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|標題:||Effect of carbon content on microstructural characteristics of the hypereutectic Fe-Cr-C claddings||作者:||Chang, C.M.
|關鍵字:||Carbide;Welding;Microstructure;Hardness;white cast-iron;hardfacing alloys;liquidus surface;wear behavior;resistance;stability;carbides;steel||Project:||Materials Chemistry and Physics||期刊/報告no：:||Materials Chemistry and Physics, Volume 117, Issue 1, Page(s) 257-261.||摘要:||
The hypereutectic Fe-Cr-C claddings with different C contents were deposited on ASTM A36 steel substrates by flux cored arc welding (FCAW) to investigate that the effect of C content on microstructural characteristics. The results showed that the microstructure of hypereutectic Fe-Cr-C claddings consisted of primary proeutectic (Cr,Fe)(7)C(3) and the austenite plus (Cr,Fe)(7)C(3) eutectic. Proeutectic carbides undergone to several microstructural changes in response to higher carbon content in the cladding. The morphologies of proeutectic (Cr,Fe)(7)C(3) carbides changed from blade-like to rod-like with hexagonal cross section. The amounts of proeutectic (Cr,Fe)(7)C(3) carbides increased with increase of the C contents. The nucleation sites of proeutectic (Cr,Fe)(7)C(3) carbides increased under high undercooling condition. Hence, the latent heat of solidification can be released by formed proeutectic (CrFe)(7)C(3) carbides and then the growth of proeutectic (CrFe)(7)C(3) carbides were suppressed. Consequently, it showed a maximum hardness value (about HRC 62) when the amount of proeutectic (Cr,Fe)(7)C(3) carbides exceeded 86%. (c) 2009 Elsevier B.V. All rights reserved.
|Appears in Collections:||材料科學與工程學系|
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