High Temperature Alloys Committee

Technical Programming

2018 TMS Annual Meeting & Exhibition: Deformation and Damage Mechanisms in High Temperature Ni, Co and Fe-based Superalloys: Organized by Mark Hardy; Kevin Bockenstedt; Chantal Sudbrack; Michael Titus; Kinga Unocic; Yukinori Yamamoto

Ni-, Co- and Fe-based superalloys are enabling materials for the design of high-temperature components for aerospace propulsion, chemical processing, oil and gas applications, and power generation. They retain superior strength at elevated temperatures, and show excellent damage tolerance, toughness, long-term stability and resistance to creep accumulation and environmental damage. The performance of these alloys is often improved when formed to optimize microstructure or used in conjunction with surface treatments and coatings or with novel design solutions. The aim of the symposium is to discuss the mechanisms of deformation and damage in the manufacture and application of high temperature Ni, Co and Fe based superalloys. It is proposed that the technical focus is on the understanding: - Roles of deformation and heat treatment on the evolution of microstructure during material processing - Effects of deformation from manufacture on material and component behavior - Mechanisms of deformation that determine material behavior - Development of deformation that gives rise to damage during material application - Effects of composition and microstructure on resistance to deformation and damage accumulation Topics of interest may include (but are not limited to): - Elevated temperature forging, recrystallization, grain growth, flow forming, machining and shot peening - Experimental observation of deformation and damage accumulation - Constitutive and computational modeling of deformation - Mechanisms of ambient and elevated temperature plasticity, creep, fatigue, creep-fatigue, crack growth and environmental damage

9th International Symposium on Superalloy 718 and Derivatives: Superalloy 718 and Derivatives: Energy, Aerospace & Industrial Applications: Organized by Xingbo Liu; Kevin Bockenstedt; Ian Dempster; Chantal Sudbrack; Joel Andersson; Paul Jablonski; Eric Ott; Max Kaplan; Jon Groh; Karl Heck; Zhongnan Bi; Daisuke Nagahama

Recent innovations in alloy research, along with novel processing techniques, continue to extend their applications in very challenging environments—ranging from corrosion resistance in the deep sea to extreme temperature, radiation, and pressure resistance in space applications. Technical presentations are carefully and stringently curated to ensure the highest quality programming at Superalloy 718 & Derivatives. This conference will provide an opportunity for authors to present technical advancements relative to a broad spectrum of areas while assessing their impact on related fields associated with this critical alloy group. This conference is more industrially focused than other superalloys conferences, with technical topics focusing on alloy and process development, production, product applications, trends, and the development of advanced modeling tools. New developments in R&D, new processing methods, 3D printing, and other nontraditional applications will also be covered in the program. Technical coverage at this conference will include: - Alloy 718 - Superalloys - High Temperature Fe-, Ni-, and Co- Alloys - Casting - Forging - Powder & Additive Manufacturing - Modeling - Oil & Gas - Land Based Power Generation - Aerospace - Chemical Processing

2017 TMS Annual Meeting & Exhibition: Additive Manufacturing of Metals: Establishing Location-Specific Processing-Microstructure-Property Relationships: Organized by Eric Lass; Judy Schneider; Mark Stoudt; Lee Semiatin; Kinga Unocic; Joseph Licavoli; Behrang Poorganji

Advancements in additive manufacturing technology have created the ability to design and construct parts with geometries and properties that cannot be achieved through traditional solidification and deformation processes. This ability has promoted new design strategies whose success relies on close integration of engineering and materials science. Tailoring specific material properties in low-volume production is of particular interest. In principle, engineers can now ‘print’ complex 3-dimensional shapes with internal features that can be optimized to meet a wide range of operational constraints and service conditions. An additional attractive aspect of additive processing is the ability to custom design specific properties within the component by layering, thereby promoting different microstructures or compositions (e.g., functionally-graded materials). The repetitive rapid melting and solidification that occurs during the fabrication process is dominated by transient phenomena, which can create unexpected variations in the composition and performance of the component. Thus, establishing an understanding of this process and its effect on properties requires integrating a variety of computational and experimental methods across a various length and time scales. This includes detailed 3-dimensional characterization as well as numerical modeling of thermodynamics kinetic phenomena. The transient nature of the rapid solidification can result in non-equilibrium phases, which result in properties which differ from materials fabricated by conventional processes. The main objective of this symposium is to develop a better understanding of the input-material requirements, process capabilities, and their effects on finished product properties. Research that elucidates the process-structure-property relationships resulting from rapid solidification and transient phase transformations is greatly needed. Abstracts are requested that relate transient phenomena, recrystallization, transformation, and rapid solidification to additive manufacturing and its influence on phases, microstructure, and mechanical properties.

