|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Fatigue in Materials: Fundamentals, Multiscale Modeling and Prevention
||L-74: Effect of Laser Ablation Coating Removal (LACR) on the Fatigue Behavior of a Steel Substrate
||Md Shamsujjoha, Sean R. Agnew, James R. Brooks , James M. Fitz-Gerald
|On-Site Speaker (Planned)
The effect of laser ablation coating removal (LACR) on the fatigue performance of a DH36 steel was investigated and compared against abrasive blasting and conventional hand grinding. The fatigue life of LACR and hand-ground samples are similar, while abrasive-blasted samples show a slightly better fatigue life.The metal surface is melted and re-solidified during the LACR process.A high density of embedded abrasive blasting media was observed even after performing LACR and hand grinding. Stylus-based profilometry revealed that LACR reduced the roughness slightly, while hand ground samples exhibited significantly lower roughness values.X-ray diffraction-based measurements of the residual stress show that both LACR and hand grinding induce a tensile shift in the near surface region.SEM fractography revealed that fatigue cracks initiated from the surface defects (e.g. valleys of surface roughness, embedded media). The observed fatigue performance is attributed to the combined effects of surface damage and residual stress.
||Planned: Stand-alone book in which only your symposium’s papers would appear (indicate title in comments section below)