Abstract
In order to improve the performances of large-size 35CrMoV cast ingot, ultrasonic flexural vibration was guided into 35CrMoV steel melt through L-shaped ultrasonic waveguide rod during the solidification, and the effects of ultrasonic flexural vibration on macrostructure, microstructure, and mechanical properties of large-size 35CrMoV cast ingot were investigated. It is found that the columnar crystal zone has disappeared and the ingot is composed of the equiaxed crystals present in the ultrasonic ingot. The size of grains treated by ultrasonic are significantly smaller than conventional ingot. The distribution of ferrite in matrix structure is also more uniform than conventional ingot. The tensile strength is increased by 3.14%∼17.12%, and the elongation is increased by 39.13%∼287.50% compared with the conventional ingot at different positions.
Highlights
Advances in Materials Science and Engineering factor makes it extremely difficult to introduce ultrasonic wave into steel melt for a long time
Ultrasonic wave is guided into melt through straight ultrasonic waveguide rod traditionally, whose disadvantage is that the upward thermal radiation of the molten steel can decrease the effective life of the ultrasonic transducer
In order to solve these problems, we successfully developed a kind of nanoceramic material that can effectively slow down the dissolution of sonotrode in steel melt, and we designed the T-shaped ultrasonic waveguide rod, which could successfully avoid the damage of the upward thermal radiation to the ultrasonic transducer [18, 19]
Summary
Advances in Materials Science and Engineering factor makes it extremely difficult to introduce ultrasonic wave into steel melt for a long time. Ultrasonic wave is guided into melt through straight ultrasonic waveguide rod traditionally, whose disadvantage is that the upward thermal radiation of the molten steel can decrease the effective life of the ultrasonic transducer. In order to solve these problems, we successfully developed a kind of nanoceramic material that can effectively slow down the dissolution of sonotrode in steel melt, and we designed the T-shaped ultrasonic waveguide rod, which could successfully avoid the damage of the upward thermal radiation to the ultrasonic transducer [18, 19]. Ultrasonic flexural vibration was guided into 35CrMoV steel melt through L-shaped ultrasonic waveguide rod, and the influences of ultrasonic flexural vibration on macrostructure, microstructure, and mechanical properties of large-size 35CrMoV cast ingot were investigated
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