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Metals 2016, 6(11), 260; doi:10.3390/met6110260

Effect of Ultrasonic Treatment on the Solidification Microstructure of Die-Cast 35CrMo Steel

1
College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China
2
National Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China
*
Author to whom correspondence should be addressed.
Academic Editor: Hugo F. Lopez
Received: 20 August 2016 / Revised: 20 October 2016 / Accepted: 25 October 2016 / Published: 28 October 2016
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Abstract

The effects of ultrasonic treatment (UST) on the solidification microstructure of a 35CrMo steel cast ingot were investigated. To avoid the erosion of a high-temperature melt, a T-shaped ultrasonic waveguide unit was used to introduce ultrasonic vibrations into a 35CrMo steel die casting melt. The experimental results show that the microstructure of the ingot was refined by ultrasonic treatment. While the microstructure of untreated 35CrMo steel is coarse dendritic grains, after the introduction of ultrasonic treatment, the solidification microstructure transforms from coarse dendritic to equiaxed grains, and the dendrites are also refined. Samples from different positions of the ingots were subjected to different ultrasonic effects, and the effects on grain refinement also varied due to the severe attenuation of the ultrasound in the melt. The mechanisms of grain refinement using ultrasonic treatment for 35CrMo steel melt are presented. View Full-Text
Keywords: 35CrMo steel; casting; solidification microstructure; ultrasonic treatment; grain refinement 35CrMo steel; casting; solidification microstructure; ultrasonic treatment; grain refinement
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Liang, G.; Shi, C.; Zhou, Y.; Mao, D. Effect of Ultrasonic Treatment on the Solidification Microstructure of Die-Cast 35CrMo Steel. Metals 2016, 6, 260.

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