Microstructure Evolution of medium carbon steel during deformation of undercooled austenite

Acta Metall Sin

2007, Vol. 42

Issue (1): 27-34 DOI:

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Microstructure Evolution of medium carbon steel during deformation of undercooled austenite

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北京科技大学

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;. Microstructure Evolution of medium carbon steel during deformation of undercooled austenite. Acta Metall Sin, 2007, 42(1): 27-34 .

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Abstract The microstructure evolution of a medium carbon steel (0.48%C) during deformation of undercooled austenite at different deformation temperature and strain rate has been investigated by means of uniaxial hot compression simulation experiment. The predominant mechanism on the formation of ultrafine (冄+冡) microduplex structures has been studied in medium carbon steel The experimental results showed that the process of microstructure development can be divided into three stages: dynamic ferrite transformation, dynamic pearlite transformation and spheroidization of lamellae pearlite. And the effects of deformation temperature and strain rate on the process of dynamic transformation and spheroidization of pearlite were different. A large number of vacanies and high density dislocations introduced during large strain hot deformation provided short-circuiting paths for diffusion of carbon atoms, as a result the rate of cementite spheroidization was accelerated by four orders of magnitude through deformation of undercooled austenite as compared to a static annealing treatment. The redistribution of cementite particles in the ferrite matrix has been observerd, which can be interpreted in terms of dissolution-reprecipitation mechanism.

Key words: medium carbon steel dynamic transformation spheroidization of pearlite diffusion of carbon atoms

Received: 17 April 2006

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