METALLURGY II
Academic year and teacher
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- Versione italiana
- Academic year
- 2014/2015
- Teacher
- MATTIA MERLIN
- Credits
- 6
- Curriculum
- INDUSTRIALE
- Didactic period
- Secondo Semestre
- SSD
- ING-IND/21
Training objectives
- Aim of the course is to give knowledge regarding the choice and application of both traditional and advanced engineering metallic materials. For a proper design of mechanical components and better in-service applications of metallic materials, students must have a deep knowledge of some of the most popular metallic alloys and of the factors influencing their microstructure and therefore their mechanical properties.
Prerequisites
- The student must have the basic knowledge on metal science and of the metallographic structures of carbon steels.
Course programme
- Materials in mechanical engineering: an introduction. Materials selection charts.
Norms and classification of steels. Carbon and alloyed steels. Quality and special steels. Alphanumeric and numeric designation of steels.
Iron properties and influence of alloying elements: nickel, manganese, cobalt, nitrogen, aluminium, molybdenum, silicon, titanium, niobium, vanadium and boron. Impurities and non metallic inclusions. Influence of sulphur, phosphorus, hydrogen, oxygen.
Surface heat treatments. Techniques for surface hardening, induction hardening, flame hardening and laser hardening.
Thermochemical treatments. Carburizing (solid, liquid and gaseous carburizing). Heat treatments after carburizing. Nitriding (gaseous and liquid nitriding). Comparison between carburizing and nitriding.
Thermomechanical treatments at high and low temperature. Controlled rolling. Ausforming, Isoforming, TRIP, Perlitoforming, Marforming.
Construction steels for general use. Effervescent and calm steels. Weldability of steels. Quality steels: dual phase steels, weathering steels, microalloyed and high strength low alloy steels (HSLA).
Special steels: quenched and tempered steels, bake hardening steels, carburizing steels, nitriding steels, spring steels. Special steels for rolling bearings.
Tool steels. Reinforcing mechanisms, effects of alloying elements on mechanical properties, production process and thermal treatments. UNI and AISI designation of tool steels. Cold working, hot working and high speed tool steels.
Maraging steels and High Manganese steel (Hadfield steel).
Stainless steels. Effect of alloying elements and structural diagrams (Schaeffler diagram). Austenitic stainless steels: sensitization, cold hardening and martensitic transformation (Md). Ferritic stainless steels: sensitization, 475°C embrittlement, precipitation of s phase, extra low interstitial (ELI) stainless steels. Precipitation hardening (PH) steels: martensitic, semi-austenitic and austenitic PH steels. Duplex steels: secondary phase precipitation phenomena, Pitting Resistance Equivalent Number (PREN), heat treatments and superplasticity.
Cast irons. Production of cast irons in brief. Solidification processes: influence of alloying elements on microstructure and mechanical properties. Fe-C-Si diagram. Classification and designation of cast irons: white cast iron, grey cast iron, malleable cast iron, ductile cast iron and austempered ductile iron (ADI). Methods of spheroidisation and inoculation of cast iron. Heat treatments, mechanical properties and selection of cast iron.
High temperature alloys. Superalloys. Creep phenomena in metallic materials.
Shape memory alloys (SMAs). Metallurgical aspects of shape memory effect. Description of OWSME, TWSME and superelasticity. Most important shape memory alloys: Cu-based alloys and NiTi alloys. Introduction to deformable active structures. Applications. Didactic methods
- Lectures
Learning assessment procedures
- The examination is oral 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 covered during the course, 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. Reference texts
- - A. Cigada, G. Re, Metallurgia Vol.2 - Materiali metallici di interesse industriale, Ed. Clup Milano
- A. Cigada, T. Pastore, Struttura e proprietà dei materiali metallici, McGraw-Hill
- G.M. Paolucci, Lezioni di Metallurgia Vol.1 e 2, Ed. Libreria Progetto Padova
- Lesson’s notes and teacher’s lecture notes
