Metallurgical and Materials Transactions A

, Volume 39, Issue 3, pp 624–635

Microstructure Evolution of a Pearlitic Steel during Hot Deformation of Undercooled Austenite and Subsequent Annealing

Article

DOI: 10.1007/s11661-007-9447-4

Cite this article as:
Li, L., Yang, W. & Sun, Z. Metall and Mat Trans A (2008) 39: 624. doi:10.1007/s11661-007-9447-4

Abstract

Microstructure evolution of a pearlitic steel (0.81 mass pct C) during hot compression of undercooled austenite and subsequent annealing was studied by means of field-emission scanning electron microscopy, electron backscattered diffraction (EBSD), and transmission electron microscopy (TEM). The experiments were performed at 923 K, between A1 and Ar1, at strain rates of 0.01 to 1 s−1. Compared with the isothermal transformation and the spheroidizing annealing, the transformation of undercooled austenite and the spheroidization of pearlite were accelerated by hot deformation, leading to the formation of the microduplex structures that consisted of ultrafine ferrite grains with average size smaller than 1 μm and spheroidized cementite particles with average size smaller than 0.3 μm during hot deformation and subsequent annealing.

Copyright information

© The Minerals, Metals & Materials Society and ASM International 2008

Authors and Affiliations

  1. 1.State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijingP.R. China
  2. 2.School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijingP.R. China

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