For over thirty-five years, Professor Brian Gleeson has been a leader in
corrosion science advancing understanding of the high temperature oxidation and
degradation of alloys and coatings. Brian has illuminated key thermodynamic and
kinetic aspects controlling the degradation of materials in harsh environments,
from gas/solid reactions to diffusion in the alloy and everything in between.
Brian's research career has included positions in Canada, Australia, and the
USA. Brian began his academic career at the University of New South Wales in
1990, moving to Iowa State University in 1998, before settling at the
University of Pittsburgh in 2007 where he builds upon a rich history of high
temperature corrosion research at the school. Throughout this time Brian’s
expertise, unassuming nature, and genuine interest in both research and
teaching has helped to shape countless students and young researchers
comprising the next generation of high temperature corrosion scientists and
engineers.
This symposium serves to recognize the exceptional quality of research and
mentorship that Brian has demonstrated throughout his career. As with Brian’s
own research, this symposium will cover
all aspects of the high temperature corrosion process. The aim of this special
symposium is to provide a forum for scientists and engineers to present and
discuss recent work on current understanding and characterization of corrosion
in high temperature aggressive environments. To align with Prof. Gleeson’s
areas of research, specific forms of degradation include but not limited to
mixed-gas attack (e.g., oxidation-sulfidation, oxidation-carburization,
oxidation-chloridation), hot corrosion, deposit-induced attack, and metal
dusting. These forms of attack may be in combination with some form of
mechanical loading (e.g., fatigue and creep) and/or thermal cycling.
High temperature materials are used in aerospace, power generation, and
chemical processing industries where components are expected to withstand
superior temperatures, high stresses, and reactive environments during service
intervals that last for decades. In order to design these components, methods
to accelerate service degradation are needed such that a mechanistic
understanding can be developed in a much shorter time frame, typically on the
order of months. In this symposium, abstracts are requested on topics including
but not limited to:
• Accelerated creep and fatigue testing methodologies, modeling frameworks, and
prediction capabilities
• Modeling and/or experimental methods to accelerate microstructure evolution
and/or mechanical property degradation at elevated temperatures and/or
aggressive environments
• Experimental methods to accelerate environmental interaction of high
temperature materials
• Interactions of creep, fatigue, environmental effects, and microstructure
evolution
High temperature alloys continue to play a vital role in the transportation and
energy industries. While both sectors look to improve the system efficiency by
raising the maximum temperature the alloys can withstand, the transportation
industry is also focused on lightweighting. In recent years we have seen
advances in a number of different alloy systems. This symposium aims at
providing a setting for researchers from academia, government, and industry to
discuss recent advances in the understanding of various mechanisms that
influence the strength, service life, and environmental resistance of high
temperature alloys.
Most industrial applications such as the aerospace, automobile, biomedical and
defense areas need materials that must operate in increasingly extreme and
complex environments. Usually no single existing alloy can meet all the
requirements of a desired system component. Thus, the successful design and
processing of a gradual change in composition and microstructure, and therefore
properties, over the whole material is gaining considerable attention in
materials science and engineering. Graded materials, coatings and claddings
allow for unique combinations of properties to enable various harsh
environment, functional and structural applications. In practice, functionally
graded materials (FGMs) are often susceptible to processing defects linked to
prohibitively time-consuming, empirical process development without the ability
to predictively determine and/or rapidly screen experimentally viable pathways
(composition and process parameters) to optimize their production. Due to these
limitations, the actual performance of FGMs, relative to conventional parts,
remains to be validated and optimized. This symposium focuses on all aspects of
the science and technology, from fundamental science to industrial
applications, that will enable control of the microstructure and properties of
graded materials coatings and claddings, including: thermodynamic, kinetic,
property, and microstructure evolution simulations; rapid processing; in situ
characterization; and understanding defect formation.
Many types of gradient systems are of interest, including from one alloy
composition to another, from metals to ceramics, and from intermetallics to
metals. Advances in coating technologies, new compositions of coatings, and
advanced manufacturing techniques are of interest. Specific topics include, but
are not limited to:
• Fundamental issues and underlying mechanisms in processing FGMs, coatings,
and claddings
• Development and demonstration of computational-experimental platforms to
produce viable graded components ready for various types of advanced testing
• Novel graded material combinations, coatings, and claddings for targeted
applications (i.e., optimized mechanical, functional and corrosion properties)
• Understanding of solidification, phase stability, and phase transformation
in FGMs
• Computational prediction of optimal material gradients and properties with
minimal processing defects, such as porosity
• Advanced processing methods for FGMs, coatings, and claddings: additive
manufacturing, physical vapor deposition, pack cementation, slurry c coating,
powder-based laser deposition, cold spray, thermal spray, and friction stir
processing
• Novel techniques and characterization methods for rapid FGM, coating, and
cladding optimization
High temperature alloys, including Ni-based, Ni-Fe-based and Co-based
superalloys, are critically important in enabling technological advancements
from the aerospace to the power generation, chemical processing and
manufacturing industries to atomic energy. Fundamental to the performance of
these materials are their deformation characteristics, both in terms of the
deformation necessary during manufacture as well as the deformation sustained
during service. Critical developments in the field of high temperature alloys
in recent years have been reliant on controlling and utilising deformation and
deformation induced phase transformations to achieve superior performance at
increasingly higher temperatures. Such advances have been further enabled by
the unparalleled innovation in the advanced characterisation methods and data
analysis tools used to investigate deformation characteristics in these
materials, such as dynamic TEM, atom probe tomography, high resolution EBSD,
advanced neutron and synchrotron X-ray diffraction and resonant ultrasound
spectroscopy, to name a few.
