You are going to investigate the micro-structuresof a range of metal samples and identify the material and processing history by comparing what you see with reference sources. To do this:Your tutor will provide you with a selection of ferrousand non-ferrous specimensthat have been prepared formicro-examinationand are of known origin (composition and processing history).You need to:
•Examine the surface of each specimen and make visual records of what you see. These could be hand sketches or digital images that areannotated to identify features of the grain structures such as grain boundaries, impurities, phases (for example, pearlite, ferrite in steel); and
•Compare the surface image against a datasource and identify the material and processing history(for example,cold rolled mild steel will have elongated [distorted]ferrite crystals;cold rolled mild steel followed by annealingwill have equi-axed ferrite crystals).
You then need to:Produce an organised technical reportor a log bookthat presents the findings of your micro-examinations and considers the effects of processing history and material