146) the heat treatment process used for softening hardened steel is

147) In Induction hardening ______ Is high.

148) which of the following is a case hardening process?

149) The process of inducing carbon to ______ Carbon steels in order to give it a hard surface is known as carburizing.

150) The process in which carbon and nitrogen both are absorbed by the metal surface to get it hardened is known as