COURSE UNIT TITLE

: ENVIRONMENT-SENSITIVE CRACKING

DEGREE PROGRAMMES

Description of Individual Course Units

Course Unit Code Course Unit Title Type Of Course D U L ECTS
MME 5049 ENVIRONMENT-SENSITIVE CRACKING ELECTIVE 3 0 0 7

Offered By

Graduate School of Natural and Applied Sciences

Level of Course Unit

Second Cycle Programmes (Master's Degree)

Course Coordinator

Offered to

M.Sc. Metallurgical and Material Engineering
Metallurgical and Material Engineering
Metallurgical and Material Engineering

Course Objective

Interactions between stress and corrosive environment are dealt with in detail with respect to (a) the structure of metals, (b) types of corrosive environments, (c) the measures taken to protect corrosion, (d) the types of loading conditions and (e) variables influencing environment-related cracking. Aim is to make students aware of the consequences of environment - related failures and help them to develop a sense of understanding to assess and evaluate the failures related to the service conditions.

Learning Outcomes of the Course Unit

1   Be aware of the impact of environment-related corrosion on loss in productivity and damage to community caused by its occurrences.
2   Develop the ability to take countermeasures in preventing the occurrence of environment-related cracking and reduce the cost of consequential damage.
3   To improve students capacity of decision making in choosing the right material for the environments concerned.
4   Understand and discribe the types of environmental craking.
5   Understand how to construct tests in order to evaluate the resistivity of materials to environment-sensitive cracking.
6   Describe the relation between the microstructure and types of cracking.
7   Explain the importance of test variables on the craking mode.
8   Recognise the effect of electrochemistry on environment-sensitive cracking.

Mode of Delivery

Face -to- Face

Prerequisites and Co-requisites

None

Recomended Optional Programme Components

None

Course Contents

Week Subject Description
1 Enabling theory for environment-sensitive cracking: elasticity; stress and strain, the tensile test, concepts of linear fracture mechanics, fatigue.
2 Stress corrosion cracking (SCC): SCC mechanisms, test methods, slow strain rate test, tests by static loading on smooth and precracked samples.
3 Stress corrosion cracking (SCC): Crack initiation processes and mechanisms, crack propagation and its mechanisms, environmental factors.
4 Stress corrosion cracking (SCC): Thermodynamics of SCC, material chemistry and microstructure.
5 Stress corrosion cracking (SCC): Types of SCC: Intergranular and transgranular SCC, mechanical factors effecting SCC.
6 1st Interim Exam.
7 Corrosion fatigue cracking (CFC): Types of corrosion fatigue tests: cycles to failure tests, crack propagation test, fatigue-testing regimes.
8 Corrosion fatigue cracking (CFC): Parameters effecting CFC; stress concentration. surface effects, surface residual stress and environmental effects.
9 Corrosion fatigue cracking (CFC): Variables influencing CFC
10 Hydrogen damage: Classification of hydrogen processes; hydrogen environment embrittlement, hydrogen stress cracking.
11 Hydrogen damage: Loss in tensile ductility, hydrogen attack, blistering, hydrogen formation.
12 Hydrogen damage: Theories for hydrogen damage; pressure theory, surface adsorption theory, decohesion theory.
13 2nd Interim Exam.
14 Hydrogen damage: Enhanced plastic flow, hydrogen attack, hydrogen trapping, hydrogen damage in iron-based alloys, and hydrogen damage in nonferrous alloys.

Recomended or Required Reading

"Corrosion" by K.R. Threthewey and J. Chamberlain, Longman Group UK Limited with John Wiley&Sons, Inc., 1988

Planned Learning Activities and Teaching Methods

Oral and visual presentation, discussion and problem solving. Preperation of term assignments related to a case study involved in environment-sensitive cracking and its presentation.

Assessment Methods

SORTING NUMBER SHORT CODE LONG CODE FORMULA
1 MTE MIDTERM EXAM
2 ASG ASSIGNMENT
3 FIN FINAL EXAM
4 FCG FINAL COURSE GRADE MTE * 0.25 + ASG *0.25 +FIN *0.50
5 RST RESIT
6 FCGR FINAL COURSE GRADE (RESIT) MTE * 0.25 + ASG *0.25 +RST *0.50


*** Resit Exam is Not Administered in Institutions Where Resit is not Applicable.

Further Notes About Assessment Methods

Lecture presentation will be provided in class room in line of the course content and discussion regarding topics presented will be held. Assignment in line of appropriate subjects included in curriculum should be prepared in powerpoint and be presented in class room.

Assessment Criteria

Students performances will be assessed by exams, assignment and presentation according to the Learning Objectives LO1, LO2, LO3, LO4, LO5, LO6, LO7 and LO8.

Language of Instruction

English

Course Policies and Rules

Lecture presentation will be provided in class room in line of the course content and discussion regarding topics presented will be held. Problem solving will be presented
in relation to the appropriate subjects included in curriculum. Students are expected to follow presentation with minimum absenteeism.

Contact Details for the Lecturer(s)

Prof. Dr. Ahmet ÇAKIR
Dokuz Eylül University, Faculty of Engineering,
Metalurgical and Materials Engineering
Tınaztepe Campus, 35160 Buca / IZMIR
Tel+90 232 3017480
ahmet.cakir@deu.edu.tr

Office Hours

On Fridays btw. 10:00-11:00 am

Work Placement(s)

None

Workload Calculation

Activities Number Time (hours) Total Work Load (hours)
Lectures 12 3 36
Preparation for final exam 1 15 15
Preparation for midterm exam 2 15 30
Preparations before/after weekly lectures 12 3 36
Preparing assignments 2 20 40
Preparing presentations 2 10 20
Midterm 2 2 4
Final 1 2 2
TOTAL WORKLOAD (hours) 183

Contribution of Learning Outcomes to Programme Outcomes

PO/LOPO.1PO.2PO.3PO.4PO.5PO.6PO.7PO.8PO.9PO.10PO.11PO.12
LO.1434233
LO.2544433
LO.3444322
LO.45423443
LO.53452
LO.65333443
LO.73253
LO.8334

CONTACT INFORMATION
Dokuz Eylül Üniversitesi Cumhuriyet Bulvarı No: 144 35210 Alsancak / İZMİR
Phone: +90(232) 412 12 12 - Fax: +90 (232) 464 81 35

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