Heat Treatment of Metals ›› 2023, Vol. 48 ›› Issue (5): 98-103.DOI: 10.13251/j.issn.0254-6051.2023.05.016

• MATERLALS RESEARCH • Previous Articles     Next Articles

Effect of La on microstructure and properties of niobiumized layer on H13 steel

Tan Shenlu1, Zhang Yue1, Zhang Mengjiu2, Xie Aijun2, Shang Jian1   

  1. 1. School of Materials Science and Engineering, Liaoning University of Technology, Jinzhou Liaoning 121000, China;
    2. Qingdao Choho Industrial Co., Ltd., Qingdao Shangdong 266705, China
  • Received:2022-11-05 Revised:2023-04-04 Online:2023-05-25 Published:2023-06-21

Abstract: Effect of La content on microstructure and tribological properties of niobium carbide infiltration layer on H13 steel prepared by solid powder embedding method and niobiumizing agent with La addition was studied by means of optical microscope, scanning electron microscope, energy dispersive spectrometer and X-ray diffractometer. The results show that under different La content (0%-5%) conditions, the infiltration layer on the 3H13 steel is mainly composed of NbC. The addition of appropriate amount of La is beneficial for improving the density, hardness and tribological properties of the infiltration layer. With the increase of La content, the microhardness of the infiltration layer first increases and then decreases. When the La content is 3%, the microstructure of the infiltration layer is uniform and dense, with thickness of 7-9 μm and higher hardness (1669 HV0.2). Under corresponding friction conditions, as the La content increases, the average friction coefficient of the infiltration layer decreases first and then increases, and the wear resistance is the best when the rare earth La content is 3%.

Key words: La, niobiumized layer, microstructure, friction and wear property

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