热轧中锰马氏体耐磨钢的冲击磨损行为

doi:10.13228/j.boyuan.issn0449-749x.20220053

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Abstract The impact abrasive wear behavior of hot-rolled medium manganese martensite wear-resistant steel under the impact energy of 1 J, 2.5 J and 5 J was systematically studied by MLD-10 dynamic load abrasive wear tester, and compared with that of Hardox450 steel. With the help of optical microscope (OM), scanning electron microscope (SEM) and Brinell hardness tester, the microstructure, mechanical properties, wear surface layer and sub-surface layer of the test steel were analyzed, and the wear mechanism was discussed. The results show that the microstructure of the experimental steel is lath martensite. Compared with Hardox450 steel, the Brinell hardness of the experimental steel is higher, and the impact absorption energy at -40 ℃ is lower, which is 503 HB and 15.3 J respectively. Under the same working conditions, the wear weight loss of the test steel is obviously smaller than that of Hardox450 steel, and the wear rate corrected based on the effective wear time increases first and then decreases with the increase of impact energy. When the impact energy is 2.5 J, the wear rate is the highest and the grinding loss is the largest. The reason are as follows. When the impact energy is low, the wear of the test steel is mainly furrow, accompanied by a small amount of embedded abrasive particles, resulting in less wear loss; When the impact energy is 2.5 J, the cutting of the worn surface is intensified, and the plastic deformation makes a large number of abrasive grains to embedded in the matrix, resulting in stress concentration, which leads to fatigue cracks in the repeated impact process, and then extends to the surface of the experimental steel, resulting in increased fatigue wear and spalling of the matrix, obvious spalling pits in the worn sub-surface, and significantly increase in weight loss. When the impact energy is 5 J, the plastic deformation of the worn surface increases, the work hardening is obvious, fatigue wear dominates, the hardness of the worn surface is higher, the furrows and abrasive grains are less embedded, the worn sub-surface layer is more even, the weight loss decreases, and the wear rate decreases.

Key words： medium manganese martensitic wear resistant steel impact abrasive wear impact energy wear rate wear mechanism

Received: 17 January 2022

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	Articles by authors
	ZHU Xiao-xiang
	YANG Geng-wei
	ZHAO Gang
	HAN Ru-yang
	FU Zhi-xiang
	BAO Shuang

Cite this article:

ZHU Xiao-xiang,YANG Geng-wei,ZHAO Gang等. Impact abrasive wear behavior of hot-rolled medium manganese martensitic wear-resistant steel[J]. Iron and Steel, 2022, 57(7): 154-161.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20220053 OR http://www.chinamet.cn/Jweb_gt/EN/Y2022/V57/I7/154

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