Microstructural Evolution of Hypoeutectic, Near-Eutectic, and Hypereutectic High-Carbon Cr-Based Hard-Facing Alloys

Lin, Chi-Ming; Chang, Chia‐Ming; Chen, Jiehao; Hsieh, Chih-Chun; Wu, Weite

doi:10.1007/s11661-009-9784-6

Cited by 29 publications

(11 citation statements)

References 19 publications

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“…The primary carbides are polygonal and some are needle shaped depending on the direction of solidification. The primary and eutectic carbides are of the type M 7 C 3 and M 23 C 6 , respectively [18][19][20][21][22][23][24]. Figure 2 shows the microstructure of alloy 2 sample.…”

Section: Experimental Methodsmentioning

confidence: 99%

Corrosion Behaviour of High-Chromium White Iron Hardfacing Alloys in an Alkaline Solution

Marimuthu

Kannoorpatti

2016

J Bio Tribo Corros

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Hardfacing alloys of high-chromium white irons (HCWI) deposited using welding are well known for their wear resistance. These materials are applied in conditions needing not only wear resistance but also corrosion. In this study, the HCWI alloys were exposed to alkaline solutions of pH 14. Anodic polarization technique was used to study the corrosion behaviour. The experimental results found that corrosion occurs on carbides in preference to the matrix. Pourbaix diagrams of carbides were found to be very useful in explaining the corrosion behaviour of the hardfacing alloys. The significance of carbide corrosion to the use of hardfacing alloys is discussed. Possible methods to mitigate corrosion are proposed.

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Section: Experimental Methodsmentioning

confidence: 99%

Corrosion Behaviour of High-Chromium White Iron Hardfacing Alloys in an Alkaline Solution

Marimuthu

Kannoorpatti

2016

J Bio Tribo Corros

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“…7. However, in pH 2 solution corrosion in eutectic carbides rather than primary carbides occurred probably due to eutectic carbides generally being Cr 23 C 6 carbides where the primary carbides are Cr 7 C 3 [15,[33][34][35][36][37][38]. The stability of Cr 23 C 6 eutectic carbides was less stable than Cr 7 C 3 primary carbides as described in the literature [27] of Pourbaix diagrams of chromium carbides.…”

Section: Stability Of Passive Formation Of Matrix and Pourbaix Diagramsmentioning

confidence: 83%

“…The primary and eutectic carbides are of the type M 7 C 3 and M 23 C 6 , respectively. The M 7 C 3 carbides were considered to be more stable than M 23 C 6 carbides [15,[33][34][35][36][37][38]. Figure 2 shows the microstructure of alloy 2 sample.…”

Section: Methodsmentioning

confidence: 99%

Corrosion Behaviour of High Chromium White Iron Hardfacing Alloys in Acidic and Neutral Solutions

Marimuthu

Kannoorpatti

2016

J Bio Tribo Corros

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Hardfacing alloys of High Chromium White Irons (HCWI) were deposited on low carbon steel using Shielded Metal Arc Welding. Microstructure of HCWI consists of primary carbides, eutectic carbides and eutectic austenitic/martensitic matrix. This study investigated the corrosion behaviour of HCWI in both acid and neutral solutions. The corrosion behaviour of HCWI was evaluated using anodic polarisation technique. It was found that in acid solution at pH 1.5, corrosion occurs on eutectic austenite/martensitic matrix whereas at pH 2, the corrosion occurs on eutectic carbides. In the neutral environment at pH 7, corrosion of HCWI occurred in the eutectic austenite/martensite matrix in the presence of chloride ions, while in the buffered solution, corrosion occurred in the carbides. The results of this study show that the corrosion mechanism of HCWI for both acid and neutral environments was due to potential difference between carbides and eutectic austenite/martensitic matrix. The superimposed Pourbaix diagrams of chromium carbides with iron (Fe) and niobium carbide were useful in explaining the behaviour of HCWI in both acid and neutral solutions.

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“…As one of the advanced technologies, not only can the hardfacing coating with high hardness be obtained, but also the metallurgical bonding between the coating and substrate is strong [4,5]. Among the hardfacing coatings, the hypereutectic Fe-Cr-C coatings with the low cost and superior wear resistance have been extensively applied such as grinding, milling and pumping apparatus in these low-stress abrasion conditions [6,7].…”

Section: Introductionmentioning

confidence: 99%

Influence of Nano-Y2O3 on Wear Resistance of Hypereutectic Fe–Cr–C Hardfacing Coating

et al. 2015

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The aim of this study was the investigation of the effect of different Y 2 O 3 additives on wear resistance of the hypereutectic Fe-Cr-C hardfacing coatings. The microstructures were observed by optical microscopy, field emission scanning electron microscopy and transmission electron microscopy, respectively. Meanwhile, the hardness was measured and the wear resistance was evaluated. Finally, the role of Y 2 O 3 was discussed. The microstructures of the coatings consist of the primary (Cr, Fe) 7 C 3 carbide and eutectic structure [austenite ? (Cr, Fe) 7 C 3 carbide]. Moreover, Y 2 O 3 can refine the M 7 C 3 carbide and improve the wear resistance of coatings obviously. Y 2 O 3 can absorb at the surface of the M 7 C 3 carbide and improve the wear resistance of the hypereutectic Fe-Cr-C hardfacing coatings.

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Microstructural Evolution of Hypoeutectic, Near-Eutectic, and Hypereutectic High-Carbon Cr-Based Hard-Facing Alloys

Cited by 29 publications

References 19 publications

Corrosion Behaviour of High-Chromium White Iron Hardfacing Alloys in an Alkaline Solution

Corrosion Behaviour of High-Chromium White Iron Hardfacing Alloys in an Alkaline Solution

Corrosion Behaviour of High Chromium White Iron Hardfacing Alloys in Acidic and Neutral Solutions

Influence of Nano-Y2O3 on Wear Resistance of Hypereutectic Fe–Cr–C Hardfacing Coating

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