Effect of aging time on microstructure and properties of a low density ultra-high manganese cast steel

doi:10.13251/j.issn.0254-6051.2021.08.022

Abstract

Abstract: To improve the initial hardness and strength, an low density ultra-high manganese cast steel was designed. After water toughening, the tested steel was carried out aging treatment at 550 ℃ for 1-4 h and the effect of aging time on microstructure and properties was investigated. The experimental results show that the tested steel can obtained optimum mechanical properties after aging for 2 h. Its tensile strength is 1041.7 MPa, yield strength is 1002.7 MPa, elongation is 17.6%, impact absorbed energy (V-notch) is 62.0 J, and hardness is 268.5 HBS. Compared with the as-water toughened, the yield strength and the hardness of the steel are increased by 107.3% and 28.8% respectively, which can be attributed to the precipitation-hardened effect originating from the precipitation of nano-sized κ-carbides.

Key words: ultra-high manganese steel, low density, aging treatment, microstructure, mechanical properties

CLC Number:

TG142.1

Gao Zhizhe, Cheng Fuchao, Feng Yifan, Sun Jian, Wang Yongjin. Effect of aging time on microstructure and properties of a low density ultra-high manganese cast steel[J]. Heat Treatment of Metals, 2021, 46(8): 115-120.

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