Course detail

Causes of Defects and Their Diagnostics

FSI-WPVAcad. year: 2015/2016

The basic information about physical, metallurgical and technological causes of defects of the metal materials and alloys, especially unalloyed steel, low alloy and high alloy steels, grey and white cast iron. Is given the basic information about the classification systems of the defects. The example of the classification systems of cast metals, wrought metals and welded metals - namely steels. The defects of cast and wrought steel and the defects of welded steels are explained in detail. It means that is given: - the possibilities of identification of the defect, - its technological causes, - and the possibilities of its prevention. Than are explained the following problems:
- The significance and basic principles of the statistical control of defects in the factory.
- The diagnostic of the defects by means of non-destructive method of testing.
- The problems of non-destructive testing of semi-product and final-product from different metal materials and alloy in the industry.
- The problems and main principles of quality inspection.
- The principles and using of capillary method, electrical and magnetically methods, X-ray methods, ultrasonic methods.
- And the problem: How to use the statistical and analytical methods of the identification of defects to their prevention?

Language of instruction

Czech

Number of ECTS credits

Mode of study

Not applicable.

Guarantor

doc. Ing. Libor Pantělejev, Ph.D.

Department

Institute of Materials Science and Engineering (ÚMVI)

Learning outcomes of the course unit

The course gives the possibility to obtain the knowledge: about the defects in the metallurgical processes, about the casting defects, about the defects in tempering of different materials, about the defects in welding processes – then about the systems of defect classification, about their causes, diagnostic methods and also about their prevention in different production processes and technologies.

Prerequisites

The foundation knowledge of the technological processes of iron and non-iron metals and their alloys, it means: foundation knowledge of metallurgy, foundry, welding, cutting, forming and heat treatment of metals and alloys. The foundation knowledge of processes of the physical and chemical metallurgy. The knowledge from the following regions of materials: the structure of metals and alloys, composite materials, constructional ceramics and materials for electronics. The knowledge of the mechanical, physical and technological properties of these materials. The foundation knowledge of the using and behavior of materials in the technical practice. The knowledge of mathematical-statistical tests and their applications.

Co-requisites

Not applicable.

Planned learning activities and teaching methods

The course is taught through lectures explaining the basic principles and theory of the discipline. Teaching is suplemented by practical laboratory work.

Assesment methods and criteria linked to learning outcomes

Condition for awarding the course unit credit: Having done all the assigned topics in exercises and prepared the respective written individual tasks. Examination has a written and an oral part – the student answers three questions.

Course curriculum

Not applicable.

Work placements

Not applicable.

Aims

The aim of course is following: to explain the problems of evidence, evaluation, classification, causes and prevention of material and technological defects in the material and technological processes in factories; to know the diagnostic of material defects, namely in metallurgical and another technological processes.

Specification of controlled education, way of implementation and compensation for absences

Compulsory attendance at exercises, preparing written reading a paper on an assigned topics. Absence from exercises is resolved individually.

Recommended optional programme components

Not applicable.

Prerequisites and corequisites

Not applicable.

Basic literature

ČSN 42 0015 Vady tvářených ocelových hutních výrobků: Názvosloví a třídění vad. 1968. Praha: Úřad pro normalizaci a měření, 1968. 271 s. (CS)
Elbel T., Havlíček F., Jelínek P., Levíček P., Rous J., Stránský K. Vady odlitků ze slitin železa (klasifikace, příčiny a prevence). 1. vyd. Brno: MATECS, 1992. 339 s. (CS)
Kopec Bernard a kol. Nedestruktivní zkoušení. 1. vyd. Brno:CERM, 2008, 571 s. ISBN 978-80-7204-591-4 (CS)
Mills, Kathleen Davis, Joseph R.. (1987) - 9th edition. ASM Handbook, Volume 12 - Fractography. ASM International. (EN)
Míšek B., Ptáček L. Defektoskopie a provozní diagnostika. 1. vyd. Brno: VUT v Brně, 1992. 174 s. ISBN 80-214-0425-6. (CS)

Recommended reading

Not applicable.

Classification of course in study plans

  • Programme N3901-2 Master's

    branch M-MTI , 2 year of study, summer semester, compulsory

Type of course unit

 

Lecture

26 hod., optionally

Teacher / Lecturer

prof. Ing. Rudolf Foret, CSc.
Ing. Martin Juliš, Ph.D.
doc. Ing. Libor Pantělejev, Ph.D.
doc. Ing. Alois Fiala, CSc.

Syllabus

Topics:
1) The definition of defects in technical praxis; the classification systems of defects in the production of metallic materials.
2) Basic approach to defects evaluation, prevention to defect origin. Basic defect types as geometrical defects, surface defects, inclusions, holes etc.
3) The type of defects: chemical heterogeneity, gas holes, blowholes, superficial blowholes, pinholes; their effect on the properties; causes, identification and prevention.
4) The type of defects: impurities in metals decarburisation, scaling, their effect on the properties; causes, identification and prevention.
5) The type of defects: internal stresses in metals and its alloys, fatigue of metallic materials, special defect of complex character (defect fracture included), their effect on the properties; causes, identification and prevention.
6) The type of defect: defect due to improper heat treatment, brittleness of metallic materials, cracks, their causes, identification and possibility of prevention.
7) The defects of shape, dimension and mass; wear (types, evaluation and appearance), their effect their effect on the properties; causes, identification and prevention.
8) The diagnostic of defects by means of NDT technique; methods based on capillary phenomena, magnetic and electric properties of materials, their principals, possibilities and limiting.
9) The diagnostic of defects by means of NDT technique; methods based on elastic waves interaction - acoustic methods, ultrasonic defectoscopy, acoustic emission¨.
10) The another methods of defect diagnostic; methods based on radiography, X-ray defectoscopy and other methods. Inspection (acceptance) of the material production (quality, dimensional and another inspection).