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Indexed by:期刊论文

Date of Publication:2008-10-01

Journal:JOURNAL OF CENTRAL SOUTH UNIVERSITY OF TECHNOLOGY

Included Journals:SCIE、EI、Scopus

Volume:15

Issue:5

Page Number:575-580

ISSN No.:1005-9784

Key Words:GCr15 bearing steel; flow stress; dynamic recystallization; hot deformation

Abstract:The hot deformation behaviors of GCr15 bearing steel were investigated by isothermal compression tests, performed on a Gleeble-3800 thermal-mechanical simulator at temperatures between 950 degrees C and 1 150 degrees C and strain rates between 0.1 and 10 s(-1). The peak stress and peak strain as functions of processing parameters were obtained. The dependence of peak stress on strain rate and temperature obeys a hyperbolic sine equation with a Zener-Hollomon parameter. By regression analysis, in the temperature range of 950-1 150 degrees C and strain rate range of 0.1-10 s(-1), the mean activation energy and the stress exponent were determined to be 351 kJ/mol and 4.728, respectively. Meanwhile, models of flow stress and dynamic recrystallization (DRX) grain size were also established. The model predictions show good agreement with experimental results.