Technical Paper
Surface Topography Changes Associated With Lüders Band Formation in Low Carbon Sheet Steels
2004-03-08
2004-01-0509
This research employed three-dimensional optical profilometry to examine the influence of yield point elongation (YPE) on the evolution of surface topography associated with Lüders band growth. Eleven Lüders bands were examined on tensile specimens containing YPE ranging from 0.13% to 2.34%. For each sample, a cycle of loading just beyond the yield point, unloading, recording surface topography changes, then repeating the process was undertaken. All samples were prepared by aging for various times at 150°C, chemically stripping the galvanized coating, and polishing one face to a mirror finish for surface topography assessment of the Lüders band. Assessments of the Lüders bands in the scan area revealed topography ranging from a ‘local’ maximum depth to a final condition reflecting residual features.