Handbook of Case Histories in Failure Analysis
Superplastic HSLA Steels: Microstructure and Failure
This paper describes the superplastic characteristics of shipbuilding steel deformed at 800 °C and a strain rate less than 0.001/s. After the superplastic deformation, the steel presents mixed fractures: by decohesion of the hard (pearlite and carbides) and ductile (ferrite) phases and by intergranular sliding of ferrite/ferrite and ferrite/pearlite, just as it occurs in stage III creep behavior. The behavior is confirmed through the Ashby-Verrall model, according to which the dislocation creep (power-law creep) and diffusion creep (linear-viscous creep) occur simultaneously.
Sara Fernandez, María José Quintana, José Ovidio García, Luis Felipe Verdeja, Roberto González, José Ignacio Verdeja, Superplastic HSLA Steels: Microstructure and Failure, Handbook of Case Histories in Failure Analysis, Vol 3, Edited By Larry Berardinis, ASM International, 2019, p 445–452, https://doi.org/10.31399/asm.fach.v03.c9001816
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