Effect of Rare Earth on Low Temperature Impact Toughness of Wear-resistant Plate NM400
Rare earth is an important component of most alloy steels, traditionally used to improve the wear resistance of steel materials, improve low temperature impact toughness, and enhance corrosion resistance. This article aims to evaluate the effect of rare earth on the low temperature impact toughness of wear-resistant plate NM400.
2 Analysis of NM400 Steel
NM400 is a wear-resistant steel plate with a thickness of 8-50 mm, a high strength of 700-1300 MPa, and a good toughness and plasticity. The main component of NM400 steel plate is C, Si, Mn, S and P. Rare earth elements can effectively enhance the wear resistance, plasticity and toughness of NM400.
3 Evaluation Mechanism of Low Temperature Impact Toughness
Before evaluating the effect of rare earth on low temperature impact toughness, it is necessary to understand the evaluation mechanism of low temperature impact toughness. The impact strength of steel material is mainly determined by the mean free path of dislocation, the motivation and barrier degree of dislocation, and the solid solution effect of alloy elements.
4 Effect of Rare Earth on Low Temperature Impact Toughness
The addition of rare earth in NM400 wear-resistant steel can improve its low temperature impact toughness. Rare earth elements have a solid solution strengthening effect due to their large atomic radius and electronegativity. The larger the atomic radius and electronegativity, the better the solid solution effect. Rare earth elements can form fine, uniform and stable particles in steel, reduce the mean free path of dislocations, increase the energy barrier of dislocations, and postpone the movement of dislocations. This makes NM400 wear-resistant steel have better plasticity and toughness at low temperature.
In addition, rare earth elements can also control the formation of carbides and other compounds in the steel matrix. The proper addition of carbides, nitrides and borides can improve the wear resistance of the steel and improve its impact resistance.
5 Conclusion
Rare earth elements have a good solid solution effect on NM400 wear-resistant steel and can effectively improve its low temperature impact toughness. The additions of rare earth can control the formation of carbides and other compounds in the steel matrix, which can further strengthen its wear resistance and enhance its impact tougness. It is concluded that rare earth addition can effectively improve the low temperature impact toughness of NM400 steel.
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