The aim of this symposium is to bring together the community to discuss the
effect of deformation on microstructural control and performance in high
temperature materials (Ni, Ni-Fe, Co superalloys, refractory metal alloys,
multi-principal element alloys) through the lens of advanced characterisation.
The proposed technical scope of the symposium includes (but is not limited to):
• Novel insights into deformation mechanisms obtained from advanced
characterisation and modelling validation methods; including elemental
segregation, phase-specific deformation characteristics and defect evolution.
• Deformation assisted microstructural control of high temperature alloys
during manufacturing processes (including powder metallurgy and additive
manufacturing methods).
• Deformation determined in-service performance of materials for high
temperature structural applications (including mechanical performance as well
as environmental resistance).
• Co-operative chemistry and processing design for improved alloy performance.
• Deformation effects on “finishing operations” including machining, heat
treatment and shot peening.
• Effect of deformation on phase and property evolution.
• High throughput methodologies for deformation assessment in manufacturing and
in service performance.
• Role of deformation in phase transformations and microstructural evolution.
• Non-destructive and correlative evaluation of deformation accumulation during
manufacturing and under in service conditions.
This symposium is by invitation only.
Through his creativity and scientific excellence, Easo George has made seminal
contributions to metallic materials research. During his long tenure at the
Oak Ridge National Laboratory and the Alloy Behavior and Design Group, most
recently as Governor’s Chair, he has led the nation’s most active alloy
development research activities. His expertise in phase transformations and
alloy processing has enabled innovations in intermetallics, refractory alloys,
and high entropy alloys. His group’s research has provided insights in the
wide-ranging topics of ductility and fracture behavior in intermetallics,
deformation behavior of refractory metals, and compositional effects in high
entropy alloys. In addition, his innovative work on the solidification of
eutectic single crystal microstructures provided a unique pathway for creating
small material volumes for exploring size effects in mechanical behavior. In
addition to the impact of his group’s own research, he also generously enabled
the research efforts of many collaborators by providing alloys with highly
controlled chemistries and microstructures.
This symposium will provide a forum for presentation of topical advances in:
• Principles of alloy behavior and design
• Strategies for defeating the strength-ductility “trade-off”
• Compositionally complex (high entropy) alloys
• Small-scale mechanical behavior
• Links between deformation mechanisms and mechanical behavior
• Advanced metallic alloys and intermetallics for high temperature structural
applications
Given the simultaneous development of high temperature alloys and manufacturing
processes, it is necessary to investigate the effects on creep properties of
these coexisting advancements. With the resurgence of high temperature
refractory alloys and oxide dispersion alloys through the relatively new
material class of multi-principal element alloys and the advent of other such
superalloys, it is critical to re-examine conventional behaviors of creep as
these new alloys introduce additional mechanisms that have not been
traditionally observed. Beyond compositional advances, there have been
exceptional fabrication and processing advances in the last decade such as
those in additive manufacturing that directly impact the creep properties of
these materials. This symposium focuses on the new challenges and new
opportunities in advanced structural materials for service under extreme
conditions and poses a reconsideration of what is thought to be typical high
temperature creep behavior given this ever changing materials landscape.
