A Study on Mechanical Properties and Stress Corrosion Cracking of 304 Stainless Steel Fibers
|關鍵字:||應力腐蝕;304不□鋼;stress corrosion cracking;304 stainless steel|
In this study, the major experimental materials were 304 stainless steel fibers whose diameters were 40、50 and 70μm, respectively. Microstructure, mechanical properties and stress corrosion cracking would be researched.. Grain size of fibers was about 1~5μm. When the strain rate was faster, the ultimate tensile strength (UTS) would be higher and the ultimate tensile strength (UTS) could reach more than 900MPa. For stress corrosion cracking (SCC), dilute hydrochloric acid was used and the concentration were 0.6M, 0.8M, 1.6M；meanwhile, the failure time was different as the stress was changed. While the solution concentration was 0.6M or 1.6M, the curve of stress v.s failure time showed a linear tendency, but the nonlinear result was obtained from 0.8M. In higher temperature (40℃, 50℃), failure time were shorter because of higher reaction rate. Scanning electron microscopy (SEM) was used to investigate the fracture surface after tensile and SCC tests.