METALLURGY I
Academic year and teacher
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- Versione italiana
- Academic year
- 2022/2023
- Teacher
- GIAN LUCA GARAGNANI
- Credits
- 6
- Didactic period
- Primo Semestre
- SSD
- ING-IND/21
Training objectives
- The mechanical engineer, involved in design, plant maintenance, management and quality control, is strongly connected to the materials world. This course aims at giving the basic knowledges on metals science, on transformation from liquid to solid state, on reinforcement mechanisms, on thermal treatments and on the effect of cold and hot plastic deformations. With this metallurgical knowledge the student will be able to interpretate relationships between microstructure and mechanical properties of metallic alloys, to carry on metallographic analyses, to evaluate the influence of processing and technological treatments, of defects, for choosing and applying metallic materials in the engineering field, in order to guarantee the best exercise behaviour.
Prerequisites
- Students must have studied the first year course “Fundamental of Chemistry and Materials” and must have the base knowledge of physic, inorganic chemistry and material science.
Course programme
- The metallic state. Metal alloys: substitutional and interstitial solid solutions.
Defects of the crystalline structures. Dislocationd and plastic deformation.
Metals solidification. Nucleation and growing theory of crystals.
Solidification structures of metallic alloys. Solidification defects.
Solid state diffusion.
Work hardening. Recovery. Reinforcing mechanisms of metals.
Equilibrium phase transformation.
Equilibrium diagrams of metallurgic interest.
Fe-C and Fe-Fe3C equilibrium diagrams.
Perlitic transformations.
Metallographic structures and microstructural analyses..
TTT curves and effect of alloying elements and grain size. CCC diagrams.
Martensitic transformations. Jominy test.
Temper embrittleness.
Preparation of metallographic samples for optical microscopy and structure recognizing.
Thermal treatments of carbon steels: annealing, normalizing; quenching and tempering.
Tempering embrittlement
Isothermal treatments.
Thermomechanical treatments.
Steels standards. Influence of alloying elements on steel properties. Carbon and alloyed steels; whethering steels.
Introduction to cast iron: classification, effect of alloying elements on microstructures and properties, mechanical properties, applications, metallographic microstructures. Didactic methods
- During the AA 2020/21 the course have been carried out by theoretical lessons by telematic streaming, due to Covid-19 problems. Lessons have been recorded.
During the AA 2021/22 the course will be held in the presence or mixed mode.
The didactic tutor, by telematic lessons, will shown the technical equipment used in the metallurgical laboratory, describing the metallographic preparation of metallic specimens. Microstructural structures of plain carbon steel and cast irons have been shown and interpretated. Learning assessment procedures
- The oral examination have the aim of evaluating the student ability to understand the relationship between the mechanical behaviour of metallic materials, the metallurgical processes and the microstructures.
Reference texts
- A.CIGADA, T.PASTORE, Struttura e proprietà dei materiali metallici, McGraw-Hill, Milano (2012).
G.M. PAOLUCCI, Metallurgia, Vol.1, Struttura, proprietà e comportamento dei materiali metallici, Ed. Libreria Progetto, Padova (2000).
G.M. PAOLUCCI, Metallurgia, Vol.2, Tecnologia dei materiali metallici, Ed. Libreria Progetto, Padova (1996).
W. NICODEMI, Metallurgia - Principi generali, Zanichelli Ed., Bologna (2000).
G.L. GARAGNANI, PDF files of the didactical transparencies
