Microstructure nanostructuring and mechanical properties of304 stainless steel containing copper

doi:10.13251/j.issn.0254-6051.2025.05.016

Abstract

Abstract: Microstructure of the 304 stainless steel containing copper was nanocrystallized by cryogenic rolling and isothermal annealing, and the microstructure evolution and its effect on mechanical properties during isothermal annealing were studied. The results indicate that when the cryogenic-rolled experimental steel is annealed at 800 ℃ for 2,3, 4, and 10 min, respectively, the average grain size is 315, 552, 648 and 1320 nm. There are a large number of dispersed nano-size Cu-rich phases in the nano/ultrafine-grained structure prepared by isothermal annealing at 800 ℃ for 2 min, and there are also some larger Cr-rich carbide precipitates with the annealing time extended to 10 min. Compared with the nano-grained structure prepared by annealing at 800 ℃ for 10 min, the nano/ultrafine-grained structure prepared by annealing at 800 ℃ for 2 min imparts the steel with higher strength and better ductility, with yield strength and tensile strength of 828 MPa and 980 MPa, respectively, and total elongation at fracture of 33.1%.

Key words: 304 stainless steel containing copper, Cu-rich phase, grain refinement, cryogenic rolling, annealing, mechanical properties

CLC Number:

TG178

Zhao Miaomiao, Du Linxiu, Cao Yi, Huang Yan. Microstructure nanostructuring and mechanical properties of304 stainless steel containing copper[J]. Heat Treatment of Metals, 2025, 50(5): 101-106.

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