Ultrasonic Measurement and Influence of Nonmetallic Inclusions on Fatigue and Engineering Behavior of Medium and High-Strength Steels

Document Number: 690049

Date Published: February 1969

Author(s):
R. A. Cellitti - International Harvester Co.
Clarence J. Carter - International Harvester Co.

Abstract:
An automatic computerized ultrasonic cleanliness rating system for measuring nonmetallic inclusion content of semifinishhed materials such as steel billets is described and discussed with regard to its function and reliability. Correlative studies relating inclusion areas as measured by light microscopy and magnetic particle inspection were within reasonable agreement with inclusion areas assessed ultrasonically.

To provide design engineers with material quality acceptance standards that are related to mechanical behavior, mechanical tests were performed on high strength (280 ksi ultimate) steel exemplifying various ultrasonic cleanliness levels. A significant impairment in ductility (% reduction of area) is encountered with increasing ultrasonic inclusion severity. Uniaxial fatigue under unidirectional and reversed loading conditions are markedly influenced in proportion to the ultrasonic signature number. Impact and fracture toughness parameters are sensitive to a lesser degree.

Product Status: In Stock

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