Isothermal Grain Growth of Austenite in Hypoeutectoid and Hypereutectoid Plain Carbon Steels

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Abstract Grain growth kinetics of austenite in a hypoeutectoid steel (containing 0.35 wt% carbon) at 920��C and in a hypereutectoid steel (containing 1 wt% carbon) at 980��C has been investigated with holding time ranging from 1 h to 6 h. The hypoeutectoid steel exhibited normal grain growth without solute drag hindrance with a time exponent (0.51) close to the theoretical value (0.5). However, grain growth of austenite in hypereutectoid steel was extremely slow up to 3 h of holding characterized by a low value of time exponent (0.06). Thereafter, a breakaway occurred and the grain growth in hypereutectoid steel from 3 h to 6 h of holding progressed normally with a time exponent (0.55) close to the theoretical value (0.5).

Key words�� plain carbon steel grain growth time exponent solute drag

Received: 07 September 2009

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	Joydeep Maity
	Dipak Kumar Mondal

Cite this article:

Joydeep Maity,Dipak Kumar Mondal. Isothermal Grain Growth of Austenite in Hypoeutectoid and Hypereutectoid Plain Carbon Steels[J]. Chinese Journal of Iron and Steel, 2010, 17(7): 38-43.

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http://gt.chinamet.cn/Jweb_gtyjxb_en/EN/ OR http://gt.chinamet.cn/Jweb_gtyjxb_en/EN/Y2010/V17/I7/38