Chapter 8: Austenitization
This chapter focuses on the formation of austenite for a wider range of steels, paying particular attention to the structural changes that occur in higher-carbon steels. It begins with a discussion on the stages involved in the austenitization of eutectoid steels. This is followed by sections describing the processes of austenite transformation in hypoeutectoid and hypereutectoid steels. The transition structures of a steel component associated with local austenitization are then reviewed. The chapter further discusses the processes involved in the determination of the grain size formed during an austenitizing treatment and the grain growth characteristics of coarse- and fine-grained steels. Various factors involved in the refinement of the austenitic grain size of hypoeutectoid and hypereutectoid steels are also covered. The chapter ends with a section providing information on sulfide spheroidization, grain-boundary sulfide precipitation, and grain-boundary liquation associated with overheating and burning of steels.
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