Wear resistance of hypereutectic Fe–Cr–C hardfacing coatings with <i>in situ</i> formed TiC

Zhou, Yefei; Yang, Yong; Yang, Jinfeng; Zhang, P F; Qi, Xiaowen; Ren, Xuejun; Yang, Qingxiang

doi:10.1179/1743294413y.0000000120

Cited by 12 publications

(1 citation statement)

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“…Katılaşma sürecinde MC fazı sıvı fazdan 1570 °C' de çökelir. Sıcaklığın azalmaya devam etmesiyle 1297 °C' de Fe ve Cr elementlerince zengin M7C3 karbürleri çökelmeye devam eder[27]. Son aşamada ise az miktarda alaşım atomu içeren sıvı faz, -(Fe,Cr) ile ötektik yapı oluşturarak katılaşma sonlanır.…”

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TIG yöntemiyle üretilen Fe-Cr-C/M(Nb,Ti)C kompozit kaplamalarında mikroyapısal Değişimler

Buytoz

2020

Gazi Üniversitesi Fen Bilimleri Dergisi Part C: Tasarım Ve Teknoloji

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In this study, Fe-Cr-C, Fe-Cr-C/FeNb and Fe-Cr-C/TiC powders were coated on the surface of AISI4140 steel with TIG method. Phase structures and morphological properties of the coating layers were investigated by optical microscope, scanning electron microscopy and X-Ray diffractometer. The test results show that the coating layer is solidified hexagonal-shaped M7C3, TiC and NbC carbides in -(Fe,Cr) eutectic matrix. Figure A. Schema of the TIG coatingPurpose: In this study, Fe-Cr-C, Fe-Cr-C/FeNb and Fe-Cr-C/TiC powders were coated on the surface of medium-carbon steel substrate with TIG process and characterized. After that the microstructural properties of the coated layers were investigated by optical microscope, scanning electron microscopy and X-Ray diffractometer, respectively.Theory and Methods: In present study, TIG weld torch was used for coating. At first stage, Fe-Cr-C, Fe-Cr-C/FeNb and Fe-Cr-C/TiC powders were mixed with powder mixing apparatus and pre-placed on AISI4140 steel substrate. At second stage, substrate surfaces were scanned with TIG torch in the suitable scanning speed and heat input. After coating processes, the coated layers were investigated by optic microscopy, scanning electron microscopy and X-Ray diffractometer, respectively. Results:The surface appearance of all coating layers is uniform due to the suitable scanning speed and heat input and do not shows a superficial crack formation. According to the XRD results, primary phase is -(Fe,Cr) and secondary phase M7C3 carbide in FeCrC coating. At the same time, NbC phases were detected in FeNb coating and TiC phases were found in TiC coating. Conclusion:In this study, Fe-Cr-C, Fe-Cr-C/FeNb and Fe-Cr-C/TiC powders were coated by TIG method on the surface of AISI4140 steel substrate and microstructural change of the coating was investigated. It was seen that the coating is metallurgically bonded to the substrate when it is produced with sufficient energy input. While Fe-Cr-C/FeNb and Fe-Cr-C/TiC coatings consists of quadrangular-shaped NbC carbides and triangel-shaped TiC carbides, hexagonal-shaped M7C3 carbides solidified in -(Fe,Cr) eutectic matrix for the FeCrC coatings.

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