CASE INST OF TECH CLEVELAND OH METALS RESEARCH LAB
The eccentric notch tensile test previously employed in exploring the relative ductility at the midthickness level of A and C steel the designations A and C refer to steels A and C in the series of Ship Structure Committee Project Steels weldments has been applied to an evaluation of the ductility at the surface level and at various positions in the weld metal of a C steel weldment. The surface tests at various low temperatures located a zone of low ductility at a distance of 0.4 inch from the weld centerline of 34 inch plate. This zone was outside the so-called heat affected zone and appeared to have the same metallographic structure as the base plate. These findinggs are in agreement with those previously reported at the midthickness level of both A and C steel weldments. Low temperature probe tests in the weld metal failed to detect any zones of low ductility. Data are presented comparing the notched eccentric and concentric and unnotched tensile properties at the midthickness level of an A steel weldment. Low temperature tests revealed that the concentric notch ductility varied across the welded plate in the same manner as the eccentric notch strength, thus confirming that the eccentric notch strength is a measure of notch ductility. The variation in concentric notch strength and unnotched tensile properties across the welded plate failed to detect zones of low ductility in the subcritically heated plate. The eccentric notch tensile test is not unique in defining a region of minimum ductility in the subcritically heated parent plate.
Progress rept. no. 3, 1 Jul 49-1 Jan 50,
Prepared in cooperation with Committee on Ship Structure, National Research Council, Contract NObs-50148.