Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/1440

Title

Effects of grain size and surface roughness on ultrasonic testing of aluminum alloy die castings

Author(s)

Iovenitti, Pio G.;  Nagarajah, Chesney R.;  Palanisamy, Suresh

Abstract

Ultrasonic testing of castings is difficult due to the influence of the casting process, microstructural variations, surface roughness and the complex shape of castings. The use of ultrasound for the testing of castings depends on the skill and expertise of the operators. However, the initial experimental setup is critical in developing a proper test procedure. This paper describes the procedure used to determine a suitable frequency range for the testing of UNS A23800 aluminum alloy castings while accommodating material variations within the part. The results obtained from immersed pulse/echo ultrasonic testing indicate that focused probes operating at frequencies between 5 and 10 MHz are more suited to the testing of aluminum alloy die castings with surface roughness R[a] values varying from 50 to 100 μm (2 × 10[-3]to 4 x 10[-3] in.). Nevertheless the final selection of a suitable frequency will depend largely on the size of discontinuities to be detected.

Publication type

Journal article

Research centre

Swinburne University of Technology. Faculty of Engineering and Industrial Sciences

Source

Materials Evaluation, Vol. 63, no. 8 (2005), pp. 832-836

Publication year

2005

Publisher

American Society for Nondestructive Testing

Format

pp. 832-836

ISSN

0025-5327

Publisher URL

http://www.asnt.org/publications/materialseval/materialseval.htm

Peer reviewed