SEDL / STP / STP668-EB / STP35844S

Characterization of Plate Steel Quality Using Various Toughness Measurement Techniques

Wilson, AD
Research engineer, Lukens Steel Company, Coatesville, Pa.

Pages: 24    Published: Jan 1979

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Abstract

The fracture toughness properties of three steels (A516-70, A533B Class 1, and HY-130) are determined in two steel-quality levels (conventional and calcium treated). In addition, a conventional quality A543B Class 1 steel is similarly examined at two locations (quarterline and centerline). Both investigations involved comparing steels with differing inclusion structures. The primary effort was to establish the upper-shelf toughness differences found using the Charpy V-notch impact and dynamic tear tests compared with those found using J-integral determinations of J^Ic and K^Ic. The J^Ic determinations appeared to be more sensitive to changes in inclusion structure than either the Charpy V-notch or dynamic tear tests. This was established by comparing the toughness between quality levels and by measuring the anisotropy of toughness within a steel. Comparisons are made with the Charpy V-notch impact-K^Ic upper-shelf correlation values. Comments concerning the suggested graphical method for J^Ic determination are also given.