Environmentally Assisted Cracking: Theory and Practice: Corrosion and Degradation in Harsh Environments II
Sponsored by: TMS Structural Materials Division, TMS: Corrosion and Environmental Effects Committee
Program Organizers: Bai Cui, University of Nebraska Lincoln; Raul Rebak, GE Global Research; Srujan Rokkam, Advanced Cooling Technologies, Inc.; Jenifer Locke, Ohio State University
Thursday 10:00 AM
March 3, 2022
Room: 201D
Location: Anaheim Convention Center
Session Chair: Srujan Rokkam, Advanced Cooling Technologies; Fei Wang, University of Nebraska Lincoln
10:00 AM
Composition and Morphology of C1018 Carbon Steel Coupons Retrieved from High Temperature Water Injection Well: Mohammad Haque1; Rajesh Saini1; Khaled Al-Muhammadi2; Ahmed Bukhamseen2; 1Aramco Services Company; 2Saudi Aramco
Formation of sulfide (FeS), oxides (FeO, Fe2O3, Fe3O4) and/or carbonates (FeCO3) of iron during corrosion of tubing materials in a water well is a common phenomenon. Composition of water, tubing metallurgy, pressure, temperature and fluid flow velocity influence such formation impacting the mechanical integrity of the well-tubing. A downhole coupon holder containing two low carbon steel (C1018) flat metal coupons has been deployed in a water injection well (80 °C) for three months to evaluate the metallurgy. Change in weight, surface profilometry, scanning electron microscopy and X-ray fluorescence spectroscopy techniques were used to characterize the retrieved coupons. Embrittlement and cracking as well as uniform surface corrosion were observed due to low water pH and presence of H2S. Pits were randomly initiated from the pre-formed holes edges under stress causing severe stress cracking. Detailed coupons study has enabled a better understanding of the downhole damages supporting an effective corrosion mitigation strategy.
10:20 AM
Sensitization Responses along Different Directions of 5XXX Series Aluminum Alloy Plate Microstructures: Matthew Steiner1; Likun Sun1; Syeda Noor E Sumaiya1; 1University of Cincinnati
The extent of intergranular corrosion in sensitized 5XXX series aluminum alloy plates is highly dependent on the exact geometric configuration of networked high-angle grain boundaries available for propagation normal to the exposed surface. Utilizing adaptations of the Nitric Acid Mass Loss Test (NAMLT) standard commonly used to assess bulk sensitization in these alloys, we will present the isolated directional intergranular corrosion responses from different rolled plate microstructures as a function of their time-temperature history. We will show how both the magnitude and kinetics of the directional sensitization responses exhibited by these microstructures contributes to variations in the bulk measurements of nominally identical 5XXX series aluminum alloy plates, despite their shared alloy-temper designation. Lastly, we will highlight how the directional sensitization responses correlate with features of the grain boundary configurations in ways that render the microstructural data predictive of the intergranular corrosion behavior, with direct implications to stress corrosion cracking.
10:40 AM Invited
NOW ON-DEMAND ONLY - Physics-based Modeling of Corrosion Crack Dynamics and Fracture: A Case for Meshless Peridynamics Approach: Srujan Rokkam1; Masoud Behzadinasab2; Max Gunzburger3; Sachin Shanbhag3; Nam Phan4; 1Advanced Cooling Technologies, Inc.; 2Brown University; 3Florida State University; 4Naval Air Systems Command
Environmental assisted corrosion cracking is a major cause for structural damage in many engineering applications. In this work, we discuss a Peridynamic (PD) approach for physics-based modeling of corrosion damage phenomena which can be applied to model crack growth and failure due to either stress corrosion cracking (SCC) or corrosion fatigue (CF). PD approach is a reformulation of classical computational mechanics that enables modeling of crack growth problem without the need to re-mesh the domain. The presentation will focus on two aspects: (i) how multiphysics aspects of corrosion damage can be modeled using nonlocal PD approach, (ii) demonstration of corrosion crack dynamics in surrogate aluminum alloys. The developed framework is able to capture ductile damage behavior as well crack path dynamics without the drawbacks of conventional theories. This work was funded by U.S. Navy/NAVAIR through STTR program, Contract N68335-15C-0032, awarded to Advanced Cooling Technologies, Inc. The simulations used NSF-XSEDE allocation grants DMR180017.