Hot deformation of Nb-bearing austenitic stainless steel has been studied at temperatures from 823 to 1 173 K at an initial strain rate of 2. 1 multiplied by 10** minus 4 s** minus **1. Although yield strength of the solution-treated specimen was low, work hardening occurred at 1 023 to 1 123 K. A large ductility trough accompanied by intergranular ductile fracture is explained in terms of dynamic precipitation of NbC within the grains as well as on grain boundaries. In the aged specimen, yield strength was larger and work hardening was less significant. High strength is explained in terms of small grains formed by stacking faults where NbC particles precipitated. Above 1 123 K ductility of the solution-treated specimen increased with increasing deformation temperature, but that of the aged specimen was reduced. Ductility loss is ascribed to crack formation along coherent twin boundaries.
|ジャーナル||Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan|
|出版ステータス||Published - 1985 6月|
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