This brass specimen was deformed after the preparation. We see that the slip lines change direction as they pass the boundarys of the annealing twins.
This low-carbon steel specimen shows mechanical twins in BCC, a low temperature and/or high deformation rate phenomenon.
Several types of martensite, and characteristic phenomena of martensite formation can be observed in this image. High carbon steel.
Here we clearly can see how a phase has precipitated as a thin layer on another phase. This is typical of a peritectic reaction.
These blobs developed when a small cementite crystal dissolved and the carbon diffused out into the austenitic matrix at high temperature. At the following quenching martensite and other phases formed. The heat treatment was due to a spotweld nearby.
Here we notice the result of varying supercooling during the formation of pearlite. The precipitation has started at low temperature where the lamellae becomes fine. Then the temperature has been increased resulting in a more coarse structure. The specimen was quenched before the pearlite transformation was complete.
By adjusting the etching of the specimen we have made visible the differences in concentration of a segregating element. This also reveals the fact that this alloy has a dendritic solidification.