Diffusion chromizing of grey cast iron by reaction with chromium oxide

Gurevich, Yu. G.; Ovsyannikov, V. E.; Frolov, V. A.

doi:10.1007/s11015-012-9513-z

Cited by 2 publications

(2 citation statements)

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“…In a high carbon content substrate, chromium diffusion occurs slowly. Chromium and carbon atoms in the substrate will form a chromium carbide layer at the substrate surface [2][3]. The thickness of the chromium coating layer increases with increasing process time and temperature.…”

Section: Introductionmentioning

confidence: 99%

“…Normally the chromizing process is performed at temperature (above 950°C) with a long process time to ensure the formation of Cr 3 Cl gas which is necessary for the diffusion of chromium. It has been reported that Cr 3 Cl can be formed at high chromizing temperature in a short time process or at a low chromizing temperature in a long time process [3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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Improvement Corrosion Resistance of Gray Cast Iron Grade FC220 on Chromizing Process by Separate Cr Powder and NH<sub>4</sub>Cl Powder System

Chupong

Jornsanoh

Tuchinda

et al. 2015

AMM

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A new configuration of chromizing process was developed by separating Cr powder from NH4Cl. FC220 gray cast iron specimens were chromized in this new experimental setup at 450, 550, 650,750, 850 and 950°C during 13 hours in order to study the possibility of chromizing at “low” temperature. The chromized specimens were examined using Scanning Electron Microscopy (SEM), macro-hardness, micro-hardness, compression test and salt spray test. The results shows that the specimen chromized at 650°C gives the best compromise between the corrosion resistance and the hardness of the FC220 with 1.73 ڌm of thickness of the chromized layer. However, after 13 hours of the process, the hardness of the FC220 specimens decreased considerably from 93 HRB to 64.2 HRB (31%).

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improvement Corrosion Resistance of Gray Cast Iron Grade FC220 on Chromizing Process by Separate Cr Powder and NH<sub>4</sub>Cl Powder System

Chupong

Jornsanoh

Tuchinda

et al. 2015

AMM

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Restoration of the Construction and Road Machines’ Details From Grey Cast Iron: Improvement of the Repair Dimensions’ Method Efficiency

Ovsyannikov

Vasilyev

2019

Vestn. SibADI

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Introduction. The total mass of some grey cast iron details in construction and road machines reaches 60%. Cylinder blocks, parts of braking systems, flywheels, etc. are made of cast-iron. One of the main causes of operational failures (up to 70%) of construction and road machines is failure of friction units. Considering that the contacting parts in these units take the load mainly by surface layers. The operability looses at relatively small values of dimensional wear. Although mass wear of the part usually does not exceed 1%.Materials and methods. The authors carried out a comprehensive technical and economic analysis of repair methods of friction assemblies. As a result, the best combination of criteria was the repair size method. However, the strengthened layer was removed to the repair dimension by conventional reconditioning technology. At the same time grey cast iron was strengthened only by very expensive and labor-intensive methods, which in conditions of real repair production were not applicable. The authors considered the possibility of using a new method of strengthening iron parts in repair works.Results. The developed method strengthened grey cast iron with layer thickness up to 3 mm. The distinctive feature was that hardness of the strengthened layer in thickness increased. At the same time the microhardness increased in comparison with the initial grey iron more than 2 times and wear resistance became comparable to high-strength hardened stun.Discussion and conclusions. The authors obtain the best results with the usage of reducing atmosphere furnaces. In order to expand the scope of the method, the researches proposed to use a special device creating the necessary conditions in any furnace. The application of the proposed technical solutions increases the efficiency of the construction and road machines’ repair.The authors have read and approved the final manuscript. Financial transparency: the authors have no financial interest in the presented materials or methods. There is no conflict of interest.

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Diffusion chromizing of grey cast iron by reaction with chromium oxide

Cited by 2 publications

References 1 publication

Improvement Corrosion Resistance of Gray Cast Iron Grade FC220 on Chromizing Process by Separate Cr Powder and NH<sub>4</sub>Cl Powder System

Improvement Corrosion Resistance of Gray Cast Iron Grade FC220 on Chromizing Process by Separate Cr Powder and NH<sub>4</sub>Cl Powder System

Restoration of the Construction and Road Machines’ Details From Grey Cast Iron: Improvement of the Repair Dimensions’ Method Efficiency

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