Effect of Ultrasonic Melt Treatment on Microstructure and Mechanical Properties of 35CrMo Steel Casting

2017 3rd International Conference on Environmental Science and Material Application

生态环境科学;材料科学

Shi, Chen^1,2 ; Li, Fan^1,2 ; Liang, Gen^1,2 ; Mao, Daheng^1,2

Central South University, State Key Laboratory of High Performance Complex Manufacting, Changsha, Hunan

410083, China^1

Central South University, College of Mechanical and Electrical Engineering, Changsha, Hunan

410083, China^2

关键词: After-heat treatment;    Microstructure and mechanical properties;    Power ultrasonic;    Solidification microstructures;    Ultrasonic melt treatment;    Ultrasonic power;    Ultrasonic treatments;    Ultrasonic vibration;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/108/2/022061/pdf
DOI  :  10.1088/1755-1315/108/2/022061

来源: IOP

【 摘 要 】

Effects of different power ultrasonic on microstructure and mechanical properties of 35CrMo steel casting were investigated using optical microscopy (OM), scanning electron microscopy (SEM) and hardness testing. A self-developed experiment apparatus was used for the propagation of ultrasonic vibration into the 35CrMo steel melt to carry out ultrasonic treatment. The experimental results showed that compared to the traditional casting, ultrasonic treatment can obviously change the solidification microstructure of 35CrMo steel, which is changed from coarse dendrites to fined dendrites or equiaxed grains. With the increase of ultrasonic power, equiaxed crystal is remarkably refined and its area is broadened. The micro porosity percentage of ingot casting decreases significantly and the porosity defects can be suppressed under ultrasonic treatment. The mechanical properties of 35CrMo steel ingot after heat treatment were enhanced by ultrasonic treatment: the maximum tensile strength is improved by 8.4% and the maximum elongation increased by 1.5 times.