Design of a novel creep testing machine to investigate the creep life history of austenitic steel foil at elevated temperature
Document Type
Article
Publication Date
9-1-2022
Abstract
A novel creep testing machine was designed to test austenitic steel foil AISI 347 under the elevated temperature of 700 degrees C. The creep test was repeated in five stress levels from low-stress 55 MPa to severe applied stress 220 MPa for 0.25 mm thickness samples. The machine was equipped with a shield inert gas injection system, and tests were repeated in a nonoxidative area. The creep rupture behavior of the foil is well represented using the modified threeparameter Theta Projection Concept model. Each model parameter is best represented as a function of the applied stress. Comparison between the results of creep life in different mediums shows that the oxidation effect was the dominant phenomenon in the creep process. Moreover, avoiding oxidation affects the steady-state stage growth, and afterward, the creep life was increased by more than 40%. Post analyses of ruptured creep samples compare the creep cavitation at triple grain boundaries in a different environment.
Keywords
Austenitic steel foil, Creep deformation, Elevated temperature, New creep testing machine, Shielding inert gas, Theta projection model
Divisions
fac_eng
Funders
European Union (EU) [CZ.02.1.01/0.0/0.0/16_025/0007293],Ministry of Education, Youth & Sports - Czech Republic
Publication Title
Fatigue & Fracture of Engineering Materials & Structures
Volume
45
Issue
9
Publisher
Wiley
Publisher Location
111 RIVER ST, HOBOKEN 07030-5774, NJ USA