Volatility Diagrams for the Cr-O and Cr-Cl Systems: Application to Removal of Cr2O3-Rich Passive Films on Stainless Steel

Hsieh, Man Ching; Ge, Yindong; Kahn, H.; Michal, G. M.; Ernst, F.; Heuer, A. H.

doi:10.1007/s11663-012-9695-6

Cited by 17 publications

(4 citation statements)

References 25 publications

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“…Their parameters are also listed in Table 1. If C 2 H 2 is used as the carbon-containing gas instead of CO, the HCl activation step can be avoided [34]. The application of this technique to simultaneous nitrocarburizing was investigated with two additional treatments, also listed in Table 1, at 430°C (703 K) and 450°C (723 K).…”

Section: Methodsmentioning

confidence: 99%

Diffusion profiles after nitrocarburizing austenitic stainless steel

Kahn

et al. 2015

Surface and Coatings Technology

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Section: Methodsmentioning

confidence: 99%

Diffusion profiles after nitrocarburizing austenitic stainless steel

Kahn

et al. 2015

Surface and Coatings Technology

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“…it can be seen that the corrosion products are mainly composed of two parts, one is the spinel shape products at the bottom, and the other is the fine corrosion products without fixed shape attached to the spinel products. according to the results of the energy spectrum analysis in spinel will be formed on the surface of the sample [27]. the reaction formula is as follows:…”

Section: High Temperature Corrosionmentioning

confidence: 99%

Archives of Metallurgy and Materials

Xue

Luan

Guo

et al. 2021

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Microstructure and ProPerties of tiG surfacinG co-Based alloy on uMco50 Process Burner the surfacing layer of cobalt-based alloy is prepared using the tungsten inert gas welding (tig) process and employing the uMCo50, St1 and St6 filler materials. the metallographic testing, hardness, wear and corrosion testing of different surfacing layers have been carried out. each area of the surfacing layer is characterized using the optical and scanning electron microscope (SeM). Cellular and a few columnar dendrites have been observed near the fusion line of the uMCo50 surfacing layer, and cellular structure is observed in the central region. Dendrites and cellular crystals have been observed in the St1 and St6 surfacing layers. the average hardness of uMCo50, St1 and St6 surfacing layers are 320 HV, 672.3 HV and 497.5 HV, respectively. the wear loss of the St1, St6 and uMCo50 surfacing layer is 2.71 mg, 4.35 mg, and 14.57 mg, respectively. the corrosion weight loss of the St1, St6 and uMCo50 surfacing layers are 0.0388 g, 0.0477 g and 0.0833 g, respectively.

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“…Low-temperature carburization with C 2 H 2 gas has been studied with regard to the influence of change of process temperature and time on the activity and diffusion rate [17,21,22]. In carburization, C 2 H 2 gas even in small amounts causes sufficient reaction for carburization in vacuum, and leads to a decrease in the oxygen partial pressure, so that the natural oxide layer is naturally decomposed [17,22]. Owing to the characteristics of acetylene in the low-temperature regime, carburization in vacuum was proposed to control soot and/or metal dust easily [16].…”

Section: Introductionmentioning

confidence: 99%

Effect of C2H2/H2 Gas Mixture Ratio in Direct Low-Temperature Vacuum Carburization

Song

Kim

et al. 2018

Metals

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The effect of the acetylene and hydrogen gases mixture ratios in direct low-temperature vacuum carburization was investigated. The gas ratio is an important parameter for producing free radicals in carburization. The free radicals can remove the natural oxide film by strong reaction of the hydrocarbons, and then thermodynamic activity can be increased. When the gas ratio was below one, carbon-supersaturated expanded austenite layers were formed on the surface of the AISI 316L stainless steel, which had a maximum carbon solubility up to 11.5 at% at 743 K. On the other hand, when the gas ratio was above one, the carbon concentration of the layers was low even if the process time was increased enough to reach the maximum carbon solubility. As a result, the carbon concentration underneath the surface was determined to be highly dependent on the gas mixture ratio of acetylene and hydrogen. In conclusion, it is necessary to restrict the ratio of acetylene and hydrogen gases in the total mixture of gases to form an expanded austenite layer with high carbon concentration in direct low-temperature vacuum carburization.

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Volatility Diagrams for the Cr-O and Cr-Cl Systems: Application to Removal of Cr2O3-Rich Passive Films on Stainless Steel

Cited by 17 publications

References 25 publications

Diffusion profiles after nitrocarburizing austenitic stainless steel

Diffusion profiles after nitrocarburizing austenitic stainless steel

Archives of Metallurgy and Materials

Effect of C2H2/H2 Gas Mixture Ratio in Direct Low-Temperature Vacuum Carburization

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