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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

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surface hardening treatments

Surface Hardening Treatments

Professor

Ali Hussein ATAIWI

slide2

*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

indicate the need for a soft ,ductile core .

* These requirements are accomplished by

surface hardening treatments.

slide3

Various methods are used for surface hardening

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

slide10

-carburizing compounds•They are reusable and contain 10 to 20

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

carbonate.