QLT heat treatment process of NM500 wear-resistant steel

doi:10.13251/j.issn.0254-6051.2023.10.023

Abstract

Abstract: NM500 wear-resistant steel was subjected to quenching at 940 ℃, intercritical quenching, and tempering (QLT) treatment, and the effects of the intercritical quenching temperature (820-880 ℃) and tempering temperature (200-600 ℃) on the microstructure and mechanical properties of the tested steel were investigated. The results show that the tested steel is martensitic and ferrite dual-phase after intercritical quenching from 820 ℃ to 880 ℃, and the ferrite content gradually decreases and martensite increases, and the strength and hardness of the tested steel increase, and the impact absorbed energy at -40 ℃ decreases from 67 J to 33 J. When intercritical quenched at 870 ℃ and tempered at the range of 200-600 ℃, with the increase of tempering temperature, the lath martensite and retained austenite gradually decompose, and the morphology and distribution of carbides change. The tensile strength and hardness gradually decrease, and the low temperature impact absorbed energy first decreases and then increases. The tempering temperature range for the tested steel to achieve a good match of strength and toughness is 200-250 ℃.

Key words: wear-resistant steel, intercritical quenching, microstructure, mechanical properties

CLC Number:

TG156

Zhang Meng, Wu Guangliang. QLT heat treatment process of NM500 wear-resistant steel[J]. Heat Treatment of Metals, 2023, 48(10): 157-162.

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