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所属单位：材料科学与技术学院

发表刊物：HIGH TEMPERATURE MATERIALS AND PROCESSES

关键字：dynamic recrystallization behavior vanadium microalloyed cryogenic fine grain structural steel pipe high strain rate

摘要：Dynamic recrystallization (DRX) behavior of a vanadium microalloyed steel pipe was systematically investigated at temperatures range of 850-1,200 degrees C and a strain rate of 5 s(-1) on a Gleeble-3800 thermo-simulation machine. Constitutive equation was obtained by characteristic points of DRX which derived from the strain hardening rate and stress curves. DRX kinetics model was established for determining the recrystallization volume fraction (X). Effect of dynamic precipitation of V(C, N) imposed on DRX at temperatures from 850-1,000 degrees C was analyzed. Results show that true stress-strain curves exhibited no clearly defined stress peaks with typical dynamic recovery behavior. X increased from 43.9% to 100% with increasing deformation temperature, which was in reasonable agreement with the observation of microstructure. Moreover, the calculation pinning force of V(C, N) precipitates was weaker than the recrystallization driving force, revealing that V(C, N) precipitates could effectively retard rather than prevent the progress of DRX.

ISSN号：0334-6455

是否译文：否

发表时间：2017-11-01

合写作者：周双双,刘子利,侯志国,田青超

通讯作者：刘希琴