EBSD Data of Nanoindentation Maps around Chloride-induced Stress Corrosion Cracks in Austenitic Stainless Steel 304L Welds
This dataset presents SEM-EBSD data collected on nanoindentation maps around chloride-induced stress corrosion cracks (CISCC) in a gas tungsten arc welded (GTAW) austenitic stainless steel (AuSS) 304L. The experimental setup involved a welded stainless steel 304L coupon of dimensions 105 mm × 18.5 mm × 3 mm, loaded in a 4-point bending fixture with a maximum tensile stress of 380 MPa. The fixtured specimen was immersed in boiling magnesium chloride (MgCl2) solution until a through-crack was observed on the specimen surface after 17 hours of boiling. The cross-section was subsequently polished, and 5 cracks of interest in the heat affected zone (HAZ) were selected for nanoindentation and SEM-EBSD characterization. Nanoindentation testing was carried out on the cross-section of the specimen with a KLA iMicro Nanoindenter under displacement-control mode. The nanoindenter utilized a diamond Berkovich tip with an elastic modulus of 1141 GPa. Nanoindentation grits of 1000 nm depth and 50 µm spacing were applied around 5 CISCC cracks (Crack #1 - #5) in the HAZ. Nanohardness and modulus were calculated based on the Oliver-Pharr method. Nanoblitz is performed on 3 additional crack zones (Crack #6 - #8). Scanning electron microscopy (SEM) based electron backscatter diffraction (EBSD) was used to map the grain structure around the nanoindentation maps. The obtained orientation imaging microscopy (OIM) datasets were post-processed using EDAX OIM V8 proprietary software to generate inverse pole figures (IPF), image quality (IQ) figures, detector signal (SEM) images. This dataset can be used to understand CISCC crack initiation, propagation, and termination behaviors, as has been reported in the accompanying original research article. This dataset provides the raw EBSD OIM datasets and processed images formatted for accessibility in future studies.