Heat Treatment of Metals ›› 2024, Vol. 49 ›› Issue (6): 169-176.DOI: 10.13251/j.issn.0254-6051.2024.06.028

• MICROSTRUCTURE AND PROPERTIES • Previous Articles     Next Articles

Effect of grain size on wear resistance of high nitrogen high manganese austenitic steel

Yang Yang1, Chen Chen1,2,3, Dong Xu1, Liao Pujiu1, Zhang Fucheng4   

  1. 1. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao Hebei 066004, China;
    2. National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University, Qinhuangdao Hebei 066004, China;
    3. Hebei Key Laboratory for Optimizing Metal Product Technology and Performance, Yanshan University, Qinhuangdao Hebei 066004, China;
    4. College of Metallurgy and Energy, North China University of Science and Technology, Tangshan Hebei 063210, China
  • Received:2023-12-04 Revised:2024-04-12 Online:2024-06-25 Published:2024-07-29

Abstract: Dry sliding friction and wear test was carried out for high nitrogen high manganese austenitic steel 60Mn18Cr7N. The microstructure, wear resistance and wear mechanism of the tested steel with different grain sizes were comparatively studied by means of scanning electron microscope, transmission electron microscope and electron backscattered diffraction. The results show that with the decrease of grain size, the yield strength increases, the impact toughness decreases, but the wear resistance increases first and then decreases. For the specimen with grain size of about 98 μm, the yield strength and impact absorbed energy are respectively 486 MPa and 236 J, the mass loss is the lowest as about 43 mg under 1000 N wear load for 120 min, and the surface hardness is 693 HV0.2. In the grain size range of 68-400 μm, the fine grains are beneficial for improving the yield strength, work hardening and resistance to surface plastic cutting ability, while the coarse grains enhance toughness and help suppress the initiation and propagation of cracks in the wear process. The combined action of these two factors is the main reason for the optimum wear resistance of the specimen with grain size about 98 μm. In addition, the higher wear load also leads to a mixed wear mechanism of abrasive wear and adhesive wear.

Key words: high nitrogen high manganese austenitic steel, grain size, mechanical properties, wear resistance

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