| Damping capacity and hardness were investigated with respect to deformation degree for an austenitic stainless steel (STS 304L). The damping capacity showed the maximum values at 10% and 20% in reduction of thickness for the room temperature and the liquid nitrogen temperature specimens, respectively. It was considered that the main damping source of the austenitic stainless steel was the stacking fault boundary which consists of partial dislocations in austenite. The specimens cold-rolled at room temperature exhibited higher hardness than the specimens cold-rolled at liquid nitrogen temperature at the same amount of α` martensite. This suggested that hardening for room temperature rolling was attributed to α` martensite, stacking fault, and dislocation in austenite formed during deformation, and that strain hardening for liquid nitrogen temperature rolling was caused by α` martensite and stacking fault in austenite produced during deformation. After the specimens that had been cold-rolled were aged below As temperature, the hardness increased at all deformation degrees. After aging, the damping capacity decreased at low deformation degrees, but didn`t change at high deformation degrees. |
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