Microhardness of cementite

Taran, Yu. N.; Novik, V. I.

doi:10.1007/bf00713813

Cited by 9 publications

(5 citation statements)

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“…This effect is largely due to the much higher microhardness of VC (2600-3000 HV) 25 than of cementite (840-1250 HV). 26 Similar conclusions about the critical role VC particles play in wear resistance have been reported for high speed steel 25,27 and cast steel. 28 In summary, the carbides in Ni-Cr alloyed cast iron were significantly refined by V alloying, and the hardness and wear resistance of the cast iron have been increased considerably.…”

Section: Hardness and Wear Resistancesupporting

confidence: 72%

Effect of vanadium on microstructure and wear resistance of Ni–Cr alloyed cast iron

Xiao

Wang

et al. 2013

International Journal of Cast Metals Research

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The effect of vanadium content on the microstructure of Ni-Cr alloyed cast iron has been investigated by optical and scanning electronic microscopy and differential scanning calorimetry, aided by thermodynamic calculations of the phase diagrams. The wear resistance of cast and tempered specimens was examined in pin on disc tests. The results show that with increasing V additions, the number of vanadium carbide (VC) precipitates was greatly enhanced and the distribution of precipitates became more uniform. Furthermore, refinement of M 3 C precipitates (M5Fe, Cr, Ni, Mo, V) increased with V addition as a result of heterogeneous nucleation at VC particles. An increase in V content from 0?85 to 4?58 wt-% improved the wear resistance of the cast iron significantly, by a factor of almost 13. Analysis of the microstructure suggests that the refinement of M 3 C and the uniform distribution of dense VC particles account for the improvement of wear resistance of the cast iron. 6 Equilibrium phase mass fraction of Ni-Cr alloyed cast iron with V content of a V1, b V2, c V3 and d V5 calculated by Thermol-Cal software Wu et al. Effect of V on microstructure of Ni-Cr cast iron

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Section: Hardness and Wear Resistancesupporting

confidence: 72%

Effect of vanadium on microstructure and wear resistance of Ni–Cr alloyed cast iron

Xiao

Wang

et al. 2013

International Journal of Cast Metals Research

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“…Experiments using such samples include the measurement of lattice parameters by X-ray diffraction, [7][8][9][10][11][12] synchrotron radiation X-ray diffraction, 13) neutron diffraction, 14,15) the measurement of thermal expansion coefficients, 10,11,[13][14][15] and measurements of X-ray elastic constants. [16][17][18] In addition, hardness measurement [19][20][21][22][23][24][25][26][27] and the measurement of Young's modulus by nanoindentation 27,28) were also performed using such samples. The second type involved the use of various samples with different volume fractions of cementite.…”

Section: Samples Used To Study the Physical Properties Of Cementitementioning

confidence: 99%

“…The hardness values of pure cementite samples at room temperature reported after 1950 are summarized in Table 5. [19][20][21][22][23][24][25][26] Vickers hardness measurements were performed for the primary cementite in white cast iron and single-phase samples prepared using MA and SPS. Table 5 shows that the hardness of pure cementite at room temperature is in the range 1 013-1 340 HV.…”

Section: Hardness Of Cementitementioning

confidence: 99%

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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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“…The hardness values may be underestimates due to some porosity in the samples. (b) Ambient temperature microhardness data for cementite within a cast iron microstructure [139,140] and from plasma deposited Fe C [110]. The chemical compositions indicated are in wt-% and represent measurements on cementite alone. …”

Section: Strength Ductility Toughness and Wearmentioning

confidence: 99%

Cementite

Bhadeshia

2019

International Materials Reviews

106

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Cementite occurs in steels, in meteorites, possibly at the core of the Earth and has uses in its pure form. It's composition can deviate from Fe 3 C, but not by much because the Fe-C bond contributes to its cohesion. Its crystallographic unit cell is orthorhombic and primitive, with large lattice parameters, explaining its hardness. Many of its properties are anisotropic. Its single-crystal elastic properties have been investigated using first-principles calculations and by clever experiments. The iron atoms in the cell occupy two types of positions with different point symmetries; the four carbon atoms lodge within prismatic interstices. The structure can develop defects such as dislocations, faults and vacancies. Cementite is metallic and ferromagnetic with a Curie temperature of about 187 • C. When alloyed, metallic solutes substitute on to the iron sites; smaller atoms such as boron replace carbon at interstitial sites. This review focuses on cementite as a single phase.

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Microhardness of cementite

Cited by 9 publications

References 0 publications

Effect of vanadium on microstructure and wear resistance of Ni–Cr alloyed cast iron

Effect of vanadium on microstructure and wear resistance of Ni–Cr alloyed cast iron

Mechanical Properties of Cementite

Cementite

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