| Title |
Temperature Effect on the Cyclical Non-Stabilization of Type 316L Stainless Steel during Low-Cycle Fatigue Deformation: Cyclic Stress Response and a Suitable Fatigue Parameter |
| Authors |
홍성구(Seong Gu Hong); 이순복(Soon Bok Lee) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
Cyclic stress response; Non-stabilization; Dynamic strain aging; Plasticity-induced martensite transformation; Fatigue parameter; 316L stainless steel |
| Abstract |
In this study, cold worked (CW) 316L austenitic stainless steel was investigated by performing low-cycle fatigue test with varying temperature, strain amplitude, and strain rate. CW 316L stainless steel underwent additional hardening at room temperature and in the temperature range of 250-600℃: The hardening at room temperature came from plasticity-induced martensite transformation, and the hardening over 250-600℃ was attributed to dynamic strain aging. These hardening mechanisms competed with the softening mechanism which was induced by dynamic recovery, generally observed in cold worked materials, resulting in the cyclical non-stabilization of the material. Three fatigue parameters, such as stress amplitude, plastic strain amplitude, and plastic strain energy density, were evaluated. The results revealed that plastic strain energy density was nearly invariant through a whole life and, thus, recommended as a suitable fatigue parameter. (Received September 3, 2004) |