摘要
This study analyzed the effect of cold-rolling reduction （in a wide range of 10% - 80% ） and subsequent annealing on the microstructure and mechanical properties of AISI 301LN stainless steel. Results indicated the formation of shear bands and nucleation of strain-induced α＇-martensite at their intersections. The volume fraction of α＇-martensite increased with increase in cold-rolling reduction by the continuous growth of embryos. This, in turn,resulted in an increase in yield and tensile strengths. The reversion of α＇-martensite to austenite occurred after subsequent annealing. The observed variation in the grain size of reversed austenite can be related to the annealing regime. A good combination of strength and ductility can be obtained upon annealing at 650 ℃ for 30 min. The effect of grain size on yield strength conformed to the Hall-Petch relationship in the entire range of our analysis.
This study analyzed the effect of cold-rolling reduction （in a wide range of 10% - 80% ） and subsequent annealing on the microstructure and mechanical properties of AISI 301LN stainless steel. Results indicated the formation of shear bands and nucleation of strain-induced α＇-martensite at their intersections. The volume fraction of α＇-martensite increased with increase in cold-rolling reduction by the continuous growth of embryos. This, in turn,resulted in an increase in yield and tensile strengths. The reversion of α＇-martensite to austenite occurred after subsequent annealing. The observed variation in the grain size of reversed austenite can be related to the annealing regime. A good combination of strength and ductility can be obtained upon annealing at 650 ℃ for 30 min. The effect of grain size on yield strength conformed to the Hall-Petch relationship in the entire range of our analysis.
基金
supported by the State 863 Projects of China under the grant No.2008AA030702
