Investigation of erosion-corrosion mechanisms of UNS S31603 using FIB and TEM

► FIB and TEM were used to investigate the subsurface wear of UNS S31603 during erosion-corrosion. ► Networks of cracks and folding of lips were observed in the material. ► The large strain imposed induced austenite to martensite phase transformation in certain areas. ► Fragmented erodent particles and oxide film were found embedded into the material. ► Physical models for subsurface wear are developed based on these observations.