INFLUENCE OF TEMPERING TEMPERATURE ON STRUCTURE AND HARDNESS OF 29% Cr WHITE CAST IRON APPLICATION FOR MAKING SCREW SHAFT IN BRICK EXTRUSION MACHINE
Keywords
DOI:
https://doi.org/10.34238/tnu-jst.12883Abstract
High-chromium white cast iron possesses excellent wear and corrosion resistance. To achieve these properties, the cast iron is typically quenched and then tempered at various temperatures to modify the density and size of the secondary carbide particles precipitated during the tempering process. In this study, high-chromium white cast iron containing 29% Cr, after being quenched at 950 °C, was tempered at temperatures ranging from 200 °C to 500 °C. Optical microscopy, X-ray diffraction, and scanning electron microscopy were used to observe and evaluate the precipitation of carbide particles in the resulting microstructure. A hardness tester was also employed to assess the changes in hardness. The results indicate that tempering temperature affects the precipitation of secondary carbide particles, thereby altering the hardness of the cast iron. Within the tempering temperature range of 200 °C to 500 °C, an increase in temperature tends to result in higher hardness. This study also contributes to a better understanding of the influence of secondary carbide density on the hardness of 29%Cr white cast iron during the tempering process.Downloads
References
Y. Zhao, Z. Li, Ye. Li, H. Chen, Z. Tang, Z. Yang, Y. Luo, C. Wu, Y. Liao, and J. Wu, "Effect of quenched-tempered heat treatment on the wear resistance mechanism of zirconia toughened alumina ceramic reinforced high chromium cast iron architecture composite," Journal of Manufacturing Processes, vol. 93, pp.288-298, 2023.
N. Poolthong, H. Nomura, and M. Takita, "Effect of Heat Treatment on Microstructure and Properties of Semi-solid Chromium Cast Iron," Materials Transactions, vol. 45, no. 3, pp. 880-887, 2004.
M. Gelfi, A. Pola, L. Girelli, A. Zacco, M. Masotti, and G. M. L. Vecchia, "Effect of heat treatment on microstructure and erosion resistance of white cast irons for slurry pumping applications," Wear, vol. 428-429, pp. 438-448, 2019.
R. C. Touhami, S. Mechachti, K. Bouhamla, A. Hadji, and A. Khettache, "Wear Behavior and Microstructure Changes of a High Chromium Cast Iron: The Combined Effect of Heat Treatment and Alloying Elements," Metallography, Microstructure, and Analysis, vol. 12, pp. 580-590, 2023.
B. N. Nelwalani, J. V. D. Merwe, V. Munyangane, Z. A. Cader, T. Rampaku, and D. Klenam, "On the influence of compositional variations in high chrome cast iron: an assessment of microstructure and mechanical behaviour," Manufacturing Review, vol. 11, no. 9, pp. 1-12, 2024.
P. Amorim, H. Santos, J. Santos, S. Coimbra, and C. Sá, "Soft Annealing of High Chromium White Cast Iron," Materials Science Forum, vol. 455-456, pp. 290-294, 2004.
A. Wiengmoon, J. T. H. Pearce, and T. Chairuangsri, "Relationship between microstructure, hardness and corrosion resistance in 20 wt.%Cr, 27 wt.%Cr and 36 wt.%Cr high chromium cast irons," Materials Chemistry and Physics, vol. 125, pp. 739-748, 2011.
M. Ngqase and X. Pan, "An Overview on Types of White Cast Irons and High Chromium White Cast Irons," Journal of Physics: Conference Series, vol. 1495, 2020, Art. no. 012023.
Z. Karoly, J. Szepvolgyi, W. Kaszuwara, O. Łabe˛dz´, and M. Bystrzejewski, "Influence of ferrite stabilizing elements and Co on structure and magnetic properties of carbon-encapsulated iron nanoparticles synthesized in thermal plasma jet," Journal of Alloys and Compounds, vol. 619, pp. 592-600, 2015.
L. E. Samuels, "Tempering of Martensite," Metallography Microstructure and Analysis, vol. 3, pp. 70-90, 2014.
B. Liu, T. Qin, W. Xu, C. Jia, Q. Wu, M. Chen, and Z. Liu, "Effect of Tempering Conditions on Secondary Hardening of Carbides and Retained Austenite in Spray-Formed M42 High-Speed Steel," Materials, vol. 12, 2019, Art. no. 3714.
