Abstract：The hot ductility of 15-15Ti stainless steel for fuel assembly cladding tube of fast reactor was studied by Gleeble-3500 thermal simulation tester, the hot ductility curves was drawn, and the fracture and axial metallographic structure of all the tensile specimen were analyzed. The results show that 15-15Ti stainless steel has good hot ductility in the range of 900 ℃ ~ 1200 ℃at strain rate of 1s-1, and the percentage reduction of area were 82.2% ~ 98.9%, and reaches the maximum at 1150 ℃; The obvious necking phenomenon occurs in the process of hot tensile test of stainless steel, and the pores and dimples of tensile fracture became more and deeper with the temperature increasing. When the temperature reaches 1200 ℃, the dimple is still deep and the size slightly decreases; the dynamic recrystallization ratio of the tensile fracture of stainless steel increases with the increase of temperature, and complete dynamic recrystallization occurs at 1000 ℃ ~ 1200 ℃. When the strain rate is 1 s-1, the optimum hot working temperature of 15-15Ti stainless steel is 1000 ℃ ~ 1200 ℃.
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2020, Vol. 27 