A study on crack healing in 1045 steel

This study aims to investigate the healing method of internal cracks in 1045 steel. Real internal cracks were produced in 1045 steel specimens using plate impact technology successfully. A quasi in situ observation under scanning electron microscope and ultrasonic scanning was performed to investigate the behaviour of crack healing. After 120 min heat treatment at 1100 °C, the crack healing at crack tips was achieved. However, micro-voids were left in crack healing area and the edges of the remnant micro-voids were very smooth.