Effect of intercritical quenching on toughening and properties of low alloy wear-resistant steel

doi:10.13251/j.issn.0254-6051.2024.03.004

Abstract

Abstract: NM500 wear-resistant steel was toughed by intercritical quenching. The results show that after intercritical quenching at 790 ℃ and tempering at 170 ℃, the microstructure of the tested steel contains 7.3% volume fraction of ferrite, and the impact absorbed energy is increased from 40 J after complete quenching to 58 J, with the best wear resistance. Complete austenitization cooling to below Ac₃ followed by intercritical quenching reduces wear properties of the steel due to the distribution of ferrite, while impact absorbed energy does not change a lot. Intercritical quenching increases the carbon content of martensite, a small amount of needle-like ferrite in the structure can improve the toughness of the steel, and wear resistance is better than that of the complete quenched.

Key words: intercritical quenching, ferrite, NM500 grade wear-resistant steel, impact property, wear resistance

CLC Number:

TG156.1

Hu Ang, Wu Run, Li Zhongbo, Wu Teng. Effect of intercritical quenching on toughening and properties of low alloy wear-resistant steel[J]. Heat Treatment of Metals, 2024, 49(3): 22-27.

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