Learning outcomes of the course unit
Knowledge and ability to understand: through the frontal lessons learned during the course, the student will acquire the methods and knowledge about the plastic deformation mechanisms that determine the mechanical behavior of metallic materials at different working temperatures and on recent methods of manufacturing metal components such as additive manufacturing. Ability to apply knowledge and understanding:through practical classroom or laboratory exercises related to some topics in the program, students learn how to apply knowledge acquired in a real context of industrial issues.Judgment autonomyThe students must be able to understand and critically evaluate the link between microstructural and process parameters so that they can simulate deformation process even under unmanaged operating conditions. They also want to give directions on the choice of innovative production technologies for the production of metal components. Communication skillsThrough the frontal lessons and the comparison with the teacher, the student acquires the specific lexicon of mechanical metallurgy. It is expected that at the end of the course, the student will be able to transmit, in oral and written form, the content of the course and the problems of mechanical metallurgy.Learning abilityThe student who has attended the course will be able to deepen his / her knowledge in the field of mechanical metallurgy through the autonomous consultation of specialized texts, scientific or divulgative journals, even outside lecture topics, in order to effectively address entering into the labor market or undertaking further training paths
Course contents summary
The course proposes the study of plastic deformation mechanisms that affect the mechanical behavior of metallic materials at various temperatures. Part of the course will be devoted to understanding the structures obtained from innovative welding technologies, foundry, powder metallurgy and additive manufacturing and the relationship with their mechanical behavior.
Introduction to the structure of metals: crystallography, linear and planar density, mono and polycrystals, deformation of the crystalline lattices.Solidification of metals and alloys.Defects in solidified metals: point defects, dislocations, surface defects (grain boundaries, twins, stacking faults).Deformation in metals: definitions, stress-strain curves - deformation of metallic materials, strengthening methods in metals and alloys. Examples of aluminum alloys and steels.Deformation of metals at high temperatures: diffusion processes, phenomena of recovery and recrystallization. The hot deformation of metallic materials: high temperature stress-strain curves with examples of materials that undergo recovery or recrystallize. Constitutive equations. Case study: magnesium alloys.Creep of metals: testing, theoretical formulation, methods to increase creep resistance of a metallic material. Case study: Nickel superalloys.The superplasticity of metals: characteristics, microstructural requirements, equations. Superplastic forming for Diffusion Bonding. Thermomechanical methods for obtaining an ultrafine grain structure. Case studies of steels and light alloys for automotive and aeronautical applications.Powder metallurgy.Microstructure and properties of metallic components produced for Addivitive Manufacturing. Case study: Al-Si and Ti6Al4V alloys.
The slides projected during the course are made available to students in pdf format for sending directly to their email address. The following texts are recommended for the study of the topics discussed in the course: i) R. W. Hertzberg, Deformation and Fracture of Engineering Materials, Fourth ed, John Wiley & Sons, (1996); Ii) G.L. Dieter, Mechanical Metallurgy, 3rd edition (1986), McGraw-Hill Book Company, New York
The course is held in 6 CFUs, that correspond to 48 hours of lesson. The didactic activities will be carried out by privileging frontal classroom lessons in which the course topics will be tackled from a theoretical point of view, in order to help them understand the detailed themes in the program. Exercises / lab will be conducted on samples obtained by innovative technologies and hardness measures.
Assessment methods and criteria
Examination is done with a written test and an oral exam. The written test is composed of 3/4 questions that may relate to the theoretical contents and / or the exercises dealt with during the course. The test is exceeded if it reaches at least 18/30. Oral exam is an integral part of the exam and concerns the written exam or other parts of the exam. The final vote can be increased by 5-6 points. ’30 cum laude’ is given if the maximum score is achieved and mastery of the disciplinary vocabulary is demonstrated.