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Course detail
FSI-PVDAcad. year: 2025/2026
The students are familiarized with the classification and terminology of casting defects according to Czech and international standards. The basic types of defects occurring in castings are described, and the physical and chemical causes of their appearance during individual stages of the production cycle are analysed with emphasis on prevention. A number of photographs of real defects and physical samples of castings with defects are presented.
Language of instruction
Number of ECTS credits
Mode of study
Guarantor
Department
Entry knowledge
Students must have the knowledge of the thermodynamics of metallurgical processes (properties of real solutions, the criterion of the progress and equilibrium of metallurgical processes, equilibria in the melt/gas and melt/refractory systems), the technology of mould and core production (inclusive of the properties of moulding materials), casting and finishing operations in the production of castings, and the metallurgy of foundry alloys.
Rules for evaluation and completion of the course
Condition of awarding the course-unit credit: participation in exercises. Examination: the knowledge of physical-chemical a nd technological causes of the appearance of basic types of casting defects, remedial measures preventing their appearance, and basic ways of repairing them will be tested.Attendance in lectures is recommended, attendance in exercises is obligatory. Attending at the exercises is required, being checked by the leader of practicals. In the case of absence from exercises, the leader assigns a topic for independent written work.
Aims
The objective is to make students familiar with the basic types of casting defects and the main reasons for their appearance during individual production stages. They will be led to comprehend the complicated physical-chemical interactions between melts and the surrounding environment (atmosphere, foundry mould) and their effect on the quality of castings.The course will provide students with the knowledge necessary for determining the kind of casting defect, the reasons for its appearance, and taking remedial measures.
Study aids
Prerequisites and corequisites
Basic literature
Recommended reading
Classification of course in study plans
Lecture
Teacher / Lecturer
Syllabus
1. Introduction to the course, atlases of defects and standards2. Destructive and non-destructive methods of defect detection3. Defects occurring during pouring4. Thermal and mechanical loading of moulds, condensation zone, scabs5. Melt reoxidation, secondary slag, oxide skins, inclusions6. Mechanical, thermal and physical-chemical conditions of melt penetration into the mould, surface defects7. Endogenous pockets of oxygen, nitrogen, and hydrogen; pinholes8. Gas distribution in foundry mould walls, exogenous pockets9. Melt crystallization, defects in macrostructure and microstructure, segregation10. Solidification of castings, contraction cavities11. Cooling of castings, appearance of cracks12. Basic ways of repairing of castings13. Basic ways of repairing of castings
Laboratory exercise
Exercise
Computer-assisted exercise