Mechanical properties and microstructure evolution of cold-deformed high-nitrogen nickelfree austenitic stainless steel during annealing

作者：Xu Mingzhou; Wang Jianjun; Liu Chunming^*

来源：Journal of Wuhan University of Technology-Materials Science Edition, 2012, 27(5): 830-835.

DOI：10.1007/s11595-012-0557-5

• annealing
• mechanical property
• microstructure
• twinning
• high nitrogen austenitic stainless steel

The mechanical properties and microstructure evolution of cold-deformed CrMnN austenitic stainless steel annealed in a temperature ranging from 50 A degrees C to 650 A degrees C for 90 min and at 550 A degrees C for different time were investigated by tensile test, micro hardness test, and Transmission Electron Microscope (TEM). The steel was strengthened when it got annealed at temperatures ranging from 100 A degrees C to 550 A degrees C, while it was softened when it got annealed at temperatures ranging from 550 A degrees C to 650 A degrees C. Annealing temperature had stronger effect on mechanical properties than annealing time. TEM observations showed that nano-sized precipitates formed when the steel was annealed at 150 A degrees C for 90 min, but the size and density of precipitates had no noticeable change with annealing temperature and time. Recrystallization occurred when the steel was annealed at temperatures above 550 A degrees C for 90 min, and its scale increased with annealing temperature. Nanosized annealing twins were observed. The mechanisms that controlled the mechanical behaviors of the steel were discussed.

• 出版日期2012-10
• 单位东北大学