Effect of carbide distribution on microstructure and properties of NM500 grade wear-resistant steel

LI Zhengtao; XIONG Jincheng; ZHANG Hongbo; ZHOU Chun; LI Qiyuan

doi:10.7513/j.issn.1004-7638.2026.04.014

Volume 47 Issue 4

Aug. 2026

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LI Zhengtao, XIONG Jincheng, ZHANG Hongbo, ZHOU Chun, LI Qiyuan. Effect of carbide distribution on microstructure and properties of NM500 grade wear-resistant steel[J]. IRON STEEL VANADIUM TITANIUM, 2026, 47(4): 117-124. doi: 10.7513/j.issn.1004-7638.2026.04.014

Citation:

LI Zhengtao, XIONG Jincheng, ZHANG Hongbo, ZHOU Chun, LI Qiyuan. Effect of carbide distribution on microstructure and properties of NM500 grade wear-resistant steel[J]. IRON STEEL VANADIUM TITANIUM, 2026, 47(4): 117-124. doi: 10.7513/j.issn.1004-7638.2026.04.014

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Effect of carbide distribution on microstructure and properties of NM500 grade wear-resistant steel

doi: 10.7513/j.issn.1004-7638.2026.04.014

LI Zhengtao^{1, 2
,},
XIONG Jincheng^{1, 2},
ZHANG Hongbo^{1, 2
,
,},
ZHOU Chun^{1, 2},
LI Qiyuan^{1, 2}

1.
Hunan Valin Lianyuan Iron and Steel Co., Ltd., Loudi 417009, Hunan, China
2.
Hunan Valin Lianyuan Steel Special New Material Co., Ltd., Loudi 417009, Hunan, China

More Information

Received Date: 2026-03-03
Accepted Date: 2026-04-03
Rev Recd Date: 2026-03-30
Publish Date: 2026-08-31

Abstract

Abstract

Martensitic wear-resistant steel is widely used in metallurgy, building materials due to its excellent wear resistance. However, its insufficient toughness limits the service life of the material. To address this issue, a two-step tempering heat treatment after quenching was adopted to promote the precipitation of carbides within the martensitic laths. The results show that the two-step tempering reduces the proportion of carbides at grain boundaries from 45% after conventional tempering to 25%, leading to superior impact toughness and wear resistance compared to conventional tempering. Orthogonal experimental analysis and variance analysis reveal that the temperature and duration of the first tempering step exert significant effects on impact toughness and hardness, respectively. The optimal two-step tempering process is identified as tempering at 130 ℃ for 45 minutes followed by 200 ℃ for 45 minutes. Compared with conventional tempering at 200 ℃ , this process improves impact energy and wear resistance by 20% and 42%, respectively.
- carbides,
- martensitic wear-resistant steel,
- toughness,
- orthogonal experiment

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References(14)

References

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