The Effect of Ultrasonic Treatment on the Oxidation Resistance and Microstructure of Fe₈₀Cr₂₀Alloy Powder at High Temperature Oxidation Process

Abstract

Effect of ultrasonic treatment on the oxidation kinetics and microstructure of Fe80Cr20alloy is investigated. The aim of this study is to improve the surface morphology and oxidation resistance of the Fe80Cr20alloy powder as a raw material. Ultrasonic technique is very promise technology and not yet fully explored. The Fe80Cr20material was treated by ultrasonic technique (UT) at various times of 3.5 h, 4.5 h, 5 h and followed by cold compaction with force of 13 Newton. The oxidation test was carried out using tube furnace under argon gas environment with 5 cycles, which has been considered. It was found that the UT has improved the surface morphology of the material effectively. Ultrasonic was revealed that the good interparticle bonding when experimented with ultrasonic treatment at 4.5 h. In the oxidation test, the lowest mass gain of 68 mg/cm2was found at the oxidation time of 100 h. Meanwhile, the lowest parabolic rate constant of 6.8198 x 10-14g2cm-4s-1was revealed when ultrasonic for 4.5 h sample.

New Method of Fabrication of Fe80Cr20 Alloy: Effect of its Technique on Crystallite Size and Thermal Stability

“…Intermetallic Fe 80 Cr 20 developed by using mechanical alloying with milling time of 40 hours and 60 hours, prior to implanted by using Lanthanum (La), it is consolidated at temperature of 1273 K and pressure of 25 MPa [7]. FeCrAl is treated using ultrasonic technique prior to nickel electroplating which have been studied [8,9] and they found that the ultrasonic technique effective to break the agglomerates or to improve homogeneity, improve surface morphology of the FeCrAl alloys. Some previous research above shows that the crystallite size of Fe80Cr20 alloy, clear correlation with temperature operation.…”

“…Some previous research above shows that the crystallite size of Fe80Cr20 alloy, clear correlation with temperature operation. Ball milling and ultrasonic technique is shown inconvenience results in growth rate of crystallite size at high temperature operation [3][4][5][6][7][8][9][10][11]. Therefore, this study will combine between ball milling and ultrasonic technique.…”