2017 TMS Annual Meeting & Exhibition: Gamma (FCC)/Gamma-Prime (L12) Co-Based Superalloys II: Organized by Eric Lass; Qiang Feng; Alessandro Moturra; Chantal Sudbrack; Michael Titus; Wei Xiong

The first report of a stable \\947;’-L12 phase in the ternary Co-Al-W system in 2006 has given rise to significant research on a new class of precipitation strengthened alloys, analogous to Ni-based superalloys, which are most often utilized in high temperature turbine engine components. These materials exhibit a yield stress anomaly similar to their Ni-based counterparts, where the yield strength increases with temperature, demonstrate promising high temperature flow stress behavior and creep resistance, outstanding wear resistance, and potentially better castability. However, some challenges still exist in the development of future industrially relevant Co-based \\947;’ strengthened alloys, including increasing \\947;’ solvus temperature, improving environmental resistance, and decreasing component weight critical to many turbine engine applications. This symposium continues in the tradition of the first TMS symposium on \\947;-\\947;’ Co-based superalloys held in 2014, and will bring together the growing community of researchers involved with further understanding and developing \\947;’ strengthened Co-based superalloys for high temperature and other applications. Experimental and computational investigations on Co- and Co-Ni-based alloys that focus on understanding materials response, use ICME-based approaches, and aid in rapid alloy development will be highlighted. Topics of interest include: strategies for increasing the \\947;’ solvus temperature, improving environmental resistance, evaluating high temperature mechanical performance, assessing phase stability and phase transformation mechanisms, and advancing processing methods of these promising new materials.

2017 TMS Annual Meeting & Exhibition: Materials for High Temperature Applications: Next Generation Superalloys and Beyond: Organized by Akane Suzuki; Martin Heilmaier; Pierre Sallot; Stephen Coryell; Joseph Licavoli; Govindarajan Muralidharan

Nickel-based superalloys possess excellent combination of mechanical properties and environmental resistance at elevated temperatures, and they have been widely used in challenging environments such as aircraft engines and land-based power generation gas turbines, as well as nuclear power and chemical plants. The ever-increasing demand for higher operating temperatures to achieve better fuel efficiency has been driving the development of the next generation of superalloys, in which the higher temperature capability has been achieved by increasing additions of refractory elements, optimizing processing conditions and application of coatings. However, there has been a strong need of materials that can make a significant change in temperature capability beyond Ni-base superalloys. Refractory metal-based alloys and refractory metal-based intermetallics have been recognized as strong candidate materials. The goals of this symposium are to discuss recent progress in development of high temperature material systems that can offer capabilities beyond Ni-base superalloys and to understand their latest status, entitlement and limitations, as well as to understand current challenges that Ni-base superalloys are facing. The topics for discussion include thermodynamics, microstructural design and long term stability, processing, physical properties, mechanical behavior, and environmental resistance of (1) current and next generation Ni-base superalloys, (2) refractory metal based materials, (3) intermetallic based materials, and (4) coatings.

