Surface Hardening Treatments. Professor Ali Hussein ATAIWI. *There are many situations where the need for good wear or fatigue resistance for surface to a component while the requirement for a tough material with good resistance to impact failure would
Ali Hussein ATAIWI
for good wear or fatigue resistance for
surface to a component while the
requirement for a tough material with
good resistance to impact failure would
indicate the need for a soft ,ductile core .
* These requirements are accomplished by
surface hardening treatments.
and are grouped into two categories: 1-changing the composition of the surface
layers: carburizing , nitriding & cyaniding
2-selective heating of the surface layer ,i.e.
surface heat treatment :.induction
hardening ,flame hardening
alkali or alkaline earth metal carbonate
bound to hard wood charcoal or to coke
by oil, tar, or molasses .
•Barium carbonate is the principle
energizer , usually comprising about 50 to
70% of the total carbonate content. The
remainder : calicum carbonate + sodium