关键词: 髙速列车车轴, 30NiCrMoV12钢, 热变形激活能, 热加工图, 可锻性

Abstract: The hot compression test on steel 30NiCrMoV12 for high speed train axles (/% : 0.26C, 0.33Si, 0.62Mn, 3.01 Ni, 0.82Cr, 0.56Mo, 0.10V) with strain rate 0.01-10 s^-1 at 850-1150 ℃ has been carried out by using Gleeble-3500 thermal simulation machine with specimen cutting from 0250 mm forges. The austenite deformation behavior and rule of recrystallization of steel for axles during hot deformation process are studied to define the hot deformation equation of steel for axles and establish its hot working map with true strain s 0.5 and 0. 9. Results show that at definite strain rate, the higher temperature and the heavier deformation, the more beneficial to occurrence of dynamic recrystallization of steel; with raising temperature and decreasing strain rate, the efficiency of energy dissipation η gradually increases ； and with true strain 0.5 and strain rate 0. 01 s^-1 at 1100 ℃ the efficiency of energy dissipation is up to max value- 0.41. At 1000-1150 ℃ with strain rate 0.01 〜10 s^-1 the steel for axles has better forgeability.

Key words: High Speed Train Axles, Steel 30NiCrMoV12, Hot Deformation Activation Energy, Hot Working Diagram, Forgeability