2016 TMS Annual Meeting & Exhibition: Material Design Approaches and Experiences IV: Organized by Akane Suzuki; Ji-Cheng Zhao; Michael Fahrmann; Qiang Feng

This symposium is a continuation of three previous symposia on the same subject held at TMS annual meetings in 2001 (Indianapolis), 2006 (San Antonio) and 2012 (Orlando). In this regard, it serves as a periodic review of the state-of-the-art development on the subject. Like its predecessors, the symposium will bring together materials scientists and engineers who have developed successful alloys (that have found real applications) with those who are developing new materials design methodologies/tools. On the one hand, alloy developers from the industry will illustrate how some of the most successful alloys were developed, what tools were used, what property balance and trade-off were considered, and what tests were performed to bring the alloys to successful implementations. On the other hand, the methodology/tool developers will demonstrate what new tools have been developed and how these tools can be applied to alloy design. The interaction among the groups will bridge the gaps between them, thus accelerating the transition of new design tools to alloy developers. Covering both past experiences and new approaches – both experimental and computational, the symposium may also help identify some critical areas/needs in new methodologies/tools for the community to focus upon. One particular area of interest of this symposium is the age-old compromise between strength and ductility, and ways to optimize both.

2016 TMS Annual Meeting & Exhibition: Materials in Clean Power Systems IX: Durability of Materials: Organized by Sebastien Dryepondt; Peter Hosemann; Kinga Unocic; Paul Jablonski; Joseph Licavoli; Donna Guillen

Growing energy demand and increasing concerns regarding energy security and pollution emission have sparked worldwide research and development for clean and renewable power technologies. Such technologies include but are not limited to clean coal technologies, carbon capture, concentrated solar power, biomass fuels & hydrogen-based power systems. New specific high-temperature operating conditions are expected for each of these processes and the durability of candidate materials and coatings need to be assessed in order to meet targeted component lifetimes. This symposium will focus on both the scientific and technological aspects of material degradation in clean power generation technologies, including: new material and coating development, mechanical properties characterization, corrosion resistance in complex environments, and component lifetime prediction. The goal is to provide a forum for scientists and engineers from academia, national laboratories, and industry to present the latest developments and insight on the performance of materials being considered or used in clean power systems. Proposed session topics • Novel materials and materials degradation in clean coal and biomass power generation, hydrogen production from varied sources, and hydrogen-based IC and turbine systems. • Materials for high-temperature heat transport systems with novel heat transport media, including, but not limited to, liquid metal, salt, and supercritical CO2. • Degradation modeling and lifetime prediction of materials used in clean and renewable power systems.

2015 TMS Annual Meeting & Exhibition: Multiscale Microstructure, Mechanics and Prognosis of High Temperature Alloys: Organized by Mark Tschopp; Jeffrey Evans; Jonathan Cormier; Qiang Feng

A number of critical applications in industry demand the use of high temperature alloys that can withstand various extreme environments under elevated temperature conditions. Reliably predicting the life of these components, which may be subjected to damage associated with creep deformation, cyclic loading, environmental degradation, and combinations thereof, is a challenging endeavor. Under these conditions, the state of the microstructure after processing and its evolution during service lead to damage mechanisms that manifest over multiple length scales, ranging from quantum and atomistic scales to the mesoscale to the macroscale. This symposium will provide a venue for presenting recent achievements in understanding the microstructure evolution and mechanical behavior in high temperature alloys over multiple scales in order to ultimately predict the prognosis and life of components. Advances in experimental and computational capability have greatly improved our ability to understand and quantify deformation mechanisms in high temperature alloys. In particular, a goal of this symposium is to accelerate the development and acceptance of new methodologies for improving prognosis through understanding the fundamental relationships between material microstructure and mechanical behavior in these alloys. It is expected that this symposium will include talks ranging from atomistic, discrete dislocation, and continuum mechanics approaches for various length scales as well as experimental mechanics results that elucidate the behavior of these alloys. The subject areas of this symposium include, but are not limited to: • Multi-scale modeling of high temperature deformation and damage • Single crystal and polycrystal plasticity models • Deformation and damage based life prediction techniques • Modeling and experimental approaches to creep-fatigue-environment interactions • Discrete dislocation dynamics and mesoscale (phase field) modeling of creep deformation • Experimental methods for materials prognosis and structural health monitoring • Understanding and quantifying microstructure-property relationships at high temperature • Computational and experimental approaches for accelerated materials design of high temperature alloys • Effect of chemistry and processing on high temperature structure and properties