SYMPOSIA PAPER Published: 01 January 1984
STP32567S

Influence of Inclusions on the Fracture Properties of A588A Steel

Source

The influence of nonmetallic inclusions on the fracture properties of A588 Grade A steel plate is investigated by evaluating one plate produced by conventional steel-making practices and another using calcium treatment. The two plates had differing inclusion structures and their characterization included: tensile, Charpy V-notch, dynamic tear, and J-integral testing; JIc, tearing modulus, and Ja and J-T curve determinations on the upper shelf; and fatigue crack propagation and near-threshold fatigue evaluations. Testing of up to six specimen orientations was used, depending on the testing method. Of all the test methods used in this investigation the JIc and J-T curve determinations were found to be the most sensitive to changes in inclusion structure in all testing orientations. The fatigue crack growth rate of the calcium-treated steel was primarily improved in the through-thickness (SL) orientation at higher ΔK levels. Testing at higher load ratios accentuated these differences. Oxide and roughness-induced crack closure had a significant effect on the near-threshold fatigue behavior of the conventional steel as a result of the inclusion-induced roughness on the fracture surface. Fractography and crack closure measurements were used to explain this behavior.

Author Information

Wilson, AD
Lukens Steel Company, Coatesville, Pa.
Price: $25.00
Contact Sales
Related
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Details
Developed by Committee: E08
Pages: 412–435
DOI: 10.1520/STP32567S
ISBN-EB: 978-0-8031-4900-7
ISBN-13: 978-0-8031-0208-8