Ultrasonic Evaluation of Porosity in Aluminum Cast Materials.

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Abstract:

A new quantitative ultrasonic method was developed for gas porosity evaluation. The method, which is based on ultrasonic attenuation measurements and spectroscopic analysis of the ultrasonic reflected pulse, is capable of determining gas porosity in the range from 0.1 - 6 volume fraction and for pore sizes from 50 - 55 microns. The range is actually defined by the applied ultrasonic frequency which was from 1 - 20 MHz in this work, which can be extended i.e. for smaller pores by using high frequencies. This is the range encompassing all premium aluminum casting used in aerospace applications. This method can be used in plate-like geometries with thicknesses up to 3 - 4 inches. The technique can also be automated and controlled by a computer. Keywords Cast aluminum gas porosity Ultrasonic test Structural materials Porosity Aluminum castings. KT

Author(s):
Adler, L. ; Nagy, P. B. ; Rypien, D. V. ; Rose, J. H.
Author Organization(s):
OHIO STATE UNIV COLUMBUS DEPT OF WELDING ENGINEERING
Descriptive Note:
Final rept. Oct 85-Dec 87,
Pagination:
0084

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
WRDC-TR-89-4023
Contract/Grant Number(s):
MIPR-FY1457-89-N-5014
Task Number(s):
06
Project Number(s):
2418
Monitor Series:
TR-89-4023
 Subject Terms
Communities of Interest:
No COI(s) Identified
Descriptor(s):
*ALUMINUM, *CASTINGS, *POROSITY, *ULTRASONIC TESTS, ACOUSTIC ATTENUATION, AEROSPACE SYSTEMS, CASTING, CONSTRUCTION MATERIALS, GASES, HIGH FREQUENCY, MATERIALS, MEASUREMENT, PLATES, PULSES, REFLECTION, SPECTROSCOPY, TEST AND EVALUATION, THICKNESS, ULTRASONIC FREQUENCIES, ULTRASONICS
Field(s)/Group(s):
Properties of Metals and Alloys, Acoustics, Test Facilities, Equipment and Methods
Keyword(s):
PE62102F, WUWRDC24180606
Report Date:
1989 May 01