METALLURGY II
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- Versione italiana
- Academic year
- 2013/2014
- 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 applications 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 the influencing factors on microstructure and therefore on the mechanical properties of metallic alloys.
Prerequisites
- The student must have the base knowledge of the 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. Base, 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. Influence of impurities and non metallic inclusions: 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. Carbonitriding. Boriding treatment in brief.
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 σ 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 and applications. Didactic methods
- Lectures
Learning assessment procedures
- Oral examination
Reference texts
- - A. Cigada, G. Re. Metallurgia Vol.2 - Materiali metallici di interesse industriale. Ed. Clup Milano.
- W. Nicodemi. Acciai e leghe non ferrose. Ed. Zanichelli Bologna.
- G.M. Paolucci, Lezioni di Metallurgia Vol.2, Ed. Libreria Progetto Padova.
- Lecture notes
