The primary aim of this course is to give students basic knowledge of materials, microstructure and processing technologies of interest for automotive and mechanical engineering. The properties of the main classes of materials will be presented, in particular their mechanical and thermal properties. Special attention will be given to steels, cast irons and Al alloys along with their manufacturing processes. Applications of selected classes of steels, Al alloys, cast irons will be discussed, together with the main classes of polymers, aiming to guide students toward material selection, design and quality assessment.

The main aim is to provide the student with a robust background in materials, able to couple scientific and technological knowledge in a synergistic manner, providing general guidelines for translating scientific knowledge into technological tools for mechanical and automotive engineering. The student will learn: - the relation between materials atomic structure and properties; - how to exploit this scientific background in controlling materials properties; - how to select materials to fulfil design requirements; - to develop a confident approach to materials and their properties; - how the main mechanical tests are executed practically; - how to correlate the mechanical and technological properties of alloys with manufacturing technologies, - how to optimally select metals and alloys, including manufacturing processes for the design and construction of mechanical components and structures under specified operating conditions.

The student is required to have a robust, basic knowledge of Chemistry and Physics.

The course is developed along Lessons, Exercise and Lab Training. Science and Technology of Materials (STM): Introduction on metals, polymers, basic notions on ceramics, glasses and composites. Correlations structure/property of materials, Crystalline structure and defects, Amorphous structure, Plastic deformation. (10 hours). Mechanical and thermal properties, their relation to materials structure (20 hours). Phase diagrams use and examples (10 hours). Polymers, glasses: properties, uses and related technologies (10 hours). Technology of Metallic Materials (TMM). Brief review of metallic bonding theory: electronegativity, anisotropy and allotropy, Humé-Rothery rules; solid solutions, intermetallic and interstitial compounds. Extended treatment of lattice defects in metals. Multiscale of microstructure; inspection and diagnostics by microscopy. Strengthening mechanisms. Corrosion of metals and alloys and their protection methods. Tensile test; the Ludwik-Hollomon law; extraction of formability parameters from tensile test curve. (20h). Manufacturing of alloys. Manufacturing by casting technologies, Homogeneous/ heterogeneous nucleation and phase growth upon solidification; casting microstructure and defects, semi-solid casting; solid-state phase transformations. Manufacturing by plastic deformation (hot, warm and cold forming); stress relieve, recrystallization, grain growth; superplastic forming; forging, rolling, extrusion. Cold sheet forming: deep drawing, hydroforming; influence of processing methods on microstructure and mechanical properties. Sheet formability tests; FLD curves. Manufacturing by powder metallurgy. Overview of welding, alloys weldability, welding defects. (10h) Ferrous alloys: European nomenclature; basic phase diagrams: metastable Fe-Fe3C, Fe-N, Fe-Ni, Fe-Cr; production of steels; influence of alloying elements; equilibrium and non equilibrium phases in steels; their microstructure and distinctive properties. TTT curves and CCT curves: origin, interpretation and their application to heat treatment of steels. Annealing, normalizing, quenching and tempering. Hardenability and Jominy test; thermomechanical heat treatments: austempering and martempering. Embrittlement and residual stresses upon cooling. Surface hardening of steels: induction and laser hardening, carburizing, nitriding and carbonitriding treatments. Stainless steels. Example of selection of steels for mechanical applications. Cast irons: European nomenclature of cast irons; equilibrium Fe-C phase diagram, microstructure and mechanical properties of grey, ductile, white cast irons; heat treatment method and mechanical properties. (15h) Non ferrous metals: alluminum and alluminum alloys; European nomenclature, classification. Casting alloys: influence of alloying elements; Al-Si phase diagrams. Methods of microstructure refinement. Wrought alloys. Strengthening by heat treratment: aging, underaging and overaging. Mechanical properties. Selection criteria of alloys for mechanical applications. Overview of magnesium and magnesium alloys; titanium and titanium alloys; copper and its alloys.

https://didattica.polito.it/img/sustainable_goals/11.jpg

STM: numerical exercises and/or open questions on phase diagrams, on mechanical and thermal properties of materials. TMM. In laboratory: tensile, hardness and impact tests. Metallography: preparation of samples and observation with optical microscope. Exercise classes: the topics of practical relevance will be explored as case studies through exercise. 30 min videos on steel production and on the relationship between microstructure and mechanical properties will be shown for better insight. The Program CES-EDUPACK will be introduced and exploited to solve a few mechanical applications.

