Mechanical Behaviours of Alloy 617 with Varied Strain Rate at High Temperatures

Calmunger, MattiasLinköpings universitet,Konstruktionsmaterial,Tekniska högskolan (author)

Nickel-base alloys due to their high performances have been widely used in biomass and coal fired power plants. They can undertake plastic deformation with different strain rates such as those typically seen during creep and fatigue at elevated temperatures. In this study, the mechanical behaviours of Alloy 617 with strain rates from 10-2/s down to 10-6/s at temperatures of 650°C and 700°C have been studied using tensile tests. Furthermore, the microstructures have been investigated using electron backscatter detection and electron channeling contrast imaging. At relatively high strain rate, the alloy shows higher fracture strains at these temperatures. The microstructure investigation shows that it is caused by twinning induced plasticity due to DSA. The fracture strain reaches the highest value at a strain rate of 10-4/s and then it decreases dramatically. At strain rate of 10-6/s, the fracture strain at high temperature is now smaller than that at room temperature, and the strength also decreases with further decreasing strain rate. Dynamic recrystallization can also be observed usually combined with crack initiation and propagation. This is a new type of observation and the mechanisms involved are discussed.

Chai, GuocaiLinköpings universitet,Konstruktionsmaterial,Tekniska högskolan,Sandvik Materials Technology, Strategy research, SE-81181 Sandviken, Sweden(Swepub:liu)guoch17 (author)
Johansson, StenLinköpings universitet,Konstruktionsmaterial,Tekniska högskolan(Swepub:liu)stejo02 (author)
Moverare, JohanLinköpings universitet,Konstruktionsmaterial,Tekniska högskolan(Swepub:liu)johmo31 (author)
Linköpings universitetKonstruktionsmaterial (creator_code:org_t)

In:Materials Science Forum: Trans Tech Publications Ltd783-786, s. 1182-1187, s. 1182-11870255-54761662-9752
In:THERMEC 2013: Trans Tech Publications Ltd783-786, s. 1182-1187, s. 1182-11879783038350736

By the author/editor: Calmunger, Matti ...; Chai, Guocai; Johansson, Sten; Moverare, Johan

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