Experiments and calculations on refining mechanism of NbC on primary M7C3 carbide in hypereutectic Fe-Cr-C alloy

Liu, Sha; Wang, Zhijie; Shi, Zhijun; Zhou, Yefei; Yang, Qingxiang

doi:10.1016/j.jallcom.2017.04.167

Cited by 54 publications

(17 citation statements)

References 31 publications

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“…All four type YAlO3(001) models are polar surface models, and the surface energy can be calculated by equation as follow: (6), the equation of the surface energy YAlO3(001) of YAlO3(001) Y-terminated model with only one variate Y is shown as follows: (7) In YAlO3(001) O1-terminated surface model, the number of atoms satisfies the following equation: (8) By combining equation (4), equation (5) and equation (8), the equation of the surface energy YAlO3(001) of YAlO3(001) O1-terminated model can be simplified as follows: (9) In YAlO3(001) O2-terminated surface model, the number of atoms satisfies the following equation:…”

Section: Surface Energy Of Yalo3mentioning

confidence: 99%

“…Zhang et al [8] researched the refinement mechanism of NbC on TiN, which reveals that NbC heterogeneous nucleation on TiC preferentially occurs on the (1 1 1) surface. Liu et al [9] investigated the refinement mechanism of NbC on primary M7C3 carbides in hypereutectic Fe-Cr-C alloy, in which the experimental and computational results demonstrate that NbC particle is the heterogeneous nucleus of primary M7C3 carbide and thereby refines it. The researches [10,11] indicate that the refinement effect of NbC is related with its size closely, and the smaller its size is, the better the refinement is.…”

Section: Introductionmentioning

confidence: 99%

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Structure and properties of YAlO3/NbC heterogeneous nucleation interface: First principles calculation and experimental research

Shi

Liu

Zhou

et al. 2019

Journal of Alloys and Compounds

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Structure and properties of YAlO3/NbC heterogeneous nucleation interface: First principles calculation and experimental research http://researchonline.ljmu.ac.uk/id/eprint/9834/ Article LJMU has developed LJMU Research Online for users to access the research output of the University more effectively. , Q (2018) Structure and properties of YAlO3/NbC heterogeneous nucleation interface: First principles calculation and experimental research. Journal of Alloys and Compounds, 773. pp. AbstractThe characteristics of YAlO3/NbC heterogeneous nucleation interface are strongly associated with the interfacial structure, electronic construction and properties. The lattice mismatch between low index crystal faces of YAlO3 and NbC was calculated by using the Bramfitt twodimensional lattice mismatch theory. The work of adhesion, interfacial energy and electronic structure of the YAlO3(001)/NbC(100) interface structures were calculated by the first principles method. The charge density difference, electron localization function and crystal orbits overlap population were adopted to analyze the charge transfer and bond characteristics. The microstructure of surfacing alloy was observed by transmission electron microscopy (TEM). The results show that, the two-dimensional lattice mismatch of YAlO3(001)-NbC (100) interface is 5.4%, which testifies that YAlO3 can meet the lattice structure condition of being an effective heterogeneous nucleus of NbC. In all interface structures, the work of adhesion of C-O2 model is the largest (Wad=6.558 J/m 2 ) and the interfacial energy of C-Y model is the smallest (=0.54J/m 2 ). It can be confirmed that the C-Y interface structure is the most stable one, whose interfacial energy is the smallest. The chemical bonds between interface atoms of all models are major covalent bonds and few metal bonds. The calculation results indicate that YAlO3(001) slab and NbC(100) slab can form a stable interface structure. The TEM results verify that the rare earth compound in NbC particle is YAlO3. In addition, NbC growth encircling YAlO3 and they are combined tightly. Therefore, YAlO3 can act as the effective heterogeneous nucleus of NbC and refine it.

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Section: Surface Energy Of Yalo3mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Structure and properties of YAlO3/NbC heterogeneous nucleation interface: First principles calculation and experimental research

Shi

Liu

Zhou

et al. 2019

Journal of Alloys and Compounds

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“…Niobium can also form niobium carbide as a heterogeneous nucleation point, thereby reducing the size of the primary carbide, and the shape becomes regular [6,7]. It is theoretically proved that niobium carbide can be used as a heterogeneous nucleation point with molecular dynamics methods [8,9]. Adding Ti first and then Niobium can form a titanium carbide-niobium carbide core-shell structure, which can refine the primary carbide from 76 μm to 11 μm.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and properties of modified as‐cast hypereutectic high chromium cast iron