The teaching material will be available in the form of slides (STM) lecture notes In addition, the following textbooks are suggested as guideline as well as for in-depth study. STM: W. D. Callister "Materials Science and Engineering An Introduction" – John Wiley & Sons, Inc. TMM: • Structure and Properties of Engineering Alloys, W.F. Smith, McGrawHill, 2^ Ed., 2004. • R.A. Higgins - Materials for engineers and technicians: applied physical metallurgy, 6th ed., Arnold, 2006. • M. Ashby – Materials Engineering Science Processing and Design, BH, 1st Ed., 2007. • Meyers-Chawla - Mechanical Behavior of Materials, 2nd ed., Cambridge, 2009. • Z. Marchiniak, J.L. Duncan, S.J. Hu, Mechanics of Sheet Metal Forming, BH, 2nd Ed., 2002. • M.F. Ashby, D.R.H. Jones, Engineering Materials 1: An introduction to properties, applications. and design, B/H ed., 2012.

Slides; Esercizi risolti; Strumenti di auto-valutazione;

Modalità di esame: Prova scritta (in aula); Prova orale obbligatoria;

Exam: Written test; Compulsory oral exam;

... Students who pass either TMM or STM exam, iare s able to hold their score, until the other exam is passed, for a maximum time limit of one academic year. Only when both exams passed, the final mark, which results from the algebraic average of both exam marks, will be formally recorded on the student’s electronic "libretto". 18/30 is the minimum to pass each exam. 30/30 cum laude (L) is the maximum. Cum laude (L) is awarded to exceptionally good exams, exceeding the maximum, as a discretional decision of the evaluator. The STM the exam consists in a written test based on four questions and/or exercises similar to those made during STM lectures and covering all the STM program; it will last one hour, the end time will be written on the blackboard; use of internet, books and notes is not allowed, as well as any communication with other students, which will result with the end of the exam. It is possible to leave the room during the exam, but this means the exam cannot be continued. Exceptions due to proven health issues are allowed. Students are allowed to use their calculator. An identity card with picture must be kept on the desk during the exam, together with pens, ruler and calculator. The students are requested to write in an understandable way, not with pencils; no additional pages must be added to the provided ones. Bags and backpacks must be left at the room exit. Students willing to withdraw must write "withdrawn" on the first page, give the exam text back to the teacher, then exit the room. Results will be communicated on the course web page by the end of the exams’ session; students can see their revised exam: date and place will be communicated on the course web page. The TMM exam consists of two steps: a 30 min written test (consisting of three "semi-open" questions) - the use of internet, books, notes, electronic devices, including calculators, is not allowed - and 10 to 15 min oral test, consisting of two questions. The first step aims at assessing the acquired fundamentals of TMM. The oral test will start with an initial question, which may relate with the written test whereas the second question may require the solution of a case study, especially on applications of materials selection. "Semi-open" means that the questions will imply answers within a fixed number of lines and following specific guidelines.

Gli studenti e le studentesse con disabilità o con Disturbi Specifici di Apprendimento (DSA), oltre alla segnalazione tramite procedura informatizzata, sono invitati a comunicare anche direttamente al/la docente titolare dell'insegnamento, con un preavviso non inferiore ad una settimana dall'avvio della sessione d'esame, gli strumenti compensativi concordati con l'Unità Special Needs, al fine di permettere al/la docente la declinazione più idonea in riferimento alla specifica tipologia di esame.