Abstract
The oxide dispersion strengthened (ODS) ferritic steels are one of the most important in fuel cladding materials for 4th Generation nuclear reactors because of their excellent mechanical properties such as irradiation resistance, swelling resistance, and elevated temperature tensile/compressive strength. Mechanical alloying (MA) is one of the most promising routes for developing nanocrystalline ferritic ODS steel materials. For the production of nanocrystalline ferritic ODS steel powders, the most influencing factor is the milling speed and milling time during the mechanical alloying process. With the improper selection of milling time and speed, the final milled powders become an amorphous structure consisting of high impurity inclusions in the microstructure, and strength was also affected. In order to overcome these drawbacks, the present investigation was taken into account for the selection of appropriate mechanical milling speed and time, which was optimized through Taguchi analysis followed by the MA process. The optimized mechanical milling speed and time of milled powders were characterized through X-Ray Diffraction Analysis (XRD) and Scanning Electron Microscope (SEM).
Highlights
Ferritic oxide dispersion strengthened (ODS) steels have been motivated for the generation IV fusion, fission nuclear reactors for resisting the harsh environments
Where l is denoted as X-ray wavelength, b is denoted as the full width at half maximum (FWHM), u is denoted as Bragg angle [14]
It is evident that based on the grade result as shown in Table 4, the most significant influential factor is milling speed on the crystallite size followed by the milling time
Summary
Ferritic oxide dispersion strengthened (ODS) steels have been motivated for the generation IV fusion, fission nuclear reactors for resisting the harsh environments It is used for resisting the high operating temperatures in nuclear reactors. To achieve superior mechanical properties at elevated temperature, the most influencing factor is finely dispersed nano oxide particles and the high density in the homogeneous grain matrix with unique microstructure, which was important for the ODS steel. These can be achieved through the mechanical alloying (MA) process followed by the high-energy planetary ball milling method [4,5]. In order to select the appropriate milling speed and time of the ferritic ODS steel, the Taguchi analysis and analysis of variance (ANOVA) was utilized in the present study
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