An Introduction to Surface Alloying of Metals

Hosmani, Santosh S.; Kuppusami, P.; Goyal, Rajendra Kumar

doi:10.1007/978-81-322-1889-0

Cited by 15 publications

(10 citation statements)

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“…Similar results were also reported by Hosmani et al [36]. Consequently the carbon concentration in the NP delivered by CO disproportionation (Boudouard reaction) should be much higher than that produced by CH 4 decomposition.…”

Section: Controlling Swnt Growth Modes In Fe-based Cvd Synthesissupporting

confidence: 89%

Growth modes and chiral selectivity of single-walled carbon nanotubes

Magnin

Jiang

et al. 2018

Nanoscale

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Chemical vapor deposition synthesis of single-walled carbon nanotubes, using an Fe catalyst, and alternating methane and carbon monoxide as carbon feedstocks, leads to the reversible formation of junctions between tubes of different diameters. Combined with an atomistic modeling of the tube/catalyst interface, this shows that the ratio of diameters of the tube and its seeding particle, denoting the growth mode, depends on the carbon fraction inside the catalyst. With carbon monoxide, nanoparticles are strongly carbon enriched, and tend to dewet the tube, in a perpendicular growth mode. Cross-checking our results with the available reports from the literature of the last decade strongly suggests that these latter conditions should favor the near armchair chiral selectivity observed empirically.

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Section: Controlling Swnt Growth Modes In Fe-based Cvd Synthesissupporting

confidence: 89%

Growth modes and chiral selectivity of single-walled carbon nanotubes

Magnin

Jiang

et al. 2018

Nanoscale

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“…Despite the fact that there are relatively few publications on diffusion layers containing boron and chromium, undoubtedly these chemical elements are worth paying attention in the context of introducing them to steel surface. The boronizing process may have a positive effect on durability improvement of tools for mining as well as for dies or rolls using in metal forming processes (rolling, punching, stamping, or forging) [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34]. Diffusion chrome plating has a number of useful applications, such as increasing durability of tool surfaces in foundry processes and also in plastic forming processes [22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Microstructural and Mechanical Properties of B-Cr Coatings Formed on 145Cr6 Tool Steel by Laser Remelting of Diffusion Borochromized Layer Using Diode Laser

et al. 2021

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The paper presents study results focused on the microstructural, mechanical, and physicochemical properties of B-Cr coatings obtained by means of modification of diffusion borochromized layers by diode laser beam. The studies were conducted on 145Cr6 tool steel. Diffusion borochromized layers were produced at 950 °C in powder mixture containing boron carbides as a source of boron and ferrochrome as a source of chromium. In the next step these layers were remelted using laser beam. Powers: 600, 900, and 1200 W were used during these processes. The microstructure, microhardness, chemical composition, as well as wear and corrosion resistance of newly-formed B-Cr coatings were determined. As a result of laser beam interaction, the diffusion borochromized layer was mixed with the steel substrate. The study showed that too low laser beam power causes cracks in the newly formed B-Cr coating, and on the other hand, too higher laser beam power causes deep remelting resulting in the loss of microhardness. The reduced corrosion resistance in comparison with diffusion borochromized layers was caused by occurrence cracks or deep remelting. For B-Cr coatings produced using laser beam power 600 W, a small decrease in wear resistance was observed, but note that this coating was much thicker than diffusion borochromized layers. On the other hand, laser beam power of 1200 W caused a significant decrease in wear resistance. Newly formed B-Cr coatings had an advantageous microhardness gradient between the layer and the substrate.

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“…For chromized samples, studies have pointed out that there is a carbon-poor layer (hardness lower than the substrate) existing between the Cr coating and steel substrate [11,13,16,17]. Fortunately, it has been reported that these shortcomings can be avoided by duplex coating or composite coating treatments [18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Evolution of the Microstructure and Properties of Pre-Boronized Coatings During Pack-Cementation Chromizing

Zeng

Yang

et al. 2020

Coatings

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The effect of chromizing time on the microstructure and properties of B-Cr duplex-alloyed coating prepared by a two-step pack-cementation process was investigated. The phases, microstructure, and element distribution of three coatings obtained were characterized by X-ray diffraction (XRD), secondary electron imaging (SEI), backscattering electron imaging (BSEI), and energy dispersive spectroscopy (EDS), respectively. The results show that as the chromizing time increases, the net-like Fe2B and rod-like CrFeB phases in the coating gradually disappear, and finally completely transform into the block-like Cr2B and CrxCy (Cr7C3 and Cr23C6) phases. The growth kinetics analysis shows that interface reaction dominates the coating growth during the early stage of chromizing, while atomic diffusion gradually controls the coating growth at the later stage. The evolution mechanism of the B-Cr duplex-alloyed coating was also discussed.

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An Introduction to Surface Alloying of Metals

Cited by 15 publications

References 0 publications

Growth modes and chiral selectivity of single-walled carbon nanotubes

Growth modes and chiral selectivity of single-walled carbon nanotubes

Microstructural and Mechanical Properties of B-Cr Coatings Formed on 145Cr6 Tool Steel by Laser Remelting of Diffusion Borochromized Layer Using Diode Laser

Evolution of the Microstructure and Properties of Pre-Boronized Coatings During Pack-Cementation Chromizing

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