Influencing Factors of Bending Assessment Method for Intergranular Corrosion of Stainless Steels
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Graphical Abstract
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Abstract
The finite element method (FEM) based on GTN damage model was used to investigate the effects of mechanical properties of materials, bending angle and pressure head diameter on plastic strain distribution, ductile damage and crack initiation of bending specimens for assessing intergranular corrosion of stainless steels. The results show that the tensile plastic strain in the specimens increases with the increasing of bending angle and decreasing of pressure head diameter, and the specimens become easier to crack. For the fixed bending angle and pressure head diameter in the assessment standard for intergranular corrosion, cracks may initiate during bending for some stainless steels with lower plasticity, toughness and fracture resistance. So the effects of the mechanical properties of materials on the bending assessment results for intergranular corrosion should be considered. For the typical austenitic stainless steel in this study, when its bending fracture strain is less than about 0.51, cracks may occur during bending test. In this case, the bending method may not be suitable for assessing the intergranular corrosion of stainless steels.
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