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The transformation of austenite of cast irons represents a more complex and less studied subject. This article discusses the general features of the decomposition of austenite into bainite. It describes the heat treatment cycles of austempered cast iron microstructure. The article reviews several factors, such as presence of graphite and austenite grain size, which affect the transformation rate of austenite during austempering of free-graphite cast irons.

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Robert Boeri, The Austenite-to-Ausferrite Transformation, Cast Iron Science and Technology, Vol 1A, ASM Handbook, Edited By Doru M. Stefanescu, ASM International, 2017, p 114–118,

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