About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
Presentation Title |
Coupled Analysis of Stress and Deformation Behavior in Transgranular Stress Corrosion Crack Tip Plasticity in Austenitic Stainless Steel |
Author(s) |
Haozheng Qu, Rebecca Schaller, Eric Schindelholz, Janelle Wharry |
On-Site Speaker (Planned) |
Haozheng Qu |
Abstract Scope |
The objective of this study is to understand crack tip plasticity around transgranular chloride-induced stress corrosion cracks (TGCISCC) in austenitic stainless steel. TGCISCC is a critical degradation pathway for steels, but the micromechanisms of its propagation are not well understood. Here, 304L coupons loaded in four-point bending fixtures are immersed in boiling MgCl2 at 155°C to initiate CISCC. Strain distributions and microstructure around the crack tips are analyzed using high-resolution electron backscatter diffraction (HR-EBSD) and transmission electron microscopy (TEM). Stacking faults and dislocations are observed along the crack path and in grains ahead of crack tips. Shear stress concentrates in cracked grains, whereas tensile stress concentrates in uncracked surrounding grains. The different deformation behaviors in cracked grains and ahead of crack tip will be discussed in connection with the strain and stress analysis.
SNL is managed and operated by NTESS under DOE NNSA contract DE-NA0003525. SAND2022-8992 A. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Environmental Effects, Iron and Steel |