Experimental Study and Calculation of the Precipitation Behavior of Carbides in Fe-5.78Cr-0.35C Alloy during High-Temperature Aging

Abstract:

The precipitation behavior of carbides in Fe-5.78Cr-0.35C (wt.%) alloy during aging at 850°C was studied. The type, particle size and distribution of carbides were determined and measured by the combination of HRTEM (High Resolution Transmission Electron Microscope), XRD (X-Ray Diffraction) and quantitative metallography technique. Results show that the type of carbides was M₇C₃ and the obvious coarsening of carbides was observed during aging. In addition, the thermodynamic and kinetic calculation using Thermo-Calc software was conducted to study the precipitation of carbides. The stable phase in the alloy aging at 850°C was M₇C₃ carbide and austenite which is in accordance with experimental results. According to Ostwald coarsening mechanism, the average interfacial energy between γ phase and M₇C₃ carbide was calculated as 0.7 J·m^-2. Then the precipitation behavior of carbides in Fe-5.78Cr-0.35C alloy during aging was well predicted.

• Periodical: Advanced Materials Research (Volume 936)
• Pages: 1184-1188
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.936.1184
• Online since: June 2014
• Authors: Ming Yue Wang*, Jing Jing Wang, Yan Lin He, Xiao Gang Lu, Lin Li
• Keywords: Aging, Coarsening, M₇C₃ Carbide, Precipitation

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