A multiscale constitutive model for intergranular stress corrosion cracking in type 304 austenitic stainless steel

International Symposium on Dynamic Deformation and Fracture of Advanced Materials 2013

物理学;材料科学

Siddiq, A.^1,2 ; Rahimi, S.^1

Advanced Forming Research Centre (AFRC), 85 Inchinnan Drive, Glasgow, United Kingdom^1

Department of Design, Manufacture and Engineering Management, University of Strathclyde, Glasgow, United Kingdom^2

关键词: 304 austenitic stainless steels;    Cohesive zone modelling;    Critical environment;    Crystal plasticity theory;    Intergranular stress corrosion cracking;    Properties and microstructures;    Representative volume element (RVE);    Validation and verification;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/451/1/012022/pdf
DOI  :  10.1088/1742-6596/451/1/012022

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Intergranular stress corrosion cracking (IGSCC) is a fracture mechanism in sensitised austenitic stainless steels exposed to critical environments where the intergranular cracks extends along the network of connected susceptible grain boundaries. A constitutive model is presented to estimate the maximum intergranular crack growth by taking into consideration the materials mechanical properties and microstructure characters distribution. This constitutive model is constructed based on the assumption that each grain is a two phase material comprising of grain interior and grain boundary zone. The inherent micro-mechanisms active in the grain interior during IGSCC is based on crystal plasticity theory, while the grain boundary zone has been modelled by proposing a phenomenological constitutive model motivated from cohesive zone modelling approach. Overall, response of the representative volume is calculated by volume averaging of individual grain behaviour. Model is assessed by performing rigorous parametric studies, followed by validation and verification of the proposed constitutive model using representative volume element based FE simulations reported in the literature. In the last section, model application is demonstrated using intergranular stress corrosion cracking experiments which shows a good agreement.