Mr. Me2, it is good to know that we rely on the same information source.
Mr. Grepper, you ask a good question concerning the significance of the temperature spikes. If the temperature spike is very limited in time and space there may be not enough heat available for martensitic phase transformation.
In some heat partitioning studies it is assumed that maximum wheel grain temperatures are quite near to the melting point of the workpiece.
A different issue are the colours we observe on the steel surface. In this case the temperature flashes may contribute to the growth of iron oxide layer, which then appears as coloured spot thanks the interference of the day light in this thin layer.
Jan
Mr. Grepper, you ask a good question concerning the significance of the temperature spikes. If the temperature spike is very limited in time and space there may be not enough heat available for martensitic phase transformation.
In some heat partitioning studies it is assumed that maximum wheel grain temperatures are quite near to the melting point of the workpiece.
A different issue are the colours we observe on the steel surface. In this case the temperature flashes may contribute to the growth of iron oxide layer, which then appears as coloured spot thanks the interference of the day light in this thin layer.
Jan