In my search for info on knife steel and how it works I stumbled across this interesting link. I like it's technical explanations and great illustrations. It is 10 pages of very basic steel information important to any knife maker, IMHO.
http://rabi.phys.virginia.edu/HTW/supplements/knives_and_steel.pdf
http://rabi.phys.virginia.edu/HTW/supplements/knives_and_steel.pdf