Crystallization of Metals and Alloys (FSI-9KKS)

Academic year 2022/2023
Supervisor: prof. Ing. Ladislav Zemčík, CSc.  
Supervising institute: ÚST all courses guaranted by this institute
Teaching language: Czech or English
Aims of the course unit:
The course objective is to make students familiar with the basic processes taking place during the crystallization of foundry alloys. Emphasis is on a purposeful control of these processes, thus leading to castings of required structure and properties.
Learning outcomes and competences:
Students will have acquired information about the crystallization process of foundry alloys and a grasp of the current possibilities of controlling this process, with the aim of obtaining castings of required structure and properties.
Prerequisites:
Students must have the knowledge of the thermodynamics and kinetics of phase transformations (diffusion, phase equilibrium diagrams, phase transformations and their effect on structure and properties), and thermomechanics (stationary and non-stationary transfer of heat by conduction, internal sources).
Course contents:
In the course, students are made familiar with the theoretical foundations of metal crystallization and the relation between the structure and the properties of castings. Models of the nucleation phase of crystallization and the phase of growth form the necessary basis for a purposeful crystallization control of castings.
Teaching methods and criteria:
The course is taught through tuition explaining the basic principles and theory of the discipline.
Assesment methods and criteria linked to learning outcomes:
The examination consists of a written and an oral part. In the written part the knowledge of sets of topics is tested, which the students were made familiar with in lectures. The oral part serves to test individual items of knowledge and to provide for correct marking.
Controlled participation in lessons:
 
Type of course unit:
    Lecture  10 × 2 hrs. optionally                  
Course curriculum:
    Lecture 1. Thermodynamics of crystallization.
2. Three distinct zones with different grain structures in the macrostructure of castings, a survey of the theories explaining their appearance.
3. The nucleation phase of crystallization, nucleation rate, model of homogeneous nucleation, heterogeneous nucleation on a planar substrate.
4. Models of heterogeneous nucleation in the cavities of refractories.
5. The phase of crystal growth, heat transport at the interface and in the mould/casting system.
6. Transport of mass at the interface, appearance of segregation
7. Constitutional supercooling, morphology of phase interface.
8. Control of metal crystallization, dynamic methods, melt modification.
9. Crystallization control in the phase of crystal growth, single crystals.
10. Crystallization of the basic types of foundry alloys.
Literature - fundamental:
1. Flemings, M.C.: Solidification Processing. 1st ed. New York: McGraw-Hill Book Company. 1974
2. Nobuo Sano ed.: Advanced Physical Chemistry for Process Metallurgy. 1st ed. San Diego: Academic Press. 1997
3. Karlsson, L.: Modeling in Welding, Hot Powder Forming and Casting. 1st ed. Materials Park, Ohio: ASM International. 1997
5. Stefanescu, D.M.:Science and Engineering of Casting Solidification. 1st ed. New York: Kluwer Academic/Plenum Publishers. 2002
The study programmes with the given course:
Programme Study form Branch Spec. Final classification   Course-unit credits     Obligation     Level     Year     Semester  
D-STG-K combined study --- no specialisation -- DrEx 0 Recommended course 3 1 W
D-STG-P full-time study --- no specialisation -- DrEx 0 Recommended course 3 1 W