METALLURGY II
Academic year and teacher
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- Versione italiana
- Academic year
- 2022/2023
- Teacher
- MATTIA MERLIN
- Credits
- 6
- Didactic period
- Secondo Semestre
- SSD
- ING-IND/21
Training objectives
- The integrated course of “Metallic materials and processing techniques” consists of the two teachings of Metallurgy II and Manufacturing Technology II.
Metallurgy II provides the student with the necessary sensitivity to understand the correlation between microstructure and properties for the most important ferrous and non-ferrous metal alloys for structural applications (also for high temperatures).
The knowledge of the microstructural characteristics, the heat treatments and mechanisms that contribute to the mechanical properties of metallic materials is important in mechanical design, but also during manufacturing and processing of these materials. The technological aspects will be covered in the teaching of Manufacturing Technology II.
The student will be able to evaluate the metallurgical characteristics useful to properly machine the material as well as to establish the final heat treatment conditions for the component, according to the specific application and the in-service environment. Moreover, the student will acquire the skills to understand the microstructural features of fracture surfaces of metallic materials according to different failure mechanisms. Prerequisites
- The student must have the base knowledge of metal science and of the metallographic structures of carbon steels.
Course programme
- • 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. Applicability of surface treatments and thermochemical treatments to steel components. HSLA steels, high strength steels (HSS), advanced high strength steels (AHSS): DP, TRIP, Q&P and TWIP steels. Main metallurgical features for improving technological workability (formability, machinability and weldability). (15 hours)
• Stainless steels. General properties and effect of alloying elements, Schaeffler diagram. Sensitization of stainless steels. Austenitic, ferritic, martensitic, duplex and precipitation hardening (PH) stainless steels. Potentials and limits of the different steel grades, heat treatments and applications. Workability and weldability. (10 hours)
• Tool steels. UNI and AISI designations of tool steels. Cold working, hot working and high-speed tool steels. Effects of alloying elements. Application requirements and properties. Production processes and heat treatments. (5 hours)
• Cast irons. Solidification processes and Fe-C-Si diagram. The carbon equivalent of cast irons. Influence of alloying elements on microstructure and mechanical properties. White cast irons, grey cast irons, malleable cast irons, ductile cast irons: UNI EN standards, microstructure, heat treatments and properties. (5 hours)
• Light alloys. Aluminium alloys, magnesium alloys and titanium alloys. UNI EN standards and classification. Effect of alloying elements, microstructural transformations, properties and heat treatments. Metallurgical features for the technological workability of these alloys in brief. (12,5 hours)
• Creep and high-temperature alloys. (5 hours)
• Failure mechanisms of metallic materials: ductile fracture and brittle fracture. Static failure and fatigue failure. (5 hours) Didactic methods
- Frontal lectures on all the course’s topics.
Learning assessment procedures
- The examination consists of three oral questions on all the topics of the teaching, in order to assess their understanding. In particular, the ability to talk about, discuss and critically link the proposed topics will be evaluated. For the different metallic materials, the student must prove the knowledge of the most important metallurgical features for proper workability, choice and in-service application. The mark is formulated according to the level of achievement of the training objectives.
Reference texts
- • Teacher’s handouts.
• 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.
• G. Krauss, Steels: processing, structure and performance, ASM International.
• M. Y. Demeri, Advanced high-strength steels: science, technology and applications, ASM International.
• M. Cabibbo, Leghe e metalli non ferrosi, Società Editrice Esculapio.
• I. Polmear et al., Light Alloys – Metallurgy of the light metals, Butterworth-Heinemann.
