摘要
A 5 nm Ni-rich nanolayer has been introduced along nanoscale martensite/austenite phase boundaries(PBs) by one-step lowtemperature annealing treatment of cold-rolled meta-stable austenitic steels. Control experiments reveal that the martensitic phase transformation kinetics can be significantly altered by presence of the nanolayers. The growth of pre-existed martensites is substantially suppressed while the martensite nucleation in austenites is less affected, as revealed by a statistical investigation on the martensite size distribution under different tensile strains. Enhanced strength and excellent ductility have been achieved simultaneously in the annealed samples, demonstrating that PBs can be effectively engineered to achieve optimized mechanical properties.
A 5 nm Ni-rich nanolayer has been introduced along nanoscale martensite/austenite phase boundaries(PBs) by one-step lowtemperature annealing treatment of cold-rolled meta-stable austenitic steels. Control experiments reveal that the martensitic phase transformation kinetics can be significantly altered by presence of the nanolayers. The growth of pre-existed martensites is substantially suppressed while the martensite nucleation in austenites is less affected, as revealed by a statistical investigation on the martensite size distribution under different tensile strains. Enhanced strength and excellent ductility have been achieved simultaneously in the annealed samples, demonstrating that PBs can be effectively engineered to achieve optimized mechanical properties.
基金
supported by the National Natural Science Foundation of China(Grant Nos.11725210,11572281)
the Fundamental Research Funds for the Central Universities(Grant No.2018XZZX001-05)
