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Modeling Stress Corrosion Cracking With Explicit 3D Grain Microstructure

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Stress corrosion cracking (SCC) of Type 304 stainless steel (304 SS) in elevated temperature (288 °C) high purity water is typically an intergranular (IG) process with cracks propagating along grain boundaries, which are mesoscopic entities relevant on the grain scale. It follows then that the nature of the grain boundaries plays a significant role in SCC. In fact, for IG SCC to occur three things must be present: 1) stress; 2) a corrosive environment; and 3) susceptible grain boundaries. SCC growth rate (SCCGR) equations for 304SS in high temperature, high purity water, test orientation, temperature, material composition, and sensitization.

Product Number: ED22-17160-SG
Author: Benjamin S Anglin, Thomas W Web
Publication Date: 2022
$20.00
$20.00
$20.00

Models of stress corrosion cracking are conventionally statistical fits to empirical stress corrosion cracking growth rate databases or a one dimensional physically based model accounting for far field loading conditions and macroscopic material properties, yet it is reasonable to think local conditions dictate intergranular cracking behavior. For example, coincident site lattice twin boundaries in face centered cubic metals are resistant to intergranular stress corrosion cracking. Moreover, it is known that cold work promotes stress corrosion cracking, yet the deformation is not distributed equally throughout the microstructure. This work explores the relationship between deformation near grain boundaries resulting from far field imposed cold work and subsequent modeling of stress corrosion cracking with an explicit three-dimensional grain microstructure through elementary crystal plasticity constitutive and stress corrosion cracking models. A spectral based crystal plasticity simulation technique is the key enabler for such large-scale explicit microstructure sensitive modeling of stress corrosion cracking. Realistic three-dimensional intergranular stress corrosion crack morphologies will be presented as a result of this technique.

Models of stress corrosion cracking are conventionally statistical fits to empirical stress corrosion cracking growth rate databases or a one dimensional physically based model accounting for far field loading conditions and macroscopic material properties, yet it is reasonable to think local conditions dictate intergranular cracking behavior. For example, coincident site lattice twin boundaries in face centered cubic metals are resistant to intergranular stress corrosion cracking. Moreover, it is known that cold work promotes stress corrosion cracking, yet the deformation is not distributed equally throughout the microstructure. This work explores the relationship between deformation near grain boundaries resulting from far field imposed cold work and subsequent modeling of stress corrosion cracking with an explicit three-dimensional grain microstructure through elementary crystal plasticity constitutive and stress corrosion cracking models. A spectral based crystal plasticity simulation technique is the key enabler for such large-scale explicit microstructure sensitive modeling of stress corrosion cracking. Realistic three-dimensional intergranular stress corrosion crack morphologies will be presented as a result of this technique.

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