Supersonic and hypersonic regimes require materials resistant to high
temperature and high-rate deformation to survive extreme aerodynamics and
aerothermal conditions. Furthermore, candidate materials must retain high
strength and sustain oxidation, creep, fatigue, and widely varying cyclic
thermal gradients. Although limited in the application space, several candidate
materials such as composites, ceramics, and refractory multi-principal-elements
alloys (MPEAs) hold the potential to satisfy these needs. Improving existing or
developing new materials requires integrating both simulations and experiments
to cover all length scales, temperatures, and strain-rates. Simulation can fill
gaps where experiments are not possible or supports experimental results
analysis when in-situ observations are unpractical. This symposium intends to
foster presentations and discussions around new approaches to design next
generation materials beyond supersonic applications. We invite abstracts
submission on the following topics for high temperatures and high strain rates
applications:
- Simulations for accelerated alloy design (CALPHAD, crystal plasticity,
phase-field, atomistic…)
- Microstructures and mechanical properties (uni- or multi-axial loading,
damage, fatigue…)
- Degradation (corrosion, oxidation, wear…)
- Advanced in-situ characterization techniques (electron microscopy, high
energy X-ray diffraction and tomography…)
- 3D characterization (electron back scattered diffraction, high energy X-ray
diffraction and microscopy…)
- Advanced processing for metastable materials and near-net shape components
- Coatings and internal cooling systems
High temperature alloys, notably 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, application and refurbishment of high temperature alloys,
principally Ni, Co and Fe based superalloys but also high entropy or
multi-principal element alloys and refractory alloys. It is proposed that the
technical focus is in understanding:(i)Roles of deformation and heat treatment
on the evolution of microstructure during material processing, (ii)Effects of
deformation from manufacture on material and component behaviour,
(iii)Mechanisms of deformation that determine material behaviour,
(iv)Development of deformation that gives rise to damage during material
application, (v)Effects of composition and microstructure on resistance to
deformation and damage accumulation, (vi)Refurbishment, rejuvenation and life
extension processes. Topics of interest may include (but are not limited
to):(a)Elevated temperature forging, recrystallization, grain growth, flow
forming, machining and shot peening, (b)Advanced solidification techniques and
impact on properties, (c)Experimental observation of deformation and damage
accumulation, (d)Constitutive and computational modeling of deformation,
(e)Mechanisms of ambient and elevated temperature plasticity, creep, fatigue
(LCF, HCF, VHCF), creep-fatigue, crack growth and environmental damage.
The growing field of Additive Manufacturing (AM) provides new exciting
challenges and opportunities in physical metallurgy. Inherently different to
traditional manufacturing processes, in AM, metallic systems undergo various
localised phase transformations in fractions of a second during a build. For
instance, the layer-by-layer approach gives rise to the so-called intrinsic
heat treatment, where earlier layers continuously experience a temperature
gradient induced by the melting of subsequent layers. This often results in an
inhomogeneous microstructure throughout the build, and in some cases,
precipitation can be triggered from early stages. Therefore, there is a need
for AM-tailored post-processing conditions.
For a wider adoption of the technology in industry, the knowledge on the
microstructure needs to be extended to its stability in service, including high
load and temperature conditions. Such understanding will provide a solid
background in the design of microstructures tailored for the AM process, and
bring us a step closer in establishing the materials paradigm for AM.
Topic of interest include, but are not limited to:
* Microstructural characterisation of AM-processed materials throughout
post-processing.
* Physical modelling / simulation of phase transformations and microstructural
evolution.
* Phase transformations and microstructural stability of AM components under
extreme conditions.
* Effects of powder manufacturing process and recycling on phase stability.
* Processing effects on as-built microstructure gradients and texture.
Superalloys are critical to operation and future design of a wide variety of
propulsion and power generation components in the aerospace, marine, and energy
industries. Their industrial application is often driven by excellent long-term
stability and durability at elevated temperatures or in aggressive environments
because they display a good balance of mechanical strength, fatigue and creep
resistance, as well as corrosion and oxidation resistance. The symposium aims
to attract papers on current and state-of-art application of Ni- and Co-based
superalloys. Topics of interest may include (but are not limited to):
• Viability of fabrication with additive manufacturing methods (powder bed
techniques and direct energy deposition)
• Relationships of metallurgical processing with microstructure and
performance (i.e. casting, forging and heat treatment)
• Mechanisms of ambient and elevated temperature plasticity, creep, fatigue,
creep-fatigue, crack growth and environmental damage
• Mitigation of environmental, thermal, and thermal mechanical damage,
including improved coatings for service operation
• Advancement in joining, repair, and rejuvenation of superalloys
This symposium is a continuation of four previous successful symposia held at
TMS annual meetings in 2001 (Indianapolis), 2006 (San Antonio), 2012 (Orlando)
and 2016 (Nashville). It serves as a periodic review of the state-of-the-art
development on the subject. In this symposium, we will bring together materials
scientists and engineers to share their experiences, including successful and
unsuccessful examples, challenges, lessons learned, in developing wide variety
of class of alloys for industrial applications, as well as new tools and
methodologies that enable efficient alloy design and accelerated implementation
processes. The interaction between the two groups will bridge the gaps between
them, thus accelerating the transition of new design tools to alloy
development. Covering both past experiences and new approaches – both
experimental and computational, this symposium will also help identify some
critical areas/needs in new methodologies/tools for the community to focus
upon. Applications of artificial intelligence and machine learning to alloy
design are one of the new areas of interest in this symposium.