Prediction and validation of microstructure and thermophysical properties of 20Mn23AlV non-magnetic steel

doi:10.13251/j.issn.0254-6051.2023.11.002

Abstract

Abstract: Equilibrium phase composition, precipitated phase element composition, effect of austenitizing element content on microstructure, hardenability, mechanical properties and thermophysical properties of the 20Mn23AlV non-magnetic steel were simulated and predicted using JMatPro7.0 software. The simulation parameters were compared and analyzed with the data obtained by some experiments. The calculation results show that the austenite content of the non-magnetic steel accounts for 99.89%, the rest is the dispersed phase with second phase strengthening effect, and the carbon nitride with the highest proportion in the dispersed phase is vanadium metal. The non-magnetic steel does not cause microstructure transformation at different cooling rates, and it is all austenite. The content of Mn and Al should be controlled within a certain range to maximize the proportion of austenite. There is a little difference between the predicted and the measured mechanical properties. With the decrease of temperature, the linear expansion coefficient, specific heat, Poisson's ratio and thermal conductivity decrease, while the density, shear modulus, conductivity and Young's modulus increase.

Key words: JMatPro simulation, 20Mn23AlV non-magnetic steel, equilibrium phase, precipitated phase, mechanical properties, thermophysical properties

CLC Number:

TG142.1

Tang Xingchang, Cheng Ganghu, Zhang Jiaqi, Zhang Zhijian, Zhou Weilian. Prediction and validation of microstructure and thermophysical properties of 20Mn23AlV non-magnetic steel[J]. Heat Treatment of Metals, 2023, 48(11): 8-15.

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