Which heat-treating operation would be performed when the surface of the metal is changed chemically by introducing a high carbide or nitride content?

Case-hardening

Explanation:

Case-hardening

It is the process of hardening the surface of the metal object and allowing the metal which is deep inside to remain soft , hence , making a thin hard outer layer on the surface .

In case of iron which have low carbon content , the case - hardening is done by introducing high carbide or nitride content .

The process of case - hardening is done , in the final shaping process .

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the atomic number of carbon is six, which means that a carbon atom has six protons. carbon has three naturally occurring isotopes: carbon-12, carbon-13, and carbon-14. which of these statements are true about carbon and its isotopes? select all that appl