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

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Abstract

The mechanical properties and microstructure evolution of cold-deformed CrMnN austenitic stainless steel annealed in a temperature ranging from 50 °C to 650 °C for 90 min and at 550 °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 °C to 550 °C, while it was softened when it got annealed at temperatures ranging from 550 °C to 650 °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 °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 °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.

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Correspondence to Chunming Liu  (刘春明).

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Funded by of Liaoning Science and Technology Bureau(No.2007221007)

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Xu, M., Wang, J. & Liu, C. Mechanical properties and microstructure evolution of cold-deformed high-nitrogen nickelfree austenitic stainless steel during annealing. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 27, 830–835 (2012). https://doi.org/10.1007/s11595-012-0557-5

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  • DOI: https://doi.org/10.1007/s11595-012-0557-5

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