Published 06/27/2022 at 383 × 256 in EFFECTS OF B ON HIGH TEMPERATURE MECHA-NICAL PROPERTIES AND THERMAL FATIGUE BEHAVIOR OF COPPER DIE-CASTING DIE STEEL Fig.7 OM image of 3Cr10Mn7Ni6SiCuB0.7 after thermal fatigue testing for 300 cyc from room temperature to 800 ℃ Fig.7 OM image of 3Cr10Mn7Ni6SiCuB0.7 after thermal fatigue testing for 300 cyc from room temperature to 800 ℃