Energy Materials 2017: Materials for Oil and Gas and AMREE Oil & Gas III: Harnessing Bulk Nanostructured Materials for Energy II
Sponsored by: Chinese Society for Metals
Program Organizers: Indranil Roy, Schlumberger; Chengjia Shang, University of Science and Technology Beijing

Monday 2:00 PM
February 27, 2017
Room: 14A
Location: San Diego Convention Ctr

Session Chair: Kripa Varanasi, MIT; Ting Chen, Massachusetts Institute of Technology

2:00 PM  Keynote
Potential of Crystal Defects for Enhancing Bulk Functional Nanomaterials: Michael Zehetbauer1; 1University of Vienna
    Top-down processing schemes like “Severe Plastic Deformation – SPD” revealed as most successful to achieve bulk nanostructured materials with excellent mechanical properties [1]. Now, scientists increasingly focus on SPD processing of functional nanomaterials like thermoelectrics, hydrogen storage materials, and biomedical alloys [2]. Significant enhancements have been reached in the efficiency of thermoelectrics, in the capacity and stability of hydrogen storage materials, and in mechanical and corrosion properties of biomedical alloys. However, these functional improvements have been induced by dislocations and/or vacancy clusters rather than by grain boundaries. Type and arrangement of these defects are essential for the optimization of functional properties, and seem feasible by combining certain SPD techniques and specific thermal treatments. Notes: [1] M.J. Zehetbauer, Y.T. Zhu (eds.), Bulk Nanostructured Materials, WILEY-VCH Weinheim, Germany (2009). [2] R. Z. Valiev, M. J. Zehetbauer, et al., Mater.Res.Lett. 4 (2016) 1-21. Acknowledgement: Work supported by Austrian Science Fund, project AI0281521

2:30 PM  Invited
Gradient Materials: Microstructure, Texture and Properties: Jordan Moering1; Xiaolei Wu2; Yuntian Zhu1; 1North Carolina State University; 2Institute of Mechanics, Chinese Academy of Sciences
    I will present and discuss the microstructure, texture, and properties of gradient materials processed by surface mechanical attrition treatment (SMAT). Gradient structures are characterized with macroscopic systematic change of microstructures such as grain size, texture and defect density. Recently gradient structures with grain size gradient from nano-scale to micro-scale were introduced into metals by SMAT, producing excellent strength and ductility. The material with a gradient structure has a built-in mechanical incompatibility during the tensile deformation, which generate geometrically necessary dislocations and back stress. The effect of textural gradient is superimposed on the grain size gradient and need to be further studied by theoretical modeling. Materials with gradient structures represent an emerging academic field with many fundamental and engineering problems to be solved by researchers from the communities of materials science and materials mechanics.

3:00 PM  Invited
High Temperature Shape Memory Alloys for Potential Applications in Oil and Gas Industry: Ibrahim Karaman1; 1Texas A&M University
    Shape memory alloys (SMAs) can generate higher or comparable work output than many conventionally available mechanical components used in aerospace, automotive, oil and gas industries as a consequence of the large amount of reversible shape changes they show under high applied loads. Recent challenges in oil and gas industries require improved operating efficiency of mechanical components at elevated temperatures (>100 oC) and high pressures where commercially available NiTi SMAs cannot be used above 100 oC. Recently, NiTiHf alloys have drawn a great attention as relatively inexpensive high temperature SMAs as compared to those with precious elements. In this talk, the current of state of art on the Ni-rich NiTiHf HTSMAs with an emphasis on their potential use in oil and gas industry will be discussed. The experimental results as a function of microstructure will be compared and discussed along with the current challenges and industrial opportunities.

3:30 PM Break

3:50 PM  Keynote
The Microstructural Origin of the Multifunctional Properties of Energy Metals: Niels Hansen1; 1Technical University of Denmark
    Energy materials must be multifunctional whether the application is in the oil and gas, coal or wind energy sector. The multifunctionality encompasses strength, formability and resistance to erosion and corrosion. High performance energy materials are typically nanostructured metals and alloys in bulk form, as thin surface layers or a combination. In the lecture, design and processing of high performance metallic materials will be discussed based on an analysis of the microstructural origin of the mechanical, physical and chemical properties of energy metals for engineering applications.

4:20 PM  
Effect of Severe Plastic Deformation (SPD) Surface Treatment on Corrosion Resistance and Environmental Cracking (EC) Susceptibility of Various Alloys: Ting Chen1; Manasa Varanasi1; Kripa Varanasi1; 1Massachusetts Institute of Technology
    The effects of severe plastically deformed (SPD) surface treatment techniques on corrosion and environmental cracking (EC) resistance of super-alloy 718 and stainless-steel 17-4PH were investigated. High frequency hammer peening and surface mechanical attrition (SMA) techniques were applied to plastically deform sample surfaces of alloys 718 and 17-4 PH. Electrochemical tests performed on untreated and SPD processed alloy 718 in corrosive drilling fluids indicate that SPD abets its performance in hostile environments. To assess its EC susceptibility, SPD processed 17-4PH C rings stressed to 90% of its yield-strength were exposed to HPHT sour environment having significantly more hydrogen sulphide (H2S) than MR0175 recommended limit for the alloy. In contrast to untreated alloy, SMAT treated samples did not suffer EC due to compressive residual stresses introduced by SPD offsetting tensile component. In light of these results effect of SPD and their subsequent corrosion / EC performance on several light alloys are discussed.

4:50 PM  
Processing Aluminum 6061 by Equal Channel Angular Extrusion for Oil and Gas Applications: Ramatou Ly1; Karl T. Hartwig1; Homero Castaneda-Lopez1; 1University Texas A&M
    Equal channel angular extrusion (ECAE) is a severe plastic deformation process by which high strength nanostructured aluminum 6061 is formed. By changing the extrusion parameters and heat treatment conditions, the material texture, mechanical properties and corrosion resistance can be modified. Over the last two decades much has been done on aluminum 6061 to increase the strength by the ECAE process. Our research explores the potential use of high strength extruded aluminum 6061 in replacement of common 6061-T6 for the Oil and Gas field. As the ECAE process changes the microstructure, the texture and the kinetic precipitation of the extruded material, we focused our interest on the grain boundary precipitation and degradation for different combinations of ECAE process parameters ageing time and temperature. Grain boundary characteristics are studied by microstructure analysis (EBSD, SIMS). Intergranular corrosion testing is used to assess the extent of grain boundary degradation.