by the first-principles calculations with the measured values, the former values of Young's modulus and shear modulus are several % and bulk modulus and Poisson's ratio are several tens of % larger than those of the latter. This is thought to be because of the difference in temperature between 0 K (first-principles calculations) and room temperature (measured value), and theoretical and experimental studies in which the temperature is changed are expected.

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“…1. The samples were fixed on the abrasive tester during spiral motion under applied pressures of 20, 35, and 50 N. An SiO 2 sandpaper (mesh: 40-120; hardness: 800-900 HV) [6] was used, as shown in Fig. 2.…”

Section: Two-body Abrasion Wear Testmentioning

confidence: 99%

“…Carbides resist the wear process by protecting the metal matrix from further cutting during the wear process; on the other hand, the toughness of the metal matrix (e.g., pearlite matrix, martensite matrix, and steel/iron) provides support to the worn carbide leading to plastic compensation for the carbide during the wear process. The combined protective and supporting effect leads to the reduction in the wear weight loss of the composite; this effect is referred to as the interaction between the hard wear-resistant phase and the tough phase in WCI [5][6][7]. Carbide, which is an important hard phase in this material, plays a key role in resisting the wear process, and thus, the properties of carbide 2 Friction | https://mc03.manuscriptcentral.com/friction directly affect the abrasion properties of material.…”

Section: Introductionmentioning

confidence: 99%

Effect of interaction between cementite and pearlite on two-body abrasive wear behaviors in white cast iron

Zheng

et al. 2020

Friction

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The wear interaction of cementite and pearlite in the white cast iron (WCI) was investigated using the two-body abrasive wear test under contact loads of 20, 35, and 50 N. The wear behavior, wear surface morphology, sub-surface structure, and wear resistance were evaluated using X-ray diffraction, microhardness testing, and nano-indentation. The results indicated that when the Cr content was increased from 0 to 4 wt%, there was a significant increase in the microhardness (H) and elasticity modulus (E) of the cementite. This yielded a 15.91%- and 23.6%-reduction in the degree of wear resistance and surface roughness, respectively. Moreover, no spalling and breaking of cementite was observed with increasing Cr content during the wear process, indicating improved wear resistance of the bulk cementite. In addition, the hard phase (cementite) and tough matrix (pearlite) composite structure exhibited a good protective and supporting effect. Thus, it was concluded that the interaction mechanism of the wear phase contributed to the reduction of the wear weight loss of the composite during the wear process. The contribution of the interaction between the hard wear-resistant phase and the tough phase in WCI to the wear resistance decreased with increasing hardness of the pearlite matrix.

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Three-Body Abrasive Behavior of Cementite–Iron Composite with Different Cementite Volume Fractions

Cited by 20 publications

References 23 publications

Nonequilibrium Molecular Dynamics Investigation of the Reduction in Friction and Wear by Carbon Nanoparticles Between Iron Surfaces

Nonequilibrium Molecular Dynamics Investigation of the Reduction in Friction and Wear by Carbon Nanoparticles Between Iron Surfaces

Mechanical Properties of Cementite

Effect of interaction between cementite and pearlite on two-body abrasive wear behaviors in white cast iron

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