Hot deformation behavior and processing maps of Maraging250 steel based on friction and temperature double correction

doi:10.13251/j.issn.0254-6051.2021.05.018

Abstract

Abstract: Hot deformation behavior of Maraging250 steel at deformation temperature of 900-1200 ℃ and strain rate of 0.001-10.0 s^-1 was studied by using Gleeble-3800 thermal simulation test machine. The flow stress curves were modified based on friction and temperature double correction, from which the constitutive equation and processing map of the Maraging250 steel were established. The microstructure change of the tested steel under different deformation conditions were analyzed according to the processing map at true strain of 1.2. The results show that, with the decrease of deformation temperature or the increase of strain rate under the same test conditions, the effect of friction on the flow stress of the tested steel is more significant. The deformation heat has a significant effect on the flow stress only under high strain rate and low temperature conditions, which leads to the maximum temperature rise and the maximum flow stress change, being about 80 ℃ and 20 MPa, respectively. Hot deformation activation energy of the tested steel is calculated to be 393.552 02 kJ/mol by using the double-corrected flow stress curves, and the Z parameter equation and constitutive equation are established, the processing maps at true strain ε=0.4, 0.8 and 1.2 are plotted. Combined with the microstructure analysis, it is proposed that the Maraging250 steel can obtain uniform and fine dynamic recrystallization microstructure in the range of 1000-1125 ℃, 0.001-1.0 s^-1, with better hot processing performance.

Key words: Maraging250 steel, stress-strain curve correction, constitutive equation, hot processing map, microstructure

CLC Number:

TG142.1

Shang Limei, Wang Chunxu, Han Shun, Li Yong, Pang Xuedong, Li Jianxin, Yang Chao. Hot deformation behavior and processing maps of Maraging250 steel based on friction and temperature double correction[J]. Heat Treatment of Metals, 2021, 46(5): 111-117.

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