Microstructure evolution and hot deformation behavior of a heavy rail steel

doi:10.13251/j.issn.0254-6051.2020.11.008

Abstract

Abstract: A GGX-G heavy rail steel similar to the BGRE steel was compressively deformed for 30%, 50% and 70% at 850, 900, 930, 950 ℃ respectively by Gleeble-1500D thermal simulation testing machine, and then undergone stepped cooling at different cooling rates. The effects of deformation temperature and deformation amount on the microstructure and pearlite interlamellar spacing of the steel were analyzed by means of OM and SEM. The results show that when the deformation temperature is kept constant (850 ℃ or 900 ℃), the pearlite interlamellar spacing decreases with the increase of deformation amount, which can be refined in the range of 50-80 nm for all the specimens. For the stepped cooling, when the first cooling rate V₁=5 ℃/s, the second cooling rate V₂=2 ℃/s, and holding 3 min at 650 ℃ during the first stepped cooling, the pearlite lamella of the steel is straight and the interlamellar spacing can reach 74.8 nm.

Key words: heavy rail steel, thermal simulation, microstructure, hot deformation

CLC Number:

TG111

Cen Yaodong, Chen Lin, Dong Rui, Bao Xirong, Lou Mengjie. Microstructure evolution and hot deformation behavior of a heavy rail steel[J]. Heat Treatment of Metals, 2020, 45(11): 38-42.

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