When successfully completing the course, students will be in position to:
• Know the whole range of heat treatments of metals and alloys.
• Understand the martensitic transformation and its properties.
• Read and make calculations with ΤΤΤ and CCΤ diagrams.
• Select the heat treatment depending on the alloying elements and the expected properties.
• Assess the effect of the heat treatment on the mechanical properties of metals and alloys.
• Select the best surface treatment of metals and alloys, depending on the application to be used.
• Conduct heat treatments employing appropriate equipment.
Course Content (Syllabus)
Phase transformations in solid state. Annealing (full, partial, normalizing, tempering, recrystallization, stress-relieving). Martensitic transformation. Crystal structure, morphology and kinetics of the martensite transformation. Quenching. Effect of alloying elements. CCT and TTT diagrams. Means of quenching and cracking stresses. Tempering of simple and alloyed steels. Μartempering, austenepering, patenting.
Hardening by ageing. Thermodynamics of precipitation. Structural changes during ageing. The role of alloying elements. Applications in aluminium alloys.
Surface treatments. Metal plating (electrolytic, hot-dip). Diffusion metal plating (vacuum deposition, vapor deposition, metal sprey). Structure of diffusion metal plating. Induction hardening and flame hardening. Thermochemical treatment. Flame carburizing. Carburizing, nitriding, carbonitriding, ion implantation. Galvanazing, chromizing, anodizing, phosphating.
Stainless steels. Ferritic, austenitic, martensitic hardening mechanisms and mechanical properties.
Students are evaluated with a written exam, covering the spectrum of the course field. The critical thinking, as well as the level of understanding the course are examined by theoretical questions, multiple choice and exercises in a percentile proportion of approx. 20, 20, 20%, respectively. The rest 40% concerns the evaluation of the laboratory performance of students. Among the evaluation criteria are included the participation in the labs, the quality of the produced results, as well as the quality and soundness of the technical report.