Effects of TIG Surface Melting and Chromium Surface Alloying on Microstructure, Hardness and Wear Resistance of ADI
作者： A Amirsadeghi , M Heydarzadeh Sohi , S F Kashani Bozorg
DOI: 10.1016/S1006-706X(08)60150-8
关键词: Austenite 、 Metallurgy 、 Ductile iron 、 Materials science 、 Austempering 、 Indentation hardness 、 Eutectic system 、 Microstructure 、 Chromium 、 Martensite
摘要: Microhardness and wear resistance of different microstructures formed by TIG (tungsten inert gas) surface melting chromium alloying (using ferrochromium) ADI (austempered ductile iron) were studied. Surface resulted in the formation a ledeburitic structure melted zone, this has hardness up to 896 HV as compared 360 that ADI. Moreover, structures including: (1) hypereutectic consisting primary (Fe,Cr)7C3 carbides eutectic matrix transformed austenite (into martensite retained austenite) , also carbides, with 1078 HV; (2) hypoeutectic same along austenite, 755 (3) an acicular morphology HV. The results indicated reduced rate approximately 37%. Also, yielded superior behavior treated specimens about 38% 70%, depending on formed.
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