29773 - Metallurgy T

Learning outcomes

The primary focus of the Metallurgy T program is to provide undergraduates with a fundamental knowledge-base associated with metals-processing, their properties, and their selection and application.  The main learning objectives are: (i) how to select metallic materials for producing mechanical components working in a given service condition; (ii) how to relate their mechanical properties to the microstructure, induced by the production process and heat treatment; (iii) how to identify the reason for malfunctioning related to material features. Particular attention will be devoted to the presentation of the main microstructural, fractographic and mechanical characterization techniques for steels and light alloys.

Course contents

Requirements/Prior knowledge

No requirements/prior knowledge are required to attend with profit this course, however it is suggested to first study the Chemistry course.

Fluent spoken and written Italian is a necessary pre-requisite: all lectures and all study material are in Italian.

COURSE CONTENTS

Mechanical testing and properties: tensile, hardness, fatigue, impact, creep, friction and wear

Alloys and phase diagrams.

Solidification microstructure and defects. Nucleation and growth of pure metals and alloys. Control of the solidification microstructure. Influence of solidification microstructure and defects on the mechanical properties.

Crystal structure and imperfections in the atomic arrangement. Main crystal structures of metals and their effect on mechanical properties. Point defects and atoms movements in materials (diffusion).

Dislocations and theory of plastic deformation

Strengthening mechanisms of metals: solid solution, strain hardening, grain refinement, precipitation and dispersion.

Iron-Carbon phase diagram.

Designation and classification of steels according to EURONORM

Phase transformation in steels: ferritic, pearlitic, bainitic and martensitic phase transformation; Bain curves: TTT and CCT curves.

Heat treatments of steels: annealing, normalizing, quenching, tempering.

Thermochemical diffusion treatments of steels: carburising and nitriding.

Low carbon structural steels and engineering steels. Short introduction to cast irons and stainless steels

Wrought and casting aluminium alloys

Selection criteria of metals as a function of the in-service conditions.

Microstructural and fractographic analyses of metals

Readings/Bibliography

Course Material (slides and notes in Italian). All the slides used by the teacher are available in the AMS Campus repository.

Donald R. Askeland, P Webster "The science and engineering of materials", Chapman & Hall

W.D. Callister, “Fundamentals of Materials Science and Engineering”, J.Wiley and Sons (2001)

S. Barella, A. Gruttadauria, "Metallurgia e Materiali Non Metallici", Società Editrice Esculapio, Bologna, Seconda Edizione (2017)

G.M. Paolucci, “Appunti dalle lezioni di Metallurgia per la laurea in Ingegneria Meccanica” Vol.1-2, Edizioni Libreria Progetto, Padova

W. Nicodemi “Metallurgia - Principi generali”, Zanichelli

A. Cigada, T. Pastore "Struttura e proprietà dei materiali metallici", Mc-Graw Hill

Teaching methods

Lectures according to the timetable. All the slides used by the teacher are available in the AMS Campus repository. Visit to the metallurgy lab with practical activities.

Assessment methods

Examination in English can be arranged by previous contact with the teacher.

The final examination consists of a written test, aiming at assessing if the student learned how (i) to select metallic materials and treatments for producing mechanical components that work in a given service condition and how (ii) to identify the reasons for malfunctioning related to material features.

The written examination (during the test it is not allowed to consult notes or books, or make use of mobile phone) consists of two parts: multiple choice test (45 minutes) consisting of 30 questions, 4 options per question; and open questions (2 questions, 60 minutes). Examples of questions are available in the teaching material available in AMS Campus.

Answers to multiple choice questions will be evaluated as follows:

• +1,1 pt for each correct answer
• 0 pt for each missing answer
• -0,25 pt for each wrong answer

The final grade will be calculated as weighted average of the grade for each section, with the following weights:

• part 1 (multiple choice test) = 15
• part 2 - open question 1 = 10
• part 2 - open question 2 = 10

Teaching tools

PC and projector, blackboard. Teaching lab (equipment for metallographic preparation; optical and stereo microscopy with image analyser; scanning electron microscopy; hardness tests; tensile tests; Charpy Impact test).

Office hours

See the website of Lorella Ceschini