Microstructural characteristics of gas tungsten arc synthesised Fe-Cr-Si-Ccoating

Date

2002-10-01

Author

Yılmaz, Osman
Özenbaş, Ahmet Macit

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

100
views

0
downloads

The gas tungsten arc (GTA) method was used to synthesise Fe - Cr - Si - C alloy coatings, and processing effects on the coating were investigated experimentally. Coatings were developed on an AISI type 1040 steel substrate. Four different regions were obtained in the surface coating; and in these regions either a hypoeutectic or a hypereutectic microstructure was found. The hypoeutectic microstructure consisted of primary dendrites of austenite (gamma) phase and eutectic M7C3 (M = Cr,Fe) carbides. On the other hand, the hypereutectic microstructure consisted of M7C3 primary carbides and eutectic. A hypoeutectic or hypereutectic microstructure was determined by the combination of particularly carbon concentration, solidification rate, and extent of substrate melting. The higher hardness of the hypereutectic microstructure is attributed especially to the formation Of M7C3 primary carbides. The lower hardness of the hypoeutectic microstructure is related to three effective parameters: first, the presence of, gamma phase in the primary dendrites; second, excessive dilution from the base material; and third, relatively low concentrations of chromium and carbon.

Subject Keywords

White cast-iron, Coatings

URI

https://hdl.handle.net/11511/62733

Journal

MATERIALS SCIENCE AND TECHNOLOGY

DOI

https://doi.org/10.1179/026708302225005891

Collections

Department of Physics, Article

Suggestions

OpenMETU
Core

Microstructure characteristics in Al-C system after mechanical alloying and high temperature treatment BOSTAN, B; Özdemir, Ataman; Kalkanlı, Ali (2004-03-01) In this work elemental powders of Al and 2 wt-% graphite were mechanically alloyed in a high energy horizontal attritor under purified argon atmosphere for 0.5-2 h. Powder mixes were then cold pressed at 1200 MPa and sintered at 550degreesC for between 2-32 It under the same protective atmosphere. Structural evolution was characterised by X-ray diffraction, scanning electron microscopy and transmission electron microscopy techniques. Results revealed that mechanical alloying was very effective in pulverisin...
Effect of surface treatment on electrical conductivity of carbon black filled conductive polymer composites Koysuren, Ozcan; Yesil, Sertan; Bayram, Göknur (Wiley, 2007-06-05) Two different types of surface modifiers, 3-aminopropyltriethoxysilane and formamide, were applied to carbon black (CB) particles to lower electrical resistivity of polymer composites prepared by treated CB. Two different matrices, low-density polyethylene and nylon 6, were chosen to compound with surface modified CB. Surface energy of CB was increased by adding amine or amide functional groups during surface treatment of CB. According to electron spectroscopy for chemical analysis (ESCA), chemical modifica...
Microstructural investigation of Cu2+ doped nanohydroxyapatites Evis, Zafer (Informa UK Limited, 2010-05-01) Pure and Cu2+ doped nanohydroxyapatites were synthesised by a precipitation method to investigate the effect of Cu2+ ions on the structure of hydroxyapatite (HA) and its thermal stability after the air sintering at 1100 degrees C. A small amount of CaO was observed in the Cu2+ doped HAs after the X-ray diffraction results. The addition of Cu2+ changed the hexagonal lattice parameters of the HA and resulted in smaller grain size after sintering at 1100 degrees C. The addition of Cu2+ ions into HA resulted in...
Effect of expandable graphite on flame retardant, thermal and mechanical properties of thermoplastic polyurethane composites filled with huntite&hydromagnesite mineral Guler, Turkan; Tayfun, Umit; Bayramlı, Erdal; DOĞAN, Mehmet (2017-01-10) The effect of expandable graphite (EG) was studied on the flame retardant, thermal and mechanical properties of thermoplastic polyurethane (TPU) containing huntite&hydromagnesite (HH). According to the flammability tests results, the synergistic interaction was observed between HH and EG. The maximum limiting oxygen index (LOI value was observed at a ratio of 1:1 (HH:EG) and the highest vertical burning test (UL-94) rating of V0 was observed at a ratios of 4:1, 3:2 and 1:1. The synergistic interaction betwe...
Microstructural changes and void swelling of a 12Cr ODS ferritic-martensitic alloy after high-dpa self-ion irradiation Chen, Tianyi; Aydoğan Güngör, Eda; Gigax, Jonathan G.; Chen, Di; Wang, Jing; Wang, Xuemei; Ukai, S.; Garner, F. A.; Shao, Lin (2015-12-01) A dual-phase 12Cr oxide-dispersion-strengthened (ODS) alloy, with improved corrosion and oxidation resistance exhibits promising void swelling resistance and microstructural stability under Fe2+ ion irradiation to 800 dpa at 475 degrees C. Dispersoids were originally present in both ferrite and tempered martensite grains, with the latter having a wider range of dispersoid sizes. In both phases dispersoids > 10 nm in diameter are incoherent with the matrix, while smaller dispersoids are coherent. During irra...

Citation Formats

O. Yılmaz and A. M. Özenbaş, “Microstructural characteristics of gas tungsten arc synthesised Fe-Cr-Si-Ccoating,” MATERIALS SCIENCE AND TECHNOLOGY, pp. 1209–1216, 2002, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/62733.