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Effect of annealing temperature on microstructure and properties of ferritic stainless steel 441 |
WU Min1,2, LI Guo-ping2, ZOU Yong2, WANG Li-xin2, WEI Ying-hui1 |
1. College of Materials Science and Engineering, Taiyuan University of Tenchnology, Taiyuan 030024, Shanxi, China; 2. State Key Laboratory of Advanced Stainless Steel, Taiyuan Iron and Steel (Group) Co., Ltd., Taiyuan 030003, Shanxi, China |
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Abstract To explore the microstructure evolution and mechanical properties of 441 ultra-purified ferritic stainless steel during annealing,441 hot-rolled plates were annealled at 900-1 050 ℃,and the microstructure were characterized by OM,SEM and TEM. The effects of annealing temperature on mechanical properties were studied by tensile test and impact test. The results show that the rolling structure recrystallizes and the grains grow gradually with increasing annealing temperature. There are three precipitates in 441 hot-rolled-annealed plate,primary (Ti,Nb)(C,N),secondary Nb(C,N) and Laves phase. A large number of Laves phase,with the size of hundreds nanometers,precipitates in samples annealed at 900-950 ℃. As the annealing temperature increases,the yield strength of 441 firstly decreases and then increases,the tensile strength decreases gradually,while the elongation increases continually. Deformation strengthening has the greatest contribution to the yield strength,followed by solution strengthening and precipitation strengthening. The impact test indicates that 441 plate has the lowest ductile to brittle transition temperature after annealing at 1 000 ℃,and Laves phase and grain growth are detrimental to the impact toughness of this material.
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Received: 20 April 2020
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