|Annealing, Hardening, Tempering - Course: Working Techniques of Heat Treatment of Steel. Methodical Guide for Instructors|
Apart from models and originals of devices and auxiliary means, break samples of heat-treated workpieces are recommended as additional illustrative material. The following samples should be manufactured:
- steel of little carbon content
- steel of high carbon content
- steel having been heated too long or at a too high temperature
- steel having been heated extremely high so that it is already burned
- hardened and broken flat chisel.
Furthermore, examples for good and bad manufacture should be produced by means of the figures included in the Trainees' Handbook of Lessons". Those examples will show envisaged affects after hardening (cracks).
Existing defects should be made visible by a paint coat on a workpiece having cracks. For demonstrating the annealing colours, a table of colours including the appropriate colours is recommended which can be made as blackboards charts.