Effect of solution temperature on microstructure and properties of lightweight high manganese steel

doi:10.13251/j.issn.0254-6051.2023.08.018

Abstract

Abstract: Microstructure and mechanical properties of ZGMn18Cr2-4Al lightweight high manganese steel solution treated at different temperatures were studied by means of optical microscope, X-ray diffractometer, scanning electron microscope, hardness testing, impact testing and tensile testing. The results show that when solution treated at 980-1150 ℃, with the increase of solution temperature, the coarse carbides on the grain boundary dissolve, the grain size first decreases and then increases, the hardness decreases slightly, and then fluctuates in a relatively stable range, the impact absorbed energy increases firstly and then tends to be stable, and the yield strength, tensile strength and elongation increase first and then decrease. The optimal solution treatment temperature of the lightweight steel is 1100 ℃. At the solution treatment temperature of 1100 ℃, the comprehensive properties are the best, with hardness of 269 HV0.2, impact absorbed energy of 160 J, the product of strength and elongation of 39.4 GPa·%, and the tensile fracture is typical ductile fracture.

Key words: solution treatment, lightweight high manganese steel, microstructure, mechanical properties

CLC Number:

TG142.1

Yang Yi, Liu Rangxian, Yang Haokun, Long Jun, Han Peixian, Zheng Zhibin. Effect of solution temperature on microstructure and properties of lightweight high manganese steel[J]. Heat Treatment of Metals, 2023, 48(8): 113-117.

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