Microstructure, properties and dynamic recrystallization behavior of 20Mn23AlV non-magnetic structural steel hot rolled plate

doi:10.13251/j.issn.0254-6051.2024.07.014

Abstract

Abstract: Experimental study on the density, microstructure, and mechanical properties of 20Mn23AlV non-magnetic structural steel hot-rolled plate was conducted. Additionally, multi-pass thermal simulation tests were performed to investigate the changes in microstructure and magnetic properties before and after the tests. The results show that, due to the addition of the Al element, the density of the tested steel is reduced by approximately 0.192 g/cm³ compared to that of common steels. The average tensile strength of the hot-rolled plate of non-magnetic steel is 721 MPa, the yield strength is 371 MPa, and the elongation after fracture is 69.5%, indicating good strength-ductility matching. It is found that through multi-pass thermal simulation experiments with 60% hot compression deformation, the tested steel undergoes dynamic recrystallization behavior at 950 ℃, with the average austenite grain size decreasing from 10.24 μm to 6.08 μm. There is no phase transformation before and after the multi-pass thermal simulation tests, and the relative permeability measured is 1.001 and 1.002, respectively, which meets the requirements for the magnetic properties of non-magnetic steel.

Key words: 20Mn23AlV non-magnetic structural steel, density, multi-pass thermal simulation, dynamic recrystallization, relative permeability

CLC Number:

TG162.83

Luo Xiaoyang, Cheng Ganghu, Jin Ke, Zhou Weilian, Hou Yuanyuan, Tang Xingchang. Microstructure, properties and dynamic recrystallization behavior of 20Mn23AlV non-magnetic structural steel hot rolled plate[J]. Heat Treatment of Metals, 2024, 49(7): 91-99.

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