________ is the essential gradient of any hardened steel.
Carbon
Pearlite
Austenite
Martensite
Martensite
Martensite
is the essential gradient of any hardened steel.
Hence, the correct option is (D).
&Key Points:-
●Martensite
is a supersaturated form of carbon.
●It
has body centered tetragonal crystal structure.
●Hardness
number 700 Brinell can be achieved by martensite.
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