稀土钇处理对铁路辙叉用高锰钢中夹杂物的改性

doi:10.13228/j.boyuan.issn1006-9356.20230439

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Abstract The high manganese steel frog is a key part of railway transportation system and has important influence on railway safety operation. Inclusion in steel has an important effect on steel properties, and rare earth modified inclusion is effective means to control inclusion. Based on thermodynamic and first principle calculation, as well as experimental research, the evolution of inclusions and their effects on the properties of high manganese steel used for railway frog before and after rare earth treatment were analyzed systematically. The thermodynamic results show that the main inclusions in high manganese steel are MnS and Al₂O₃ when rare earth Y is not added. After the addition of rare earth Y, MnS and Al₂O₃ in high manganese steel are transformed into Y₂S₃, YS, YAlO₃, Y₂O₃ and Y₂O₂S. When Y mass fraction is 0.03%, all inclusions are transformed into rare earth inclusions. The first principle calculation results show that the order of inclusion formation and stable existence in high manganese steel is as follows, Y₂O₃＞YAlO₃＞Y₂O₂S＞Al₂O₃＞Y₂S₃＞YS＞MnS. Al₂O₃ and YAlO₃ are unfavorable to the properties of high manganese steel, while the inclusion containing rare earth has relatively good ductility and elasticity, which can effectively reduce the stress concentration around the inclusion. When the additive amount of Y in steel is 0.031 9%, the modification effect of inclusions in high manganese steel is the best, and rare earth inclusions with small size are generated, some complex inclusions are transformed into near spherical Y₂S₃-Y₂O₂S, and the outer Y₂S₃ inclusions have good elasticity and low hardness, which can reduce the stress concentration between inclusions and matrix, and can effectively improve the mechanical properties of high manganese steel. The research work provides a theoretical basis for the control of rare earth on inclusions in steel.

Key words： high manganese steel inclusion rare earth treatment thermodynamic calculation first principles computation

Received: 17 July 2023

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	LI Rong
	MENG Qian
	LI Tao
	TAN Min
	CHEN Chen
	ZHANG Fucheng

Cite this article:

LI Rong,MENG Qian,LI Tao等. Modification of inclusions in high manganese steel for railway frog treated with rare earth Y[J]. China Metallurgy, 2023, 33(12): 66-78.

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http://www.zgyj.ac.cn/EN/10.13228/j.boyuan.issn1006-9356.20230439 OR http://www.zgyj.ac.cn/EN/Y2023/V33/I12/66

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