材料期刊网

To achieve ultrasonic casting of 35CrMo steel,the waveguide unit for introducing ultrasound into liquid steel was studied numerically and experimentally.The structure and length of the ultrasonic waveguide were opti-mized by modal analysis.The simulation results showed that a T-shaped waveguide unit matched the vibrational sys-tem better than an L-shaped unit.The performance of T-shaped waveguide unit was optimized when the length of the ultrasound radiator was 135 mm.The performance of the T-shaped waveguide unit was investigated in ultrasonic casting experiments,and the effect of ultrasound on the microstructure of 35CrMo steel was examined.The experi-mental results showed that the T-shaped waveguide was able to successfully introduce ultrasound into the 35CrMo melt.In addition,the use of a silicon nitride ceramic radiator avoided high-temperature corrosion in the molten metal. The microstructure of the treated area was significantly refined and equiaxed grains were obtained.The results repre-sented a novel method for ultrasonic casting of steel.