Surface modification of mild steel using a combination of laser and electrochemical processes

摘要: Traditional methods for achieving hierarchical surface structures include highly specified, deterministic approaches to create features meet design intention. In this study microstructural alteration was undertaken using laser apparatus and secondary texturing achieved via succeeding electrochemical processes. Electrochemical jet machining (EJM) performed on mild steel subjected pre-treatment power densities of 4167 5556 W/cm2 with pulse durations from 0.3 - 1.5 seconds. Results show that in combination, EJM can alter the exposed textures chemistries. Here, machined roughness (Sa) shown increase approximately 0.45 µm untreated surfaces 18 extreme pretreatments. After pre-treatments materials were characterised appraise changes, be martensite formation, reinforced by complementary simulation data, significant increases observable hardness 261 HV asreceived material over 700 after pre-treatment. The greater retained EJM. Exposed martensitic lath at are partially responsible increases. explored energy dispersive X-ray spectroscopy (EDS) Raman demonstrating changes apparent chemistry. This analysis revealed increasing oxide formation pre-treated surface, a further contributory factor new process chain will interest manufacturers seeking control morphology applications including micro-injection mould/die manufacture. While demonstrated here similar mechanisms exploitable other systems. A technique has been demonstrated, resulting models processes presented couple electrolyte processing complex preparation.