Esteban P. Busso is currently the Scientific Director of ONERA’s Materials and Structures Branch (approx. 250 permanent staff and 35 PhD students). ONERA is the largest public research establishment in France specialised in aerospace, aeronautics and defense with 1800 permanent staff. From 2005 till 2013 he was a Professor of Mechanics of Materials at the,en Ecole des Mines de Paris and Director of the Ecole’s Mat & eacute Centre; mate- and, from 1994 till 2005, Professor at Imperial College’s Department of Mechanical Engineering in London, UK. Dr. Busso obtained his undergraduate degree from the University of Cordoba, Argentina, in Dec. 1980. In 1985, he joined the Massachusetts Institute of Technology (MIT) in Cambridge, USA, where he was awarded his MSc degree and, in 1990, his PhD degree in Mechanical Engineering. He has also worked in industry in the UK, Japan, South Africa and Argentina. His research involves micromechanics studies of deformation and fracture of materials and interfaces, with an emphasis on the development of multiscale and multiphysics concepts in mechanistic models to predict deformation and fracture processes.,en
In August 2014, Dr. Busso was elected to the British Royal Academy of Engineering. He is a Fellow of the British Institute of Materials, Minerals and Mining and of the Societé Francaise des Matériaux, a Chartered Engineer in the UK and a member of the Royal Academy’s Aerospace Committee. He is currently the associate editor of Philosophical Magazine and until recently of the ASME Journal of Engineering Materials and Technology, and an Editorial Board member and guest editor of the Int. Journal of Plasticity, the Journal of Multiscale Modelling, the Journal of Mechanical Behavior of Materials, the journal of Materials at High Temperatures and the Journal of Materials Discovery. He has authored and edited 12 scientific books, and published over 135 articles in peer reviewed international journals (H-index of 29). He has also organised or co-organised 13 international conferences and more than 16 international symposia in the field of mechanics of materials. He has also taught materials and mechanics courses at the undergraduate and the graduate level for over 25 years. He is an advisor to industry worldwide, to the US Department of Energy, the European Commission, as well as the British, Dutch and French research councils, amongst others.
Appointments
From 11/13 ONERA – NATIONAL AEROSPACE RESEARCH CENTRE, Paris, FRANCE
10/05-10/13 SCHOOL OF MINES PARIS, Materials Centre, Paris, FRANCE
9/94-9/05 IMPERIAL COLLEGE, Dept. of Mechanical Eng., London, ENGLAND
2/92 – 8/94: WS ATKINS SCIENCE AND TECHNOLOGY, Epsom, ENGLAND
9/90 -11/91: HITACHI LTD., Mechanical Eng. Res. Lab., Tsukuba, JAPAN
8/85 – 7/90: MASSACHUSETTS INSTITUTE OF TECHNOLOGY, Dept. of Mechanical Eng. Cambridge, USA
3/85 – 7/85: ATLAS AIRCRAFT CORPORATION, Johannesburg, SOUTH AFRICA
7/83 – 2/85: ELECTRICITY SUPPLY COMMISSION, Test & Res. Dept., Johannesburg, SOUTH AFRICA
8/78 – 6/81: NATIONAL UNIVERSITY OF CORDOBA, Research Centre of Materials, Cordoba, ARGENTINA
Abstract of plenary conference:
On the Incorporation of Environmental effects in Multi-scale Modelling Approaches
This work deals with the study of environmental effects on the behaviour of Ni-based superalloys used in jet engines and on austenitic steels used in power plants. Such effects need to be considered as the mechanical behaviour of high temperature structural materials depends upon the variability of the microstructure, which is strongly conditioned by the severity of creep/oxidation interactions. Attention is particularly focused on the interaction between oxidation, time-dependent behaviour and microstructure and the local conditions responsible for the formation of surface and grain boundary micro-cracks. Methodologies based upon fundamental physical processes are presented for understanding and predicting oxide growth and the nucleation of associated damage.
First, the surface oxidation of Ni-base superalloys is described using a coupled diffusion-single crystal plasticity approach. When superalloys operate at high temperatures, the microstructure is not stable: the γ' precipitates coarsen rapidly and, in the vicinity of free surfaces, there is a depletion of the ’ precipitates due to surface oxidation. Both mechanisms lead to a local softening of the material which in turns reduces the local stresses. Here, the local material behaviour is made to depend explicitly on the characteristics of the ’-reinforcing phase which are, in turn, affected by the local concentrations of Ni, Al, and O2. The degradation of the local notch root region fields caused by the surface oxidation of a Ni-base superalloy notched compact tension (CT) specimen is discussed. Finite element analysis of the CT specimen revealed how environmental effects can severely reduce the time to crack initiation due to the oxidation-induced material softening.