Guo

et al. 2022

Materialwissenschaft Werkst

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The present work studied the effects of different modification treatments on the microstructure and mechanical properties of hypereutectic high chromium cast iron containing about 35 wt% chromium and 4.0 wt% carbon. It was found that the primary carbides in the hypereutectic high chromium cast iron were all refined to different levels after different modification treatments. Among them, the best result was obtained by adding 0.6 wt % rare earth magnesium, and its average carbide diameters was 43 μm, which is almost half of the unmodified specimen. After modification, the mechanical properties have been improved, and the refinement of primary carbides can greatly improve its impact toughness. The impact toughness of the specimen modified by adding 0.6 wt % rare earth magnesium was the largest, reaching 7.0 J cm−2, and the impact toughness of un‐modification specimen was the worst, only 4.5 J cm−2. The refining of primary carbides does not have much effect on the hardness. The hardness of the sample with 0.6 wt % rare earth magnesium and 0.3 wt % TiBAl is the highest, and its value is 58.0 HRC. The wear resistance increases with the refinement of primary carbides.

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“…Liu et al [19] determined that the sizes of the primary M 7 C 3 carbides in the hypereutectic Fe-Cr-C hardface coating were refined from 30 to 15 μm with a Ti additive. Furthermore, Liu et al [20] investigated the effect of an Nb additive in M 7 C 3 carbides in the hypereutectic Fe-Cr-C hardface coating and found that the primary M 7 C 3 carbides in the hypereutectic Fe-Cr-C hardface coating could be refined from 30-50 to 20 μm by the addition of 1.2 wt-% Nb. This indicates that Ti and Nb additives can effectively re fi ne the primary M 7 C 3 carbides in hypereutectic Fe-Cr-C hardface coating s. With the rapid development of ad ditive manufacturing technology, hypereutectic Fe-Cr-C hardface coating s with long service lives are essential, and the M 7 C 3 carbides in the coatings must be further refined [21,22].…”

Section: Introductionmentioning

confidence: 99%

Refining effect of nitrogen on M₇C₃ carbides in hypereutectic Fe–25Cr–4C–0.5Ti–0.5Nb hardface coatings

Wang

Xing

Zhou

et al. 2019

Materials Science and Technology

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Hypereutectic Fe–Cr–C–Ti–Nb coatings with N additives were developed by surface-hardening welding (hardfacing). The experimental results showed that the primary M7C3 carbides were refined by the N additives in the coatings. Based on the micro-morphologies of M7C3 and (Ti,Nb)(C,N), the (Ti,Nb)(C,N) was present inside the primary M7C3 carbides, and they were tightly combined. The mismatch between the (010) crystal plane of M7C3 and the (110) crystal plane of (Ti,Nb)(C,N) was 6.15%, which indicated that (Ti,Nb)(C,N) was moderately effective as a heterogeneous nucleus of M7C3 carbides. Therefore, the preferentially precipitated (Ti,Nb)(C,N) in the Fe–Cr–C–Ti–Nb coating was the heterogeneous nucleus of the primary M7C3 carbides and thereby refined the primary M7C3 carbides.

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Experiments and calculations on refining mechanism of NbC on primary M7C3 carbide in hypereutectic Fe-Cr-C alloy

Cited by 54 publications

References 31 publications

Structure and properties of YAlO3/NbC heterogeneous nucleation interface: First principles calculation and experimental research

Structure and properties of YAlO3/NbC heterogeneous nucleation interface: First principles calculation and experimental research

Microstructure and properties of modified as‐cast hypereutectic high chromium cast iron

Refining effect of nitrogen on M₇C₃ carbides in hypereutectic Fe–25Cr–4C–0.5Ti–0.5Nb hardface coatings

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Experiments and calculations on refining mechanism of NbC on primary M7C3 carbide in hypereutectic Fe-Cr-C alloy

Cited by 54 publications

References 31 publications

Structure and properties of YAlO3/NbC heterogeneous nucleation interface: First principles calculation and experimental research

Structure and properties of YAlO3/NbC heterogeneous nucleation interface: First principles calculation and experimental research

Microstructure and properties of modified as‐cast hypereutectic high chromium cast iron

Refining effect of nitrogen on M7C3 carbides in hypereutectic Fe–25Cr–4C–0.5Ti–0.5Nb hardface coatings

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Refining effect of nitrogen on M₇C₃ carbides in hypereutectic Fe–25Cr–4C–0.5Ti–0.5Nb hardface coatings