Twinning activities in high-Mn austenitic steels under high-velocity compressive loading

摘要: Abstract High-velocity compression tests were carried out on three different types of high-manganese (Mn) austenitic steels, namely Hadfield, TWIP and XIP with the purpose favoring twinning over slip. The experiments conducted at temperatures: −170 °C, room temperature 200 °C, in order to cover both ductile brittle deformation ranges. Various mechanisms such as slip, formation more than one twin variant, nano-twins inside primary twins voids activated Hadfield steel, while was twin-dominated steel all temperatures, which stems from increase stacking fault energy (SFE) due higher Mn content. highest SFE, other hand, deformed mostly by slip elevated even though extensive nano-twin prevalent microstructure decreased temperature, then respectively. current set results lay roles velocity alloy content evolution high-Mn altogether can be tailored improve work hardening capacity this class materials.