METALLURGY II
Academic year and teacher
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- Versione italiana
- Academic year
- 2017/2018
- Teacher
- MATTIA MERLIN
- Credits
- 6
- Didactic period
- Secondo Semestre
- SSD
- ING-IND/21
Training objectives
- For the proper design of mechanical components and the most suitable in-service applications of metallic materials, students must have a deep knowledge about some of the most popular metal alloys and the key factors influencing their microstructure and, therefore, their mechanical properties. The aim of the course is to give knowledge regarding the characteristics and the properties of some of the most important metal alloys, particularly widespread in the engineering field. The student will acquire the necessary sensitivity to understand the correlation between process, microstructure and properties. On the basis of the acquired knowledge, the student will be able to deal with the choice of the most suitable metal alloys for the realization of mechanical components, according to the specific application and the operating conditions.
Prerequisites
- The student must have the base knowledge of the metal science and of the metallographic structures of carbon steels.
Course programme
- - Steelmaking in brief (blast furnace, electric furnace, continuous casting and ingot casting). (2,5 hours)
- Designation and classification of steels (UNI EN 10020, UNI EN 10025, UNI EN 10027). Alphanumeric and numeric designation and quality grades of steels. (2,5 hours)
- Structural steels, nitriding and carburizing steels, quenching and tempering steels, spring steels and bearing steels. HSLA steels, high strength steels (HSS), advanced high strength steels (AHSS), TRIP and Q&P steels, TWIP steels. (7,5 hours)
- Stainless steels. General properties and effect of alloying elements. Schaeffler diagram. Sensitization of stainless steels. Austenitic, ferritic, martensitic, duplex and precipitation hardening stainless steels. Potentials and limits of the different steel grades, heat treatments and applications. (7,5 hours)
- Tool steels. Application needs and properties. Effects of alloying elements. Production process and thermal treatments. UNI and AISI designations of tool steels. Cold working, hot working and high speed tool steels. (5 hours)
- Cast irons. Solidification processes of cast irons. Fe-C-Si diagram: carbon equivalent. Influence of alloying elements on microstructure and mechanical properties. White cast iron, grey cast iron, malleable cast iron, ductile cast iron and austempered ductile iron (ADI). Heat treatments. (5 hours)
- Aluminium and aluminium alloys. Aluminium production: Bayer and Hall-Herault processes. Properties of pure aluminium and of aluminium alloys: effect of alloying elements. Classification and designation of aluminium alloys: foundry aluminium alloys and wrought aluminium alloys. Heat treatments. Traditional and innovative foundry processes of aluminium alloys. (15 hours)
- Magnesium and magnesium alloys: properties and heat treatments (2,5 hours)
- Titanium and titanium alloys: a, a+ß, and ß alloys. Properties, heat treatments and microstructural transformations (2,5 hours)
- NiTi shape memory alloys. Shape memory effect (SME) and superelastic effect (SE): microstructural and mechanical aspects. Functional structures. (5 hours)
- Welding metallurgy. Metallurgical and microstructural phenomena in weld joints. Welding defects: hot cracks and cold cracks. (5 hours) Didactic methods
- Frontal lectures on all the course's topics.
Learning assessment procedures
- The examination consists of oral questions on all the topics covered during the course and is performed in order to assess the understanding of the theoretical subjects tackled in the class. In particular, the ability of critically linking the different subjects, rather than the capacity to simply repeat the specific topics, is evaluated. The student must show a sufficient knowledge of the principal characteristics of the different classes of metallic materials for their correct choice and application. The mark is formulated verifying at which level the learning objectives previously described have been acquired.
Reference texts
- - Teacher's handouts available on the course web page.
- A. Cigada, T. Pastore, Struttura e proprietà dei materiali metallici, McGraw-Hill.
Specific topics can be further learnt in the following texts:
- G.M. Paolucci, Lezioni di Metallurgia Vol.1 e 2, Ed. Libreria Progetto Padova.
- G. Di Caprio, Gli acciai inossidabili, Hoepli Editore.
- C. Cibaldi, "I criteri di scelta e di trattamento degli acciai da costruzione e da utensili", Collana tecnica AQM.
- Istituto Italiano della Saldatura, Saldatura per fusione, Vol. 1 e Vol. 2, Hoepli Editore.
- G. Krauss, Steels: processing, structure and performance, ASM International.
- M. Y. Demeri, Advanced high-strength steels: science, technology and applications, ASM International.
