Tensile Deformation of Alloy-22 at Ambient and Elevated Temperatures

Document Type

Conference Proceeding


Significant efforts are in progress to identify and characterize the tensile properties of structural materials for application in hydrogen generation using a thermochemical process known as the sulfur-iodine cycle. Austenitic Alloy-22 has been evaluated for its tensile properties at temperatures ranging from ambient to 1000°C. As expected, the tensile strength was gradually decreased with increasing temperature due to the ease of plastic deformation at these temperatures. However, the failure strain gradually decreased from room temperature to 600°C, possibly due to the occurrence of a phenomenon known as dynamic strain aging. Transmission electron microscopy revealed maximum dislocation density at 600°C. Fractographic evaluation of the tested specimens by scanning electron microscopy showed dimpled microstructures at the primary fracture surface indicating ductile failures. However, at higher temperatures intergranular brittle failures were observed.


Austenite; Steel alloys – Fatigue; Strains and stresses


Electro-Mechanical Systems | Heat Transfer, Combustion | Materials Science and Engineering | Mechanical Engineering | Mechanics of Materials | Metallurgy


Conference held: San Antonio, Texas, USA, July 22–26, 2007


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