The second part of this work deals with the growth of oxides along easy diffusion paths such as certain grain boundaries and localised deformation/slip bands intersecting free surfaces. Here, simultaneous surface and grain boundary oxidation phenomena in polycrystalline Fe-Cr-Ni austenitic steels are described through a coupled diffusion-crystal plasticity-phase field formulation. Oxidation is considered at the grain level where the effects of plasticity and grain boundaries on oxide growth are accounted for. Full field finite element simulations of a plastically deformed and oxidising bi-crystal are performed to describe the preferential oxide growth. The resulting preferential oxidation of the grain boundary is shown to depend on the wetting properties of the oxide interface with the grain boundary, the grain boundary energy and the relative grain boundary and bulk diffusivities.
Fernando Augusto Actis, is a Doctor in Engineering Sciences, National University of Córdoba, Faculty of Exact, Physical and Natural Sciences. Materials Orientation. Chemical Engineer, National Technological University, Córdoba Regional Faculty. Quality Director of the South Area Manager, Ternium Siderar, Techint Organization (Argentina), with operational responsibility in Argentina and its neighboring countries. Member of the Scientific Committee of the Roberto Rocca Education Program, for the allocation of doctoral scholarships for outstanding students from Argentina, Brazil, Colombia, Malaysia, Mexico, Romania and Venezuela, at top international universities. 2009 to date. Member of the Board of Directors. IPACE – Argentine Professional Institute for Quality and Excellence. Member of the Academic Council of the Postgraduate Degree in Steel - Argentine Institute of Steel. Member of the Board of Directors of the Materials Center and the advisory committee of the Mechanical Engineering degree. ITBA – Buenos Aires Technological Institute. Previously, he worked as an Engineering and Product Development Manager with operational responsibility at Ternium México, Ternium Internacional (United States), Ternium Colombia, Ternium Centro América and Ternium Siderar. Ternium Sidor Product Coordinator, Techint Organization (Venezuela). Product Development Department, Coordinator of Siderar Coated Steels, Techint Organization (Argentina). Technological advisor Renacity Investment (Argentina). Product Development Department, Principal Metallurgist Siderar, Techint Organization (Argentina). Professor of the Master's Degree in Steel Industry at the University of Buenos Aires, Faculty of Engineering. Professor of the Postgraduate Course in Steel at the National Technological University, San Nicolás Regional Faculty. Guest professor for his Postgraduate Degree in Materials Autonomous University of Barcelona. Professor of Physical Chemistry and Metallurgical Physical Chemistry at the National Technological University, Córdoba Regional Faculty. Professor of the Master's Degree in Technological Materials Sciences at the National University of Comahue, Faculty of Engineering. Head of the Materials Division of the Materials and Metrology Research Center of the National Institute of Industrial Technology (I.N.T.I.). Category “B” researcher, Incentive regime for teacher-researchers of the National Technological University, Córdoba Regional Faculty. Main areas of work: Processing of Uranium Oxide for fuel elements, Processing of Mg-Zn, Ni-Zn and Mn-Zn Ferrites for various applications, Nd-Fe-B Magnets, Electrical steels, Design of magnetic applications by elements finite: electric motors, magnetic metrology, dewaxing of paraffinic oils.
Summary of the plenary conference:
Trends in steel processes and products for the automotive industry. Advanced High Strength Steels (AHSS) hot rolled and galvanized
Steel is a dynamic material that constantly evolves to respond to the growing requirements of the automotive industry. Very high resistance steels constitute the steel industry's contribution to the demands of reduced fuel consumption and emissions, greater safety and comfort. The needs to manufacture vehicles with lower weight, combined with greater crash resistance, are the main drivers of the search for new metallurgical concepts aimed at finding a compromise between maximum resistance, ductility and weldability, through the combination of several possible structures, such as polygonal and non-polygonal ferrite, retained or stabilized austenite, bainite and martensite. Advanced high-strength steels (AHSS), and hardenable steels for automotive applications, have a growing insertion in new automobile platforms and have naturally also generated a notable impact on the configuration of industrial facilities intended for their processing. This work provides an overview of the latest developments in the field of hot-rolled and dip-galvanized AHSS and presents the industrial trends that are beginning to consolidate.
