Materials I

Code:

EM0022

Acronym:

MCM I

Keywords
Classification	Keyword
OFICIAL	Materials

Instance: 2011/2012 - 2S

Active?	Yes
Responsible unit:	Materials and Technological Processes Group
Course/CS Responsible:	Master in Mechanical Engineering

Cycles of Study/Courses

Acronym	No. of Students	Study Plan	Curricular Years	Credits UCN	Credits ECTS	Contact hours	Total Time
MIEM	209	Syllabus since 2006/2007	2	-	6	56	160

Teaching language

Portuguese

Objectives

To be acquainted with the mechanic properties of metallic alloys and the way to obtain them through an adequate selection of materials and/or thermal, mechanical and thermo chemical treatments.

By the end of the first five weeks of the course, students should:
1. Be acquainted with steel microstructures and cast iron, and relate them with chemical composition and cooling velocities on the various heat treatments.
2. Be able to relate microstructures with mechanic properties: resistance, ductility and tenacity

By the end of the semester, students should:
3- be acquainted with the nomenclature and objectives of the metal alloys and thermal treatments;
4- be able to discuss steel, cast iron and non-ferrous alloys selection based on the mechanical properties depending on the function of chemical composition;
5- be able to understand thermal treatments for pre-defined objectives;
6- be able to foresee the need of material, coatings, superficial chemical and thermo chemical treatments selection, taking into account the resistance to corrosion, unproblematic production and recyclability

Program

IRON-CARBON ALLOYS

1 - The Iron-Carbon equilibrium diagram
1.1 Allotropic forms of Iron
1.2 Phases and structures within the iron-iron carbide equilibrium diagram
1.3 Effect of alloying elements on critical points and lines of Fe-C diagram

2 - Austenite Isothermal and Continuous Cooling Transformation Diagrams
2.1 Effect of alloying elements
2.2 Effect of austenitizing conditions

3 - Martensitic reactions. Concept of hardenability
4 - Heat Treatments for steels
5 - Construction Steels
5.1 Wrought plain carbon steels. Mechanical properties. Heat Treatments.
5.2 Alloy steels. Mechanical properties. Heat Treatments
5.3 Classification of steels based upon:
i) Chemical Composition
ii) Use
5.4 Thermochemical treatments: carburizing, nitridind and carbonitriding.

6 - Tool Steels
6.1 Classification of tool steels adopted by AISI-SAE
6.2 Hardness and hardenability in tool stteels
6.3 Importance of austenitizing temperature in tool steels
6.4 Cold and Hot work tool steels.
6.5 High speed tool steels. Heat treatments. Residual austenite evolution during tempering


7 - Stainless Steels
7.1 Structural types: ferritic, austenitic and martensitic types
7.2 Types of corrosion in stainless steels: galvanic, pitting and intergranular corrosion
7.3 Heat treatments in stainless steels
7.4 Mechanical Properties at low and high temperatures

8 - Precipitation-hardening steels
8.1 Heat treatments of maraging steels
8.2 Mechanical properties. Advantages and limitations.

9 - Cast Irons. Introduction. Types of cast iron.
9.1 Factors affecting graphite formation both in solid and liquid state
9.2 Grey cast irons. Importance of inoculation. Effects of matrix type and graphite form on mechanical properties.
9.3 Ductile cast irons. Importance of nodulizing. Mechanical properties of ductile cast irons
9.4 Malleable cast irons. Heat treatments and properties for malleable cast irons

NON-FERROUS ALLOYS
10 - Copper alloys
10.1 Properties of pure copper
10.2 Copper- Zinc alloys: brasses. Structural types and mechanical properties
i) Monophasic alloys
ii) Biphasic alloys
10.3 Specific corrosion problems in brasses
10.4 Copper-Tin alloys: bronzes
i) Types of bronzes
ii) The importance of bronzes as anti-friction alloys

11 - Aluminium alloys
11.1 Non and Heat-treatable alloys
11.2 Precipitation hardening for the Aluminium alloys
11.3 Cast Aluminium alloys.

12 - Zinc alloys. Magnesium alloys. Types and mechanical properties. Heat Treatments
13 - Titanium alloys. Stuctural types. Mechanical properties and heat treatments. Shape memory alloys.

Mandatory literature

Askeland, Donald R.; The science and engineering of materials. ISBN: 0-7487-4083-X
Soares, Pinto; Aços
Smith, William F.; Principios de ciência e engenharia dos materiais. ISBN: 972-8298-68-4

Complementary Bibliography

Rauter, R.O.; Aços de Ferramentas, Livros Técnicos e Científicos Ed, Rio de Janeiro, 1994
Stahlschlussel, Verlag Stahlschlussel, 210

Teaching methods and learning activities

Students will attend theoretical classes and laboratory classes. Here, they are supposed
to do study a metallic alloy . The basic steps of this will be:
1-Bibliography survey of properties for studied metallic alloy
2-Comparison of each alloy with alloys of other groups
3-Experimental study about the influence of some heat treatments on the mechanical behaviour of the studied alloy

Evaluation Type

Distributed evaluation with final exam

Assessment Components

Description	Type	Time (hours)	Weight (%)	End date
Attendance (estimated)	Participação presencial	70,00
Experimental work	Trabalho escrito	40,00		2012-05-23
Exam	Exame	2,00		2012-07-13
	Total:	-	0,00

Amount of time allocated to each course unit

Description	Type	Time (hours)	End date
Study	Estudo autónomo	50	2012-07-13
	Total:	50,00

Eligibility for exams

Presence of at least 75% of laboratory classes is mandatory to final exam admission

Calculation formula of final grade

Report on experimental study (30%) + final exam (70%)

Special assessment (TE, DA, ...)

Students with a special status can either do or not the practical assignment, so:
1- If students do it, it will worth 30% of the final mark
2- Or then can only attend the final exam, which will worth 100% of the final mark

Classification improvement

An exam (100%)

Observations

Students who attend classes in the previous year and did the practical assignment can either:
1. attend classes again and do another practical assignment
2. or attend to the final exam and the practical assignment will be taken into account in the final mark. The practical assignment will be valid for a year.

The practical assignment grade includes: students’ assiduity, class work, mini-tests and the report and discussion of the assignment.