Hot ductility of brake disc CrMoV steel for high speed railway

doi:10.13251/j.issn.0254-6051.2021.01.037

Abstract

Abstract: Hot ductility tests of brake disc CrMoV steel for high speed railway were carried out at temperatures between 600-1350 ℃ by a Gleeble-3800 thermal simulator,the fracture morphology was observed by means of scanning electron microscopy and the microstructure section fracture was observed by optical microscope.The results show that there are three brittle temperature zones for the experimental steel in the range of 600-1350 ℃,Ⅰ brittle zone is from melting point to 1320 ℃,Ⅱ brittle zone 1100-1000 ℃ and Ⅲ brittle zone 800-650 ℃.In the Ⅱ brittle zone,precipitates of V(C,N) and VN at grain boundary is the main cause of deterioration in ductility.It is imperative to avoid those zones when drawing up the rolling schedules.

Key words: brake disc, hot ductility, fracture morphology, brittle zone

CLC Number:

TG142.1

Wang Chengming, An Zhiguo, Sun Xiaoran, Sun Yan, Hai Yan. Hot ductility of brake disc CrMoV steel for high speed railway[J]. Heat Treatment of Metals, 2021, 46(1): 204-208.

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