Zhang Yongwei,Liu Zhihao,Zhang Qingxue,et al.Effect of Rare Earth Ce on the Microstructure and Properties of NM550 Wear-Resistant Steel[J].Special Steel,
Zhang Yongwei,Liu Zhihao,Zhang Qingxue,et al.Effect of Rare Earth Ce on the Microstructure and Properties of NM550 Wear-Resistant Steel[J].Special Steel,DOI:.
Effect of Rare Earth Ce on the Microstructure and Properties of NM550 Wear-Resistant Steel
The microstructure, mechanical properties, wear resistance, and wear mechanism of NM550RE steel alloyed with 0.001 2% rare-earth
w
[Ce] were systematically studied, and compared them with those of conventional NM550 steel. The results show that the conventional NM550 steel has an average original austenite grain size of 9.48 μm and a hardness of 553HBW. The addition of Ce refines the grain size, reducing the average austenite g
rain size to 7.55 μm and increasing the hardness to 579HBW. Meanwhile, the impact energy at -40 °C increases from 29.43 J to 34.63 J. The G65 abrasive wear test results show that the wear resistance of NM550RE steel is 1.11 times that of conventional NM550 steel. After rare-earth modification, the inclusions exhibit better compatibility with the matrix, while the steel possesses a fine grain size, higher hardness, and toughness. During wear, this helps hinder abrasive particles from penetrating into the matrix and prevents further development of ploughing grooves, thereby reducing their width and depth and resulting in superior wear resistance.
Zdravecká E , Tkáčová J , Ondáč M . Effect of microstructure factors on abrasion resistance of high-strength steels [J]. Research in Agricultural Engineering , 2014 , 60 ( 3 ): 115 - 120 .
Wen E D , Song R B , Xiong W M . Effect of tempering temperature on microstructures and wear behavior of a 500 HB grade wear-resistant steel [J]. Metals , 2019 , 9 ( 1 ): 45 - 52 .
Wang H , Bao Y P , Zhao M , et al . Effect of Ce on the cleanliness, microstructure and mechanical properties of high strength low alloy steel Q690E in industrial production process [J]. International Journal of Minerals, Metallurgy and Materials , 2019 , 26 ( 11 ): 1372 - 1384 .
Lonsdale D , Flewitt P E J . The role of grain size on the ductile-brittle transition of a 2.25 Pct Cr-1 Pct Mo steel [J]. Metallurgical Transactions A , 1978 , 9 ( 11 ): 1619 - 1623 .
Morris J W . The influence of grain size on the mechanical properties of steel [J]. Ductile Brittle Transitions . 2001
Wang X Q , Wu Z W , Li B , et al . Inclusions modification by rare earth in steel and the resulting properties: A review [J]. Journal of Rare Earths , 2024 , 42 ( 3 ): 431 - 445 .
Lian X T , Chen L , Fan Z W , et al . Effects of modified inclusions and precipitates alloyed by rare earth element on corrosion and impact properties in low alloy steel [J]. Acta Metallurgica Sinica (English Letters) , 2022 , 35 ( 10 ): 1719 - 1730 .
Wang X Q , Wu Z W , Li B , et al . Inclusions modification by rare earth in steel and the resulting properties: A review [J]. Journal of Rare Earths , 2024 , 42 ( 3 ): 431 - 445 .
Rabinowicz E , Dunn L A , Russell P G . A study of abrasive wear under three-body conditions [J]. Wear , 1961 , 4 ( 5 ): 345 - 355 .
Moore M A , King F S . Abrasive wear of brittle solids [J]. Wear , 1980 , 60 ( 1 ): 123 - 140 .