When a low carbon steel is undergoing heat treatment for the purposes of casehardening, what is the process that distinguishes this procedure from other hardening methods?
• Casehardening adds a hard surface while keeping a softer, tougher core. • Think about the role of carbon in changing the surface hardness of low carbon steel. • The meaning of critical temperature vs melting temperature in heat treatment.
• Which option actually changes the surface carbon content rather than just changing the internal structure by heating and cooling? • In proper casehardening, do we want to fully melt the steel, or only heat it enough to change its structure and allow carbon to diffuse? • Which cooling method is typical for getting a very hard outer layer on a low carbon steel part?
• Verify which choices involve heating above the critical temperature but below the melting temperature. • Check which method would realistically allow carbon to enter the surface of a low carbon steel part. • Eliminate any option that describes a process that would melt the steel or ignores the role of carbon diffusion at the surface.
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