37 - Nodularity, Its Measurement, and its Correlation with the Mechanical Properties of Ductile Iron

Abstract:

The relationship between nodularity and mechanical properties in the various SAE grades of ductile iron were determined in this study. In addition, a correlation between nodularity and ultrasonic velocity was also developed and an evaluation of this relationship was performed. A large number of heats (26) were procured for this investigation. Six grades of ductile iron were produced, including D4018 Annealed, D4018 As-cast, D4512, D5506, D7003 and D9002. Test bars were produced at various levels of nodularity with nodularities ranging from 95% to 43%. The test castings consisted of keel blocks and rounds of 1-